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Introduction to DB2 ISNULL

DB2 ISNULL is used to handle the NULL values that might be present in the data or list of values that are specified. When the data is stored in DB2 RDBMS, we use the tables and store the data in rows and columns format. If the NOT NULL constraint on the column is not applied, then the default value that gets inserted in those columns when not specified is the NULL value. While retrieving and displaying the data to the user, it is not good to display the NULL values of certain columns. In that case, we can use the ISNULL function in DB2, which will help us get the first non NULL value from the list of the parameters specified while using it.

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Syntax:

The syntax of the ISNULL function in DB2 is as given below:

ISNULL(expr1,expr2)

In the above syntax, the expr1 is the expression that can be any constant value of even the column’s name whose value you wish to retrieve and check if it contains a NULL value in it.

Expr2 is the value we want to replace the expr1 column if the expr1 contains a NULL value. If the expression evaluates to non-null value first, then the expr2 value is considered the resultant and returned as an output.

Examples of DB2 ISNULL

Given below are the examples of DB2 ISNULL:

Let us firstly consider the use of ISNULL function with the values (NULL, ‘EDUCBA’)

Code:

SELECT ISNULL (NULL, 'EDUCBA');

The execution of the above query statement gives the following output as the resultant and gives out the first non-null value from the list of specified values in the ISNULL parameters.

Output:

Now, consider that we remove the NULL value from the first place and place the NULL value in the second place. So, the first non-null value from the two parameters will be EDUCBA. Hence, the execution of the following query statement gives out EDUCBA as the output.

Code:

SELECT ISNULL('EDUCBA', NULL);

The output of the above query statement’s execution is as shown in the below image, which is the same as the previous, one but in this case, the ISNULL function doesn’t go for substituting the expr1 with expr2 for output.

Output:

Passing NULL values in both parameters.

If we supply all the parameters as NULL, then it gives out no error without any output. The ISNULL function goes for searching the first non- NULL value and fails in finding the same. Hence it returns no output as the first expression is NULL, and the value with which the expr1 is to replace in case of NULL that is expr2 is also NULL.

Code:

SELECT ISNULL(NULL, NULL);

Execution of the above statement gives the following output shown in the image.

Output:

Use of ISNULL function for substituting the NULL values stored in columns of a table.

If we retrieve the data of the table sales_customers from the database right now by using the following query statement.

Code:

SELECT * FROM [Sales_Customers];

Execution of the above statement gives the following result with all the values of the column purchase_date having the value NULL for store_id column having the value of FRUITS in it as shown below.

Output:

If we have to replace the value of NULL in the purchase_date column, then we can do that by using the ISNULL function by giving the first argument as the name of the column of purchase_date and then the second argument can be any non-NULL value with which we want to replace the NULL value with. The ISNULL function will go for searching the first non-NULL value; if the column has any date stored in it, then it displays that date else, it goes further to replace that null value stored in the column with the value specified in the second parameter. Suppose that we have to show the default date as “21-03-2023”. We can then use the ISNULL function while retrieving the values of the table by using the following SELECT query statement.

Code:

SELECT customer_id, f_name , email_id , mobile_number , purchase_date , store_id , bill_amount , ISNULL(purchase_date,"21-03-2023") FROM [Sales_Customers];

The output of the above query statement is shown below with replacing the values of the purchase date column with null values with the date that we have specified in the last value retrieved in the select query.

Output:

We can also make the use of the ISNULL function to replace the column value having NULL in it with some other column value by specifying the column containing NULL values as the first argument and the column with which the value needs to be replaced in the second argument.

Code:

)

The data of the table is as shown below:

Code:

SELECT * FROM [workers]

Output:

Using the following query statement, we can display the column address2 value in address1 place if it is NULL, as shown below.

Code:

SELECT employee_id,f_name, email_id, salary, ISNULL(address1,address2) FROM [workers]

Output:

Conclusion

We can use the ISNULL function to handle the NULL values present in the columns of the table or present as literal values. The only difference between ISNULL and COALESCE function is that ISNULL accepts only two parameters while COALESCE accepts the list of expressions for searching a non-NULL value in it.

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A Quick Glance On Mariadb Insert

Introduction to MariaDB insert

MariaDB is one of the world-famous open source database systems. MariaDB works similar to MySQL, which means most of the statements are similar to MySQL, in which that insert statement is similar in MySQL and MariaDB. The insert statement is used to insert records or insert new rows into the table. With the help of an insert statement or command, we can insert a single row or multiple rows at a time, and it comes under the data manipulation command category. When we insert a record into the table by using an insert statement, then we must insert a value for every not null column. We can delete the column from the insert statement if the column allows null values.

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Syntax of MariaDB insert

For single-row insertion operation.

insert into table name (colm_name_1 , colm_name_2,….. colm_name_N) values (statement 1, statement 2,…..statement N), (statement 1, statement 2,…..statement N),………;

Explanation:

insert into: The insert into command is used to insert records into the specified table.

table name: Table name means an actual table that we need to insert new records.

column name: It is a specified column name from the table to insert the values.

statement: Statement is used to assign the values to the column in the table, so column name 1 is assigned values of statement 1; similarly, we consider all statements.

The syntax for multiple row insertion operation by using sub select statement in MariaDB.

insert into table name (colm_name_1 , colm_name_2,….. colm_name_N) select statement 1, statement 2 from source table name [Where condition]

Explanation:

Basically, this statement is useful when we insert records from another table.

Some of the parameters are similar like the first syntax here; some parameters are added as follows:

source table name: Source Table Name means we can insert records from another table that table name means source table name.

where condition: Where condition is an optional part of this syntax, but when we use where condition in a statement that must be stratified insert condition.

How does insert Statement Works in MariaDB?

Basically, insert statement allows us to add new records into the existing table by using the above syntax. Normally syntax of insert statement followed by the table name, after that column name and values this is a simple structure of insert statement.

Let’s see how to insert a statement in MariaDB as follows:

Insert statement uses single or double quotes for the string value.

If we want to skip column name from the column list, then we must ensure that the skip column has a default value; otherwise, an error will occur.

In MariaDB, we use the following expression when we skip column name from column list at the time of insert operation.

The column name has an auto_increment property for the next sequential integer.

Sometimes column names have a default value.

If the value is NULL, then a column is a null column.

Examples of MariaDB insert

Let’s see how MariaDB insert statements work with the help of an example as follows:

For insertion operation, we need a table to create a table by using the following statement as follows.

Code:

create table emp( emp_id int auto_increment, emp_name varchar(255) not null, emp_dept varchar(255) not null, emp_address varchar(255) not null, primary key(emp_id) );

Explanation:

With the help of the above statement, we created emp with different parameters such as emp_id, emp_name, emp_dept, emp_address with different data types as shown in the above statement. Here we assign emp_id as the primary key. The result of the above statement we illustrate by using the following snapshot.

Output:

Now we can insert records into the emp table by using the following statement as follows.

Insert into emp(emp_name, emp_dept, emp_address) values ("John", "Mech", "Mumbai"); select * from emp;

Explanation:

With the help of a statement, we inserted a single row into the emp table; see in this example, we only inserted one row. The result of the above statement we illustrate by using the following snapshot.

Output:

Now let’s see how we can insert multiple rows by using insert into a statement as follows.

Code:

Insert into emp(emp_name, emp_dept, emp_address) values ("Jenny", "Comp", "Londan"), ("Sam", "Account", "Mumbai") ; select * from emp;

Explanation:

In the above example, we insert two rows at a time as shown in the above statement; here, we inserted two records into the emp table with different values. The result of the above statement we illustrate by using the following snapshot.

Output:

We have another table name as a customer with different attributes such as cust_id, cust_name cust_dept and cust_address. Now we need to insert a record from the emp table to the customer by using the following statement.

Code:

select emp_name, emp_dept, emp_address from emp where emp_id=1; insert into customer (cust_id, cust_name, cust_dept, cust_address) select 1, emp_name, emp_dept, emp_address from emp where emp_id=1;

Explanation:

In the above example, we combine select and insert statements as shown in the above statement. The result of the above statement we illustrate by using the following snapshot.

Output:

Code:

select * from customer;

Output:

Rules and Regulation for Using the insert Statement

Basically, every time we cannot insert a value for a single column, some column we left as blank and provides a default value.

In some cases, columns automatically generate their own value; in this case, there is no need to try and insert our own values.

In insert statements, we always match the order of values and column, data type and number.

If the value of the column is string, data, time or character, at that time, we need to enclose them in single quotes, and if the value of character is number or integer, then there is no need to quote.

If we don’t want to insert values into the column list, we must insert values into all columns into the table and maintain the order of values.

Conclusion

From the above article, we saw the basic syntax of MariaDB insert statements, and we also saw different examples of insert statements. We also saw the rules of MariaDB insert statements. From this article, we saw how and when we use MariaDB insert statements.

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A Quick Glance On Krita Shortcuts

Introduction to Krita Shortcuts Different Krita Shortcuts

Krita has several types of shortcut keys for a different type of commands which you can use according to your requirement.

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Default Foreground/Background Color (D): For the default foreground color, which is the black color or for the default background color, which is the white color, you can press the D button of the keyboard.

Switch Between FG to BG color (X): If you want to switch between the foreground color and background color, then you can press the X button on the keyboard.

Set Eraser Mode (E): You can set eraser mode for erasing any element or component of your art work, and for that, you can press the E button on the keyboard.

Horizontal Mirror Tool (M): If you want to use a mirror tool for mirroring any object, then just select that object and press the M button on the keyboard.

Rotate Canvas (4/5/6): For rotating canvas 15 degrees left, press 4 (numeric key of a keyboard), rotating canvas 15 degrees right, press 6 and for resetting canvas rotation, press 5.

Zoom In/Out (+/-): Press + key of a keyboard for Zoom In and – key of a keyboard for Zoom Out.

Set Zoom (1/2/3): If you want to set the zoom to the original size of your Canvas which is 100% size, then press 1 (numeric key of the keyboard), for fitting zoom to page size, press 2 and for fitting zoom according to page width press 3.

Invert Color (Ctrl +I): For inverting color of your selected layer or object, you can press Ctrl + I button after the selection of that object or layer and the color of that layer will change into the opposite color on color wheel.

Delete Everything (Del): If you want to erase everything from current layers, then select everything and press the Delete button on the keyboard.

Fill Selection With BG Color (Backspace): Press the Backspace button of the keyboard if you want to fill your selected object with the background color of color box.

Fill Selection With FG Color (Shift + Backspace): Same as background color, you can also fill foreground color into your selected object and for that, after selecting your object, press the Shift + Backspace button on the keyboard.

Show Common Colors (U): Press the U button of the keyboard for seeing common colors on the left side of the palette, and it will allow you to a quick selection of colors.

How Color History (H): If you want to see colors used in the current picture, you can press the H button on the keyboard.

Show Color Selector (I): Press the I button on a keyboard so that you can see color selector.

Some shortcut of tools of tool bar:

Free Hand Brush Tool (B): You can make active this tool by pressing the B button on the keyboard.

Move Tool (T): Press the T button of the keyboard for moving the current layer, selection or any object.

Transform (Ctrl + T): Press Ctrl + T button for transforming any layer or selection.

Crop Tool (C): Press the C button for making the crop tool active, and you can crop any layer according to your requirement

Gradient Tool (G): By pressing the G button of the keyboard, you can use the gradient tool of the tool panel and can use color between FG and BG colors for it.

Color Select Tool (P): You can press the P button for having color select so that you can select your desired color from the desired place of image or object. You can also hold the Ctrl key of the keyboard for going into color picker mode.

Fill Tool (F): If you want to fill your selection or current layer with the foreground color of color box and press the keyboard’s F button for making it active.

Rectangular Tool (R): It will help you in making of a rectangle or square shape, and for some other work, it is used. You can use the R button of the keyboard as a shortcut key of it.

Elliptical Selection Tool (J): For the elliptical selection tool, you can press the J button on the keyboard.

Select Layer (Page Up/Page Down): For selecting the next layer in the layer panel, press the Page Up button of the keyboard and select the previous layer in the layer panel and press the Page Down button of the keyboard.

Move-In Layer Panel (Home/End): For going to the first layer in the layer panel, press the Home button of the keyboard and in opposite to it for going to the last layer in the layer panel, press the End button of the keyboard.

Move Layer (Ctrl + Page Up/ Ctrl +Page Down): You can move a current layer to the down by pressing the Ctrl + Page Down button of the keyboard and by pressing Ctrl + Page Up button of the keyboard, you can move the selected layer upward.

Move Layer Into Group (G): When there are many layers in the layer panel, we make a group of them for our suitability, and you can move any layer into your desired group. Just select that layer and press the Ctrl + G button on the keyboard.

Conclusion

Now you know enough shortcut of Krita software, which will help you increase your working efficiency during working with this software.

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A Quick Glance On Linq Join With Types

Introduction to LINQ Join

LINQ Join operator is used to join two or more data sources together based on the common field between them and retrieving the matched records from the collection based on the particular conditions. Thus, it is fetching the data from two or more data sources based on the similar properties that appear in the data sources. Thus, the functionality of the operator is similar to SQL Joins.

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LINQ Join Types

LINQ Join operates on two or more data sources; in other words, you can say as inner collection and outer collection from those both collection it returns a new collection it contains the records/data from both collections.

Syntax of LINQ Join:

The above syntax contains two overloaded methods to execute the join methods; it contains the comparer as an additional argument.

When working with LINQ Join, we must understand the five things.

Outer data source.

Inner data source.

Outer key selector can able to see the common key in the outer data source.

Inner key selector can able to see the common key in the inner data source.

Result selector to retrieve the data into the resultant set.

In LINQ Join, there are several types; let’s see the types of joins with their syntax with some examples.

1. INNER Join

Inner join is used to retrieve the matching records from both the data sources based on the specific conditions, and the non-matching will be eliminated from the resultant set.

Syntax:

Var _innerJoin=dataSource_1.getRecords_1 () .join(dataSource_2.getRecords_2() { _name=data.Name, .... }).ToList(); 2. LEFT Join

Left Join retrieves the records from the left collection and only the matching records from the right collection.

Syntax:

Var Left_Join= dataSource_1.getRecords_1 () .GroupJoin(dataSource_2.getRecords_2(), { data1,data2 { ........ }); 3. CROSS Join

Syntax:

Var Cross_Join=data1.records2() . Join(data2.records2(), { .. }); 4. GROUP Join

Group Join works similar to the join operator, whereas Group Join retrieves the result in groups based on a specific group key. Group Join performs the joining of two collections based on key and groups by the matching key and finally returns the collection of grouped key and result.

Syntax:

Var Group_Join=data1.records1() .GroupJoin( data2.records2(), ); Example of LINQ Join

Below is the example mentioned:

Code:

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace Console_LinQJoins { class Program { public class EmployeeClass_Master { public int Emp_ID { get; set; } public string Emp_Name { get; set; } public string Emp_Qualification { get; set; } public int Emp_DeptID { get; set; } } public class DepartmentClass_Master { public int Dept_ID { get; set; } public int Emp_ID { get; set; } public string emp_DeptName { get; set; } public int Emp_Salary { get; set; } } class Linq_Joins_ProgramClass { static public void Main() { new EmployeeClass_Master() {Emp_ID = 1000, Emp_Name = "Richard", Emp_Qualification = "MCA",Emp_DeptID=101}, new EmployeeClass_Master() {Emp_ID = 1005, Emp_Name = "Ricky", Emp_Qualification = "B.E",Emp_DeptID=103}, new EmployeeClass_Master() {Emp_ID = 1001, Emp_Name = "Jack", Emp_Qualification = "MCA",Emp_DeptID=101}, new EmployeeClass_Master() {Emp_ID = 1007, Emp_Name = "Ponting", Emp_Qualification = "B.E",Emp_DeptID=102}, new EmployeeClass_Master() {Emp_ID = 1003, Emp_Name = "Paul", Emp_Qualification = "M.Sc",Emp_DeptID=102}, new EmployeeClass_Master() {Emp_ID = 1004, Emp_Name = "Beeja", Emp_Qualification = "B.E",Emp_DeptID=103}, }; { new DepartmentClass_Master() {Dept_ID=101,Emp_ID = 1000, emp_DeptName = "Graphical-Designing", Emp_Salary = 60000}, new DepartmentClass_Master() {Dept_ID=102,Emp_ID = 1001, emp_DeptName = "Development", Emp_Salary = 35000}, new DepartmentClass_Master() {Dept_ID=103,Emp_ID = 1002, emp_DeptName = "Admin", Emp_Salary = 45000}, }; var res_CrossJoin = empDetails .Join(deptDetails, { Name = emp.Emp_Name, dName = dept.emp_DeptName } ); var res_GroupJoin = deptDetails. GroupJoin( empDetails, ); Console.WriteLine("nnLINQ Group Join"); foreach (var item in res_GroupJoin) { Console.WriteLine("ntDepartment Name :" + item.dept.emp_DeptName+"n"); foreach (var employee in item.emp) { Console.WriteLine("ttEmployeeID : " + employee.Emp_ID + " , Name : " + employee.Emp_Name); } } Console.WriteLine("nLINQ Cross Join"); Console.WriteLine("tEmployee NametDepartment Namesn"); foreach (var data in res_CrossJoin) { Console.WriteLine("nt{0}tt{1}", data.Name, data.dName); } Console.ReadLine(); } } } }

In this output, we can’t see the Employee Name “Paul” because this employee does not belong to any department.

Output:

In the above sample program, we used Group join and Cross join. In cross join, we need to map each element in the first collection with each element in the second collection, so cross join is nothing but it produces the Cartesian products of the collection. For example, in the above code, the first list of collections contains 6 elements, and the second collection contains 3 elements, so finally, the resultant collection will be (6*3) totally of 18 elements.

Conclusion

In this article, we well-read about LINQ Joins, which are used to return the collection of elements based on given conditions using joins. Using several types of join methods, we can easily retrieve our records in the desired way based on several criteria.

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A Quick Glance Of Jquery Slider With Programming Example

Introduction to jQuery Slider

A slider is something which is generally used when we want to select a numeric value from a certain range. This can be achieved by simply dragging a slider. jQuery UI offers a slider() method to achieve the sliding effect in the web pages. slider() method basically changes the appearance of HTML elements in the page and give them the proper styling by adding certain new CSS classes. Benefit of using a slider over a text input is any value selected by the user is valid without leaving any chance of selecting an invalid value.

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Syntax of jQuery Slider $(selector, context).slider(options);

Where, options refer to an object specifying appearance and behavior of the slider. More than one options can be used at a time using a JavaScript object. In such a case, options can be separated using a comma as shown below.

$(selector, context).slider({option1:value1, option2:value2……..});

slider(options): specifies that an HTML element should be managed as a slider.

Note: Some of the options which can be used with the slider() method are as follows:

animate, disabled, max, min, orientation, range, step, value, values.

$(selector, context).slider("action", params);

This method enables an action on the slider, for example, to move the cursor to a new location. Here, action is referenced by a string and is passed to the method as the first argument.

Note: Options which can be used with slider() method are as follows

destroy, disable, enable, option, option(optionName), option(optionName, valyue), option(options), value, value(value), values, values(index), values(index, value), values(values), widget.

Examples of jQuery Slider

Given below are the examples mentioned:

Example #1

Following example is a simple illustration of slider functionality where no parameter is passed to the slider() method.

Code:

Output

Below screenshot is taken of the screen which displays when the above code is executed for the very first time.

A horizontal slider with a single handle can be seen which is moved with the mouse or using the arrows keys.

Example #2

Here is an another example showing the usage of options, value, animate and orientation with the slider() method.

Code:

Output:

In this example, the slider value is set as 50 initially, so the handle is a seen at value 50.

Example #3

Here is an another simple example showing the usage of options, range, min, max and values with the slider() method.

Code:

Output:

In the given example, we see a range of numbers getting displayed which is indicated by the space between the handles.

This space is filled in with a different color to mark the values selected.

As you move the handle the range getting displayed keeps on changing as well.

Example #4

This example illustrates the usage of event method with slider functionality.

Code:

Output:

In the given example, we see the usage of an event method with the slider which gets triggered for a particular event. Here, we have used start, stop , change and slide event methods.

As we move the handles, we see the changes.

Conclusion

In this article, we saw about the jQuery UI slider functionality which is basically used to pick a numeric value within a given range. The key benefit of using this functionality is that, each and every value you select using the slider is a valid one which is not always the case with the text input.

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Architecture Of Db2 With Brief Explanation

Introduction to DB2 Architecture

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Architecture of DB2

The architecture of DB2 are given below:

1. DB2 Client

The DB2 clients can be either remote application or local applications each of which is linked internally with the client library of DB2. The communication between client and server is made by using different techniques. If the client is local then semaphores and shared memory are used for communication. In the case of remote clients, the communication is carried out by using different protocols like TCP/ IP or named pipes which are also denoted as NPIPE.

2. DB2 Server

The DB2 server consists of different components in which all the activities are controlled by the units called Engine Dispatchable Units that is EDUs. We can observe different components of the DB2 server and the DB2 client-server communications by having a look at the below diagram –

3. Engine Dispatchable Units (EDUs) 4. Subagents

A different set of subagents is used for serving the requests from client application processes. There is a facility and possibility that we can assign multiple subagents provided if the machine which we are using for the DB2 server has multiple processors or the DB2 server internally uses a partitioned database environment. One of the examples, where we can use multiple subagents is symmetric multiprocessing(SMP) which is an environment and the multiple SMP are capable of exploiting multiple processors at the same time.

5. Pooling Algorithm

The pooling algorithm is responsible for managing the agents and subagents that are present inside the DB2 server. This algorithm helps us to minimize the destruction and construction of the EDUs inside DB2 server.

6. Buffer Pool

Buffer pools is the place where the actual data resides. These pools are the part of the memory of our database server which stores the data related to pages of a user, catalog data, and the index data temporarily. There after this data is moved to Hard disks. But initially and while manipulating the data is brought to these pools and modified and manipulated. The buffer pools are regarded as one of the key parameters for measuring the performance of the DB2 server. This is because of the fact that accessing the data from the memory of the buffer pools is much faster and simpler than accessing it from the hard disk.

How quickly can the data inside the DB2 servers can be accessed by the DB2 client side applications depends upon the configurations of the buffer pools as well as other components like page cleaners and the prefetchers.

7. Prefetchers 8. Working of Prefetchers

The client side requests are implemented by prefetchers by using the scatter-read and big-block input operations when the prefetchers become available they bring all the pages which are requested into the buffer pool from the disk. We can also strip the data across the disks provided if we have multiple disks for storing the data. The use of stripping the data helps us and enables the use of prefetchers to retrieve the data simultaneously from multiple disks.

9. Page Cleaners

The working of page cleaners is just the opposite of prefetchers. The responsibility of prefetchers is to move the data to the hard disk from the buffer pool. They work in the background of the EDUs because they are independent of the other agents of the application. The page cleaners are responsible for having the look at which pages are changed and the updated modified pages are written back to the disk. It is the responsibility of the page cleaners to make sure that the required space is available in the buffer pools for the working of the prefetchers. If there were no independent page cleaners and the prefetchers in the DB2 server then the other agents of the application would have to all the operations related to read and write between disk storage and the buffer pool.

Conclusion

The architecture of the DB2 consists of different components. The architecture of the DB2 is mainly divided into the DB2 client and DB2 server. The DB2 server consists of different agents and subagents. The two important components are the prefetchers and the page cleaners which maintain the data in buffer pools for fast and effective retrieval of data.

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