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Table Data Type- SQL Server

      In SQL Server, the table data type is a structured data type that allows you to define a table as a variable. It can be useful in scenarios where you need to store data temporarily or pass data between stored procedures or functions. In this blog, we will explore the table data type in SQL Server and provide an example of how it can be used.

Introduction to the table data type

The table data type is a structured data type that allows you to define a table as a variable. It can be used to store data temporarily or pass data between stored procedures or functions. The table variable behaves like a regular table in SQL Server, but it is stored in memory rather than on disk.

Creating a table variable in SQL Server

To create a table variable in SQL Server, you need to declare the variable and define the table structure. The following code demonstrates how to declare a table variable and define the table structure:

DECLARE @MyTable TABLE (

    ID INT,

    Name VARCHAR(50)

);

In this example, the table variable "@MyTable" is declared and defined with two columns: "ID" and "Name".

Inserting data into a table variable

Once you have created a table variable, you can insert data into it using the INSERT INTO statement. The following code demonstrates how to insert data into a table variable:

INSERT INTO @MyTable (ID, Name)

VALUES (1, 'John'),

       (2, 'Jane'),

       (3, 'Bob');

In this example, data is inserted into the "@MyTable" table variable with three rows.

Using a table variable in SQL Server

Once you have created a table variable and inserted data into it, you can use it in SQL statements just like a regular table. The following code demonstrates how to use a table variable in a SELECT statement:

SELECT *

FROM @MyTable

WHERE ID > 1;

In this example, the SELECT statement retrieves all rows from the "@MyTable" table variable where the "ID" column is greater than 1.

Conclusion

The table data type in SQL Server is a powerful tool that allows you to define a table as a variable. It can be useful in scenarios where you need to store data temporarily or pass data between stored procedures or functions. By using a table variable, you can easily define a table structure, insert data into it, and use it in SQL statements just like a regular table.

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