What are SQL Server table variables?
Definition. The table variable is a special type of the local variable that helps to store data temporarily, similar to the temp table in SQL Server. In fact, the table variable provides all the properties of the local variable, but the local variables have some limitations, unlike temp or regular tables.
How do you DECLARE a table variable?
To declare a table variable, you use the DECLARE statement as follows:
- DECLARE @table_variable_name TABLE ( column_list );
- DECLARE @product_table TABLE ( product_name VARCHAR(MAX) NOT NULL, brand_id INT NOT NULL, list_price DEC(11,2) NOT NULL );
How do I select a table variable in SQL Server?
Insert for a Table Variable from a SQL Server Select Statement
- The first step appears in the first code block with a header comment of “declare table variable”.
- The second step in the code block is an INSERT statement that populates a table variable from the result set of a SELECT statement.
What are the variables in a table?
Table variables are the variables selected on the Table tab for display in your output tables. Table variables are displayed by their groupings. For example, the Sex variable is displayed by the three groupings ‘Male’, ‘Female’, and ‘Male and Female’.
How do you use table variables?
To declare a table variable, start the DECLARE statement. The name of table variable must start with at(@) sign. The TABLE keyword defines that used variable is a table variable. After the TABLE keyword, define column names and datatypes of the table variable in SQL Server.
How do you write a variable in SQL query?
Firstly, if we want to use a variable in SQL Server, we have to declare it. The DECLARE statement is used to declare a variable in SQL Server. In the second step, we have to specify the name of the variable. Local variable names have to start with an at (@) sign because this rule is a syntax necessity.
What is difference between temp table and table variable in SQL Server?
Temporary Tables are physically created in the tempdb database. Table Variable acts like a variable and exists for a particular batch of query execution. It gets dropped once it comes out of batch. It is created in the memory database but may be pushed out to tempdb.