SQL Server 2008. Table variables cannot be dropped, nor can they be re-declared. The reason is very simple, you can’t just insert the data into the table variable on the fly. Yesterday I come across a strange issue while I was trying to use update query with table variable. Below figure explain two types of variable available in MS SQL server. At any point of time, the Table Variable will also contain 1000 to 3000 rows. To insert values into a table variable, uses the INSERT statement based on a SELECT statement. "A traditional table variable represents a table in the tempdb database. T-SQL supports many feature like variables, loops, conditions and exceptions. Use following queries for this: For much faster performance you can memory-optimize your table variable." I replaced the Cursor and used Table Variable. Solution 1: Define Variable Table This is a very simple solution, first, define a table variable and right after that insert the data into it. Table variable is used to store an entire result set rather than a single value. SQL Declare variable table Declare variable table. To declare a table variable, use the DECLARE keyword, then type the @variable_name and variable type table with columns. as users join Address a on a.UserID = users.UserID Transact SQL is also known as T-SQL. I want to know whether to replace Table Variable with #TempTable? Table Variable. Let us confirm this with following example: First create 2 temporary variables. The query which works fine with temporary table does not work with table variables. Table Variable acts like a variable and exists for a particular batch of query execution. In fact, trying to do the latter returns this error: “The variable name ‘@country’ has already been declared. Table Variable Table variables are also temporary objects and they are created as with DECLARE keywords. By default, a local variable starts with @. It is created in the memory database but may be pushed out to tempdb. Instead, use a declaration statement to make available a fresh table variable. Every local variable scope has the restriction to the current batch or procedure within any given session. will return Cannot find a table or object with the name “@country”. Because a table variable is a type of local variable, T-SQL scripts do not create table variables with a create table statement. Variable names must be unique within a query batch or stored procedure. Type of Variables in SQL Server Local variable: A user declares the local variable. Use Table variable, if you have less than 1000 rows otherwise go for Temporary tables. Check the system catalog. Example. When executed the update finished in 2 minutes. The data type of a column defines what value the column can hold: integer, character, money, date and time, binary, and so on. If you are doing more complex processing on temporary data, or need to use more than reasonably small amounts of data in them, then local temporary tables are likely to be a … In order to use the in-memory technology you have to explicitly define a TYPE which is memory optimized and use that TYPE to define your table variable. 1 Even if you replace the table variable with SQL, it will greatly speed up query performance: select * from (Select 10377 as UserID Union all Select 73736 Union all Select 7474748 ….) Global variable: Once you have successfully created a table variable, you can query the same table variable via following select statement. All the name of table variable in T - SQL start with at sign (@). Table variables are not in-memory constructs. There are two different solution/workaround to this problem. Table variables are SQL Server local variables, but they also have some properties that resemble temp tables. It gets dropped once it comes out of batch. 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