Table Variable. Type of Variables in SQL Server Local variable: A user declares the local variable. When executed the update finished in 2 minutes. Transact SQL is also known as T-SQL. Table Variable Table variables are also temporary objects and they are created as with DECLARE keywords. It gets dropped once it comes out of batch. The data type of a column defines what value the column can hold: integer, character, money, date and time, binary, and so on. At any point of time, the Table Variable will also contain 1000 to 3000 rows. 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. Table variable is used to store an entire result set rather than a single value. DECLARE statement is used to create a table variable. Variable names must be unique within a query batch or stored procedure. as users join Address a on a.UserID = users.UserID By default, a local variable starts with @. Table variables are SQL Server local variables, but they also have some properties that resemble temp tables. Example. There are two different solution/workaround to this problem. All the name of table variable in T - SQL start with at sign (@). Instead, use a declaration statement to make available a fresh table variable. T-SQL supports many feature like variables, loops, conditions and exceptions. SQL Prompt implements this recomendation as a code analysis rule, ST011 – Consider using table variable instead of temporary table. 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 ….) The reason is very simple, you can’t just insert the data into the table variable on the fly. Because a table variable is a type of local variable, T-SQL scripts do not create table variables with a create table statement. I replaced the Cursor and used Table Variable. It is created in the memory database but may be pushed out to tempdb. will return Cannot find a table or object with the name “@country”. I want to know whether to replace Table Variable with #TempTable? Use Table variable, if you have less than 1000 rows otherwise go for Temporary tables. "A traditional table variable represents a table in the tempdb database. SQL Server 2008. To insert values into a table variable, uses the INSERT statement based on a SELECT statement. Every local variable scope has the restriction to the current batch or procedure within any given session. Use following queries for this: Once you have successfully created a table variable, you can query the same table variable via following select statement. 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. 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 … 1 Server is Windows Server 2012 64-bit with 64GB RAM. SQL Declare variable table Declare variable table. In fact, trying to do the latter returns this error: “The variable name ‘@country’ has already been declared. To declare a table variable, use the DECLARE keyword, then type the @variable_name and variable type table with columns. The query which works fine with temporary table does not work with table variables. Check the system catalog. Global variable: Table variables cannot be dropped, nor can they be re-declared. For much faster performance you can memory-optimize your table variable." Yesterday I come across a strange issue while I was trying to use update query with table variable. Let us confirm this with following example: First create 2 temporary variables. 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