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