This article explores the SQL variables using SET and Select SQL
In addition to its main usage to form the logic that is used to retrieve data from a database table or multiple tables in SQL Server the SELECT statement can be used also to assign a value to a previously created local variable directly or from a variable view or table
SELECT local variable Transact SQL SQL Server, Sets a local variable to the value of an expression For assigning variables we recommend that you use SET local variable instead of SELECT local variable Transact SQL syntax conventions Syntax syntaxsql SELECT local variable expression n Note
Variables Transact SQL SQL Server Microsoft Learn
SQL Create the table CREATE TABLE TestTable cola INT colb CHAR 3 GO SET NOCOUNT ON GO Declare the variable to be used DECLARE MyCounter INT Initialize the variable SET MyCounter 0 Test the variable to see if the loop is finished WHILE MyCounter 26 BEGIN Insert a row into the table
When to use SET vs SELECT for assigning SQL Server Variables, SET and SELECT may be used to assign values to variables through T SQL Both fulfill the task but in some scenarios unexpected results may be produced In this tip I elaborate on the considerations for choosing between the SET and SELECT methods for assigning a value to variable Solution
SET local variable Transact SQL SQL Server Microsoft Learn
SET local variable Transact SQL SQL Server Microsoft Learn, The SET statement that assigns a value to the variable returns a single value When you initialize multiple variables use a separate SET statement for each local variable You can use variables only in expressions not instead of object names or keywords To construct dynamic Transact SQL statements use EXECUTE
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Set variable result in case statement to be used again in the same
Set variable result in case statement to be used again in the same 1 Answer Sorted by 4 You need to either repeat the expression or derive it in a separate scope e g SELECT name tag CASE WHEN tag a THEN a2 ELSE b2 END AS tag2 FROM SELECT name CASE WHEN name a THEN a ELSE b END AS tag FROM dbo table name AS derived Share Improve this answer Follow edited Jan 29 2017 at 3 36
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1 DECLARE LOCAL VARIABLE data type value Now let s interpret the above syntax 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 SQL Variables Basics and usage SQL Shack. There are 2 ways of assigning a value to a local variable previously created with the DECLARE LocalVariable statement namely using the SET and the SELECT statements To illustrate DECLARE SETVariable INT SELECTVariable INT SET SETVariable 1 SELECT SELECTVariable 2 Listed below are the differences between the SET and SELECT statements Create procedure PersonSearchLastName LastNamePattern as varchar 20 AS begin select from Person Person Where LastName like LastNamePattern end exec dbo PersonSearchLastName Ral Let me run this command to create the stored procedure object within the database Now I can execute it using
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