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My use case was that I wanted to set a variable to a string. All the other answers here show how to set a variable using the output of a SELECT statement. Here's how to do it with a simple string: DECLARE @ModelID varchar(60) = 'Model T'
2 Ιουλ 2013 · For MySQL, please take a look this example code: -- Init variables SET @var1 = 0; SET @var2 = 0; SET @var3 = 0; SELECT VALUE1, VALUE2, VALUE3 INTO @var1, @var2, @var3 FROM COOL_TABLE WHERE VALUE_ID = 12345; -- Then you can use declared variables SELECT * FROM ANOTHER_TABLE WHERE VALUE1 = @var1 AND VALUE2 = @var2
16 Αυγ 2023 · For example, the below SQL code declares three variables @AvgUnitPrice, @AvgOrderQty, and @AvgLineTotal. The SELECT statement calculates the unit Price, Order Quantity, and Line Total average. These calculated values are assigned to the variables.
SET syntax for variable assignment enables you to assign values to different types of variables that affect the operation of the server or clients: User-defined variables. See Section 11.4, “User-Defined Variables”. Stored procedure and function parameters, and stored program local variables. See Section 15.6.4, “Variables in Stored Programs”.
29 Νοε 2022 · For example:- DECLARE @a INT; DECLARE @b INT; SET @a = 0; SET @b = 0; SELECT @a = 3, @b = 5 - @a; SELECT '@a before @b' AS Test, @a AS [Value Of @a], @b AS [Value Of @b]; SET @a = 0; SET @b = 0; SELECT @b = 5 - @a, @a = 3; SELECT '@b before @a' AS Test, @a AS [Value Of @a], @b AS [Value Of @b];
8 Ιουλ 2024 · The DECLARE statement initializes a Transact-SQL variable by: Assigning a name. The name must have a single @ as the first character. Assigning a system-supplied or user-defined data type and a length. For numeric variables, a precision and scale are also assigned. For variables of type XML, an optional schema collection might be assigned.
28 Ιουλ 2011 · DECLARE @yourvariable nvarchar (50) = '@somedomain.com'; SELECT LOWER(SUBSTRING([NAME], 4, 100)) + @yourvariable as EMail ,HashBytes('SHA1', LOWER(SUBSTRING([NAME], 4, 100)) + @yourvariable) as HashedEmail FROM sometable;
