Αποτελέσματα Αναζήτησης
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. answered Nov 5, 2016 at 23:55.
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”.
SQL set operations combine the results of multiple query blocks into a single result. A query block, sometimes also known as a simple table, is any SQL statement that returns a result set, such as SELECT.MySQL 9.1 also supports TABLE and VALUES statements. See the individual descriptions of these statements elsewhere in this chapter for additional information.
The SET command is used with UPDATE to specify which columns and values that should be updated in a table. The following SQL updates the first customer (CustomerID = 1) with a new ContactName and a new City: Example. UPDATE Customers. SET ContactName = 'Alfred Schmidt', City= 'Frankfurt' WHERE CustomerID = 1;
29 Νοε 2017 · SQL Server provides us with two methods in T-SQL to assign a value to a previously created local SQL variable. The first method is the SET statement, the ANSI standard statement that is commonly used for variable value assignment. The second statement is the SELECT statement.
