在 SQL 查詢中設置變量

Question

我正在嘗試設置變量，但Incorrect syntax near '='. .

    DECLARE @name NVARCHAR(100) = 'Some name'
    DECLARE @id INT
    EXECUTE ('SET ' + @id + ' = (SELECT mm.mmID FROM dbo.measurem AS mm
        WHERE mm.placeName = ''' + @name + ''')')
    PRINT @id

如果我這樣嘗試：

SET @id= (SELECT mm.mmID FROM dbo.measurem AS mm
          WHERE mm.placeName = @name)

我must declare variable @name ，盡管我將它作為我的輸入存儲過程參數。

Answer 1

對於聲明變量，您可以通過在 mysql 中聲明變量來 go但是您需要執行以下操作才能使其運行<>db-fiddle

SELECT @my_name := 'Some name';
SELECT @id;
SET @s = CONCAT (
        'Select mm.mmID into @id From measurem as mm where 
    mm.placeName='
        ,''''
        ,@my_name
        ,''''
        );
PREPARE stmt
FROM @s;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
SELECT @id;