Question

我试图从依赖于某个字段的表中获取结果，并根据其中一个字段填充来自不同字段的变量。这就是我所拥有的

DECLARE  @MyText Text; 
SELECT 
bu4contart,
CASE WHEN bu4contart IN('40HR', '40RF') THEN
     'Temp: ' + bu4setpoint
ELSE 
     'Oversize: ' + bu4ohtop
END AS @MyText
FROM MyTable

Answer 1

您的问题是您需要来自（可能）行集的标量值。这可能适用于标量情况。

DECLARE  @MyText Text = 
(SELECT Top 1

CASE WHEN bu4contart IN('40HR', '40RF') THEN
     'Temp: ' + bu4setpoint
ELSE 
     'Oversize: ' + bu4ohtop
END AS MyText
FROM MyTable
Order By FieldThatOrdersForTop1FromMultipleRowsIfNecessary
)

Answer 2

也许这个？

DECLARE  @MyText varchar(max);
DECLARE  @sql varchar(max);

SET @MyText = 'ahahahha';

SET @sql='SELECT 
    bu4contart,
    CASE WHEN bu4contart IN(''40HR'', ''40RF'') THEN
        ''Temp: '' + bu4setpoint
    ELSE 
         ''Oversize: '' + bu4ohtop
    END AS ' + @MyText  
    + ' FROM MyTable';

EXECUTE (@sql)

在Case语句中使用变量

2 个答案: