您可以使用交叉申请
SELECT T2.[ADD],
T2.[ADD]*2,
T2.[ADD]/2
FROM @T AS T1
CROSS APPLY (SELECT T1.NUM1+T1.NUM2) AS T2([ADD])
或CTE
WITH C AS
(
SELECT NUM1+NUM2 AS [ADD]
FROM @T
)
SELECT [ADD],
[ADD]*2,
[ADD]/2
FROM C
或子查询（也称为派生表）
SELECT T.[ADD],
T.[ADD]*2,
T.[ADD]/2
FROM (
SELECT NUM1+NUM2 AS [ADD]
FROM @T
) AS T
不能在声明的同一字段列表中使用列别名。
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