[英]How to assign a NULL value with a CASE statement?
我正在尝试使用CASE语句在另一个字段为NULL时分配NULL值。
到目前为止,这是我得到的:
UPDATE PunchintervalFinal
SET INDTTIME_LUNCH = (SELECT CASE
WHEN PunchintervalFinal.INDTTIME2 IS NULL THEN
NULL
END
FROM PUNCHBRIDGE A
WHERE A.EMPLOYEE = PunchintervalFinal.EMPLOYEE
AND A.PUNCHDATE = PunchintervalFinal.PUNCHDATE
AND PunchintervalFinal.EMPLOYEE = '500018')
这应该做你想做的事情:
UPDATE PunchintervalFinal
SET INDTTIME_LUNCH = NULL
FROM PunchintervalFinal
INNER JOIN PUNCHBRIDGE A ON A.EMPLOYEE = PunchintervalFinal.EMPLOYEE
WHERE PunchintervalFinal.EMPLOYEE = '500018'
AND A.PUNCHDATE = PunchintervalFinal.PUNCHDATE
AND PunchintervalFinal.INDTTIME2 IS NULL
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