[英]If table returns 0 rows then select another query
因为我的查询有时会返回0行,所以如果它返回0行,那么我需要选择另一个语句。
select MR.NAME as NAMES,Isnull(cast(sum(MTTR/Month(getdate())) as decimal(18,2)),0) as YTDCURRENTYEAR from #Meantimeresult as MR
where YEAR(CONVERT(DATE, '01-' + Month)) = YEAR(GETDATE()) AND MONTH(CONVERT(DATE, '01-' + Month)) <= MONTH(GETDATE())
group by MR.NAMES
第二条陈述是
Select NAME='' ,YTDCURRENTYEAR=0
IF NOT EXISTS (YOUR FIRST QUERY)
BEGIN
YOUR SECOND QUERY
END
您可以使用通用表表达式包装第一个查询,并使用union all:
WITH CTE AS
(
SELECT MR.NAME as NAMES, Isnull(cast(sum(MTTR/Month(getdate())) as decimal(18,2)),0) as YTDCURRENTYEAR
FROM #Meantimeresult as MR
WHERE YEAR(CONVERT(DATE, '01-' + Month)) = YEAR(GETDATE())
AND MONTH(CONVERT(DATE, '01-' + Month)) <= MONTH(GETDATE())
GROUP BY MR.NAMES
)
SELECT Names, YTDCURRENTYEAR
FROM CTE
UNION ALL
SELECT NAME='' ,YTDCURRENTYEAR=0
WHERE NOT EXISTS(
SELECT 1
FROM CTE
)
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