请提供有关如何优化此sql过程的建议...不存在的地方subselect是我的主要问题。有人告诉我,我可以获得40%的性能提升。
insert into #tmpTable (intID3,intID4,intID5,intID6,
StaticDate,NewDate,
[Description],Change,intSort)
select distinct
'' as intID3,
intID4,
intID5,
intID6,
@dteDate1 as StaticDate,
'' as NewDate,
'16 character str' as [Description],
0 as Movement,
0 as intSort
from #tmpTable j
where not exists (
select
1
from #tmpTable x
where
x.intID1 = j.intID1
and x.intID2 = j.intID2
and x.[Description] = '16 character str'
)
答案 0 :(得分:1)
尝试使用以下查询。
INSERT INTO #tmpTable2
(intID3,intID4,intID5,intID6,
StaticDate,NewDate,
[Description],Change,intSort)
SELECT DISTINCT
'' as intID3,
j.intID4,
j.intID5,
j.intID6,
@dteDate1 as StaticDate,
'' as NewDate,
'16 character str' as [Description],
0 as Movement,
0 as intSort
FROM #tmpTable j
LEFT JOIN #tmpTable x
ON x.intID1 = j.intID1
AND x.intID2 = j.intID2
AND x.[Description] = '16 character str'
WHERE x.intID1 IS NULL