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鎵懼嚭琛ˋ涓璏瀛楁澶т簬500錛孻錛堟棩鏈燂級鏃╀簬褰撳墠鏁版嵁搴撲竴澶╋紝X瀛楁鍙栧間笉閲嶅鐨勮褰曪細
select * from A where x in
(select x from A group by x having count(x)=1)
and m >500 and y < getdate()-1;
浠庤〃A涓粺璁瀛楁鐨勪笉鍚屽彇鍊兼暟騫跺彧鎶婅褰曟暟澶氫簬5鐨勬壘鍑猴細
select * from A where x in (select x from A group by x having count(x)>5)
璁捐〃B緇撴瀯涓庤〃A鐩稿悓錛屽皢B涓璶瀛楁鍊煎ぇ浜?00鐨勮褰曟彃鍏 錛?br />insert into聽A select * from聽B where n>500
瀵硅〃A錛屽緩绔嬪拰鍒犻櫎M,N瀛楁鑱斿悎鍞竴绱㈠紩錛?br />CREATE UNIQUE聽 INDEX myclumn_index ON A(x,y)
DROP INDEX A.myclumn_index聽
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