导读:1建站知识因为在FOR .. IN () LOOP 游标中使用 所以不能采用下面的查询语句做游标如何seo优化推广网站seo网站优化。

复制代码 代码如下:

select a.f_username from ( SELECT /*+parallel(gu,4)*/distinct gu.f_username FROM t_base_succprouser gu where gu.f_expectenddate > (select trunc(sysdate,'Y')FROM DUAL) and gu.f_lotid=1 and gu.f_playid=4 and gu.f_paymoney>=1500 ) A left join ( select from t_base_vip_customes and ((vu.f_passeddate is null ) or (vu.f_passeddate > trunc(sysdate,'Y') )) and ((vu.f_lotid is null ) or (vu.f_lotid=1)) and ((vu.f_playid is null ) or (vu.f_playid=4)) and ((vu.f_condtionid is null ) or (vu.f_condtionid=3)) )B on A.f_username=B.f_usernam where b.f_username is null

采用下面的语句 只能查出部分用户

复制代码 代码如下:

SELECT /*+parallel(gu,4)*/distinct gu.f_username FROM t_base_succprouser gu left join t_base_vip_customes VU on gu.f_username=vu.f_username gu.f_expectenddate > (select trun网站建设c(sysdate,'Y')FROM DUAL) and gu.f_lotid=rec_viplotplay.f_lotid and gu.f_playid=rec_viplotPlay.f_Playid and gu.f_paymoney>=rec_viplotPlay.F_Conditon_ValuesA and ((vu.f_passeddate is null ) or (vu.f_passeddate > trunc(sysdate,'Y') )) and ((vu.f_lotid is null ) or (vu.f_lotid=rec_viplotplay.f_lotid)) and ((vu.f_playid is null ) or (vu.f_playid=rec_viplotPlay.f_Playid)) and ((vu.f_condtionid is null ) or (vu.f_condtionid=rec_viplotPlay.F_CondtionID)) and vu.f_username is null

执行计划：

复制代码 代码如下:

SELECT STATEMENT, GOAL = ALL_ROWS HASH UNIQUE NESTED LOOPS OUTER PARTITION RANGE ALL TABLE ACCESS FULL Object name=T_BASE_SUCCPROUSER VIEW FILTER TABLE ACCESS FULL Object name=T_BASE_VIP_CUSTOMES FAST DUAL

后来改成了下面就能全部查出来了

复制代码 代码如下:

SELECT /*+parallel(gu,4)*/distinct gu.f_username FROM t_base_succprouser gu left join t_base_vip_customes VU on gu.f_username=vu.f_username and ((vu.f_passeddate is null ) or (vu.f_passeddate > trunc(sysdate,'Y') )) and ((vu.f_lotid is null ) or (vu.f_lotid=rec_viplotplay.f_lotid)) and ((vu.f_playi公司网站建设d is null ) or (vu.f_playid=rec_viplotPlay.f_Playid)) and ((vu.f_condtionid is null ) or (vu.f_condtionid=rec_viplotPlay.F_CondtionID)) where gu.f_expectenddate > (select trunc(sysdate,'Y')FROM DUAL) and gu.f_lotid=rec_viplotplay.f_lotid and gu.f_playid=rec_viplotPlay.f_Playid and gu.f_paymoney>=rec_viplotPlay.F_Conditon_ValuesA and vu.f_username is null 执行计划： SELEC营销型网站建设T STATEMENT, GOAL = ALL_ROWS HASH UNIQUE FILTER NESTED LOOPS OUTER TABLE ACCESS BY GLOBAL INDEX ROWID Object name=T_BASE_SUCCPROUSER INDEX RANGE SCAN Object name=IX_BASE_PROUSER_LOWEX FAST DUAL VIEW TABLE ACCESS FULL Object name=T_BASE_VIP_CUSTOMES

oracle 不懂先把数据给过滤掉然后在来连接吗？ 太笨了！而且这样把符合条件的数据也过滤掉了相关如何seo优化推广网站seo网站优化。

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