SQL新手求教这段有无优化空间？
- SQL code
create temporary table tbd(id int) select id from d where para <> 1234; delete from t1 where id in (select id from tbd); delete from t2 where id in (select id from tbd); delete from t3 where id in (select id from tbd); delete from t4 where id in (select id from tbd); drop table tbd;
欢迎大家阅读《SQL生手求教这段有无优化空间》,跪求各位点评，by 搞代码
新手求教，有无改进空间？怎么改进？
——解决方案——————–
delete t1 from t1,d where t1.id=d.id;
delete t1 from t2,d where t2.id=d.id;
delete t1 from t3,d where t3.id=d.id;
delete t1 from t4,d where t4.id=d.id;
——解决方案——————–
explain …不就知道了吗
——解决方案——————–
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转载请注明原文链接：SQL生手求教这段有无优化空间
