三表查询 MYSQL句子_MySQL
- WBOYOriginal
- 2016-06-01 13:06:36986browse
SELECT cp.cname, cp.cprice, dc.dcsum, cp.cprice*dc.dcsum as fensu,sj.sjname FROMcp,dc,sj WHERE cp.cno=dc.dcno AND cp.sjno = sj.sjnohittlle原来这么简单。。。我想复杂了。。注意：三个表a，b，c 查询的时候要注意他们之间要有牵制，比如 a.s=b.s and a.s=c.s 这样，否则会有重复的东西出来，就算加了distinct 只会减少重复，而不能避免重复。
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