join on and
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select * form tab1 left join tab2 on (tab1.a = tab2.b and tab2.c=’AAA’)该条语句中括号可以要也可以不要,and tab2.c=’AAA’ 的作用是先对tab2中的tab2.b做groud by 再把它与tab1 join 其中tab2.c=’AAA’不一定要为tab2.c可以tab2中的任何一个字段如tab2.e ’AAA’也可以是任意值但是groud by后留下的那一条数据中的值为满足条件tab2.c=’AAA’的那一条数据。
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