aa表:列为a,b
bb表:列为a,b
两表合成的语句是:select a.a as aa,a.b as ab ,b.a as ba ,b.b as bb from aa,bb
结果是
aa ab ba bb
1 2 3 4
====================================================
bb表:列为a,b
两表合成的语句是:select a.a as aa,a.b as ab ,b.a as ba ,b.b as bb from aa,bb
结果是
aa ab ba bb
1 2 3 4
====================================================
解决方案 »
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