1
...where (f1=? and f2=? and f3=?) or
(f1=?? and f2=?? and f3=??) or
(f1=??? and f2=??? and f3=???)
2
...where f1=? and f2=? and f3=? or
f1=?? and f2=?? and f3=?? or
f1=??? and f2=??? and f3=???
这2种形式等效吗?
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这2种形式等效吗?
1 ...where (f1=? and f2=? and f3=?) or (f1=?? and f2=?? and f3=??) or (f1=??? and f2=??? and f3=???) 2 ...where f1=? and f2=? and f3=? or f1=?? and f2=?? and f3=?? or f1=??? and f2=??? and f3=??? 这2种形式等效吗?