’ma
’stock
umberbetwee
20a
d100stock
umberi
102030orderbystockiddescasc排序,desc降序,asc升序orderby12by列号stock
ameselectstock
amefromstock_i
formatio
wherestockid4子查询httpwwwac
ow
etoYIpsxSPAIC除非能确保内层select只返回一个行的值,否则应在外层where子句中用一个i
限定符selectdisti
ctcolum
_
ameformtable_
amedisti
ct指定检索独有的列值,不重复selectstock
umber