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????1.?????????????????????????????????????????????????t??????
????2.????????????У?????ж????????????????????????
????3.????????????????????????????????????????Ч???????????????в???????????????????????????á?????????????????????
????4.??????????????????????????????????????????г???????????????????????????????С????????????????????????????????????????????????????????????????е????????*?????????β???????????????С??????
????5.where????ж??е??κβ????????????sql????????м????????????????ò????б??????????????????????????????????Щ??????????????????????????sql??????????????????????????????
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????select * from record where substring(card_no??1??4)=’5378’ && select * from record where card_no like ’5378%’
?????κζ??е???????????±???裬????????????????????????????????????????????????????
????6.where?????е?’in’???????????’or’????????????????in ('0'??'1')????column='0' or column='1'????С???????????????????or???????????????????????????????column?????????????????????????"or?? ??"????????????????or?????У????????????????????У???????????????????У?????????????м???????????????????????? column?????????????????仹???tempdb?????????????in??or???????ù????????????Ч??????????????????????????????? ????????????????e???????
????7.????????洢????????sql???????????Ч
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