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??????1???α?????
?????α???????????????????????????????????????????Select?????????????SQL?????????????????????????????α????????????????
?????? ?α?????????????е?Select????????????????
?????? ?α?λ??????????α????????????????????
?????????α????????????????е????С??α??????????????????????????????α????????????????????????е??α???????????ж????????????е??????
??????2?????α?
?????α??????????????????????????????????????????????е??α?????????????????????????????????????????????綽?????綽????????????????????????????????????????????????????????????????????????????綽?????????????????????????????α????????????????????????????????????????е????????????????????????????????????????????????????α???????????????????????????????????е?????????????????α?
???????????α???????綽???????????????????
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??????????????????α????????????μ???裺
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?????? ???α??в???????
?????? ????α?
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????????α?????????????????????????????α?????????????????for update??for read only???????α????????????μ????????
Declare cursor_name cursor
For select_statement
[for{read only|update[of colum_name_list]}]
??????

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