Sql代碼??
- MERGE? INTO ?CRPROPTREND?T1?USING?DUAL?T2??
- ON ?(T1.URIMD5= "abc" )??
- WHEN ?MATCHED? THEN ??
- INSERT VALUES (...)??
- WHEN ? NOT ?MATCHED? THEN ??
- UPDATE ? SET ?...;??
Sql代碼??
- --?This?query?is?not?editable,?but?generally?faster? ??
- Select ???
- ?????????URIMD5,??
- ????????? count (*)??
- from ?????RUNPPV.CRPROPTREND??
- group ? by ???
- ?????????URIMD5??
- having ??? count (*)?>?1??
- ??
- ??
- --?This?query?is?editable,?but?generally?slower? ??
- Select ?A1.*,?A1.rowid??
- from ?RUNPPV.CRPROPTREND?A1???
- where ?exists?( Select ? 'x' ? from ?RUNPPV.CRPROPTREND?A2???
- where ?A1.URIMD5?=?A2.URIMD5??
- and ?A1.ROWID?<>?A2.ROWID)??
- --?To?delete?all?but?one?of?each?duplicate?row,? ??
- --?change?the?first?line?to?'Delete'? ??
- --?and?change?the?'<>'?to?'>'?(keeps?first?duplicate)? ??
- --?????????????????????or?'<'?(keeps?last?duplicate)? ??
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