达梦数据库SQL
2014-01-09 13:21
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SUBSTRING()函数
select * , substring(SONG_ID from 3) from TBL_SONG where SONG_ID like '11__';
例如select * ,'04'+substring("DBNAME"."SCHAMENAME"."TABLENAME"."INDEX_ID" from 3 )
from "DBNAME"."SCHAMENAME"."TABLENAME"."INDEX_ID" like '11___';
rownum(可以利用rownum实现数据库记录去重)
select * from TBL_SONG where rownum in (select a.rownum from (select distinct SONG_ID, rownum from TBL_SONG) as a ) as b;
或者delete from TBL_SONG where rownum not in (select a.rownum from (select distinct SONG_ID, rownum from TBL_SONG) as a ) as b;
select * , substring(SONG_ID from 3) from TBL_SONG where SONG_ID like '11__';
例如select * ,'04'+substring("DBNAME"."SCHAMENAME"."TABLENAME"."INDEX_ID" from 3 )
from "DBNAME"."SCHAMENAME"."TABLENAME"."INDEX_ID" like '11___';
rownum(可以利用rownum实现数据库记录去重)
select * from TBL_SONG where rownum in (select a.rownum from (select distinct SONG_ID, rownum from TBL_SONG) as a ) as b;
或者delete from TBL_SONG where rownum not in (select a.rownum from (select distinct SONG_ID, rownum from TBL_SONG) as a ) as b;
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