删除没有主键的表中的重复记录
删除没有主键的表中的重复记录 create procedure delrepeat as begin SELECT distinct * INTO testTemp FROM test delete from test insert into test SELECT * FROM testTemp drop table testTemp end distinct:用于查询中去除重复项
删除没有主键的表中的重复记录
create procedure delrepeat
as
begin
SELECT distinct * INTO testTemp FROM test
delete from test
insert into test SELECT * FROM testTemp
drop table testTemp
end
distinct:用于查询中去除重复项
begin~end范围语句表示存储过程中作为整体执行的语句块
oracle数据库教程
delete from a1 where rowid not in(select max(rowid) from a1 group by aa,bb,cc); --以物理行号rowid来处理，很是活学活用：）
ern的贴子
用临时表的方法
CREATE TABLE TMP_TABLE SELECT DISTINCT * FROM TABLE_NAME;
DROP TABLE_NAME;
CREATE TABLE TABLE_NAME SELECT * FROM TMP_TABLE;
DROP TMP_TABLE;
COMMIT;
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