sql - 需要从 30 列的表中删除重复记录

Question

我需要从具有 30 列的表中删除确切的重复记录。我的数据看起来像是附加的。提前谢谢！

Answer 1

你的问题我是这样理解的...

1）如果您只想从重复行中删除一条记录。在这种情况下，您需要在表中包含（当前时间戳）的列日期

delete from tableName t1 where
t1.id in (SELECT     t2.id
         FROM         tableName t2
         where t1.id = t2.id and t1.date(timestamp) < t2.date(timestamp))

2）如果你想删除完整的重复行

delete from tableName t1 where
t1.id in (SELECT     t2.id
         FROM         tableName t2
         group by t2.id
         having count(*) >1)

Answer 2

这个应该工作：

delete from <table>
where rowid IN (
     SELECT LEAD(rowid) OVER (PARTITION BY <col1>, <col2>,...,<coln> ORDER BY NULL) 
     FROM <table>
);

当然还有小提琴