If you need to remove duplicate rows from an Oracle Database Table, you can use different approaches. For example, you can use the DELETE command with a criteria that selects only duplicates. Usually it is faster to create a new table with distinct rows and replace the old table with the...
标签:Word VBA 本示例演示如何使用代码删除已排序表中第1列内容相同的行,代码如下: Sub DeleteTableDuplicateRows() Dim objTable As Table...列的文本 If objRow.Cells(1).Range = objNextRow.Cells(1).Range Then '如果相同则删除第2行 objNextRow.Rows...= True End Sub 上面的代码区分大小写,即...
delete from tbl a where rowid not in (select max(b.rowid) from tbl b where a.col1=b.col1 and a.col2 = b.col2);//这里max使用min也可以 或者用下面的语句 delete from tbl a where rowid < (select max(b.rowid) from tbl b where a.col1=b.col1 and a.col2 = b.col2);//这里...
SELECT tablespace_name FROM all_tables WHERE table_name = 'YOURTABLENAME'; 18 How to remove duplicate rows from a table If the unique/primary keys can be identified from the table, it is easier to remove the records from the table using the following query: DELETE FROM tablename WHERE row...
20 rows selected. 1.查找重复记录的几种方法: (1).SQL>select * from cz group by c1,c10,c20 having count(*) >1; C1 C10 C20 --- --- --- 1 2 dsf 2 3 che 3 4 dff (2).SQL>select distinct * from cz; C1 C10 C20 --- --...
20 rows selected. 1.查找重复记录的几种方法: (1).SQL>select * from cz group by c1,c10,c20 having count(*) >1; C1 C10 C20 --- --- --- 1 2 dsf 2 3 che 3 4 dff (2).SQL>select distinct * from cz; C1 C10 C20 --- --...
selected.SQLdelete from cz where rowid in(select row_id from excepti on s);16 rows deleted.SQL insert into cz select disti net * from dups;3 rows created.SQLselect *from cz;C1 C10 C201 2 dsf2 3 che3 4 dff4 5 err5 3 dar6 1 wee7 2 zxc7 rows selected.从结果里可以看到重复记录...
7 rows selected. 从结果里可以看到重复记录已经删除。 Oracle查询删除表中重复记录 最高效删除重复记录的方法,使用为例rowid DELETE FROM EMP E WHERE E.ROWID > (SELECT MIN(X.ROWID) FROM EMP X WHERE X.EMP_NO = E.EMP_NO); 1、查找表中多余的重复记录,重复记录是根据单个字段(peopleId)来判断 ...
If there are duplicate records, then run the scripts provided in the 'Fix' column within the 'Solution - Datafix' section for the appropriate base version to delete duplicate records. Note:You must eliminate duplicate records before upgrading to Release 12.2. If you require help eliminating duplic...
DUPLICATE VARCHAR2(1) A value of Y means that the keyword is a duplicate of another keyword. A value of N means that it is not a duplicate. 6.小结 很多问题Oracle都在内部给出了答案,很是便利。如本例中使用V$RESERVED_WORDS视图快速得到保留字的功能就是一个很好的例子。