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...
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 rowid not in (SELECT MIN(rowid) FROM tablename GROUP BY column1, column2, colum...
SQL>alter table cz add constraint cz_unique unique(c1,c10,c20) exceptions into exceptions; * ERROR at line 1: ORA-02299: cannot validate (TEST.CZ_UNIQUE) - duplicate keys found SQL>create table dups as select * from cz where rowid in (select row_id from exceptions); Table created. SQL...
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...
Laravel:“重置”表->truncate()或->delete()哪个更好? 通过这样做,我找到了自己的方法: \DB::beginTransaction();try { \DB::table('table_name')->where('id', $data[0]['id'])->delete(); // delete it first to avoid id duplicate when inserting, comment this if id is auto increment ...
SQL>deletefromcz awhererowid<(selectmax(rowid) fromczwherec1=a.c1andc10=a.c10andc20=a.c20); (3).适用于有少量重复记录的情况(临时表法): SQL>createtabletestasselectdistinct*fromcz; (建一个临时表test用来存放重复的记录) SQL>truncatetablecz; (清空cz表的数据,但保留cz表的结构) ...
SQL>deletefromcz awhererowid <(selectmax(rowid)fromczwherec1=a.c1andc10=a.c10andc20=a.c20); (3).适用于有少量重复记录的情况(临时表法): SQL>create table test as select distinct * from cz; (建一个临时表test用来存放重复的记录)
8、 VARCHAR2(30)CONSTRAINT VARCHAR2(30)SQLalter table cz add con stra intcz_unique uniq ue(c1,c10,c20) excepti ons into excepti ons;*ERROR at line 1:ORA-02299: cann ot validate (TEST.CZ_UNIQUE) - duplicate keys foundSQLcreate table dups as select* from cz where rowid in (select ...
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 ...