Duplicate rowsPosted by: James Medick Date: June 15, 2020 04:45PM I have two tables, one Assets and one System Assets. Assets contains all asssets, system assets contain only specific assets assigned to a specific system. I'm trying to write a query where I can list all of the ...
insert ignore into test_data(xid,name) values(1,'aaa');Query OK, 0 rows affected, 1 warning (0.01 sec)mysql--root@localhost:test 18:58:13>>show warnings;+---+---+---+| Level | Code | Message |+---+---+---+| Warning | 1062 | Duplicate entry '1' for key 'xid' |+--...
Description: Using EXISTS as a filter condition may result in duplicate rows How to repeat: according to this SQL script: ``` -- auto-generated definition create table group_info ( id int primary key, group_id bigint not null, group_type varchar(10) not null, source varchar(255) null ...
rows in set (0.01 sec) mysql> SET SESSION optimizer_switch='index_condition_pushdown=off'; Query OK, 0 rows affected (0.00 sec) mysql> SELECT pk, col_int FROM t1 WHERE pk <> 3; +---+---+ | pk | col_int | +---+---+ | 1 | 530644992 | | 2 | 7 | | 4 | 3 | | ...
Delete Duplicate Rows in MySQL After confirming that a database contains duplicate entries, delete them using the options mentioned below. The options include using theROW_NUMBER()function, theJOINSstatement, theGROUP BYclause, and theDISTINCTkeyword. ...
关于MySQL中insert ignore,insert on duplicate和replace into,你可能没想过区别,在数据流转中或者日常的数据操作中,势必会有数据写入的过程,如果把一些数据写入一张数据库表中,如果写入量有100万,而重复的数据有90万,那么如何让这10%的数据能够更高更高效的写入。
mysql> select * from test; +---+---+---+ | a | b | c | +---+---+---+ | 1 | 1 | 2 | | 2 | 2 | 2 | +---+---+---+ 2 rows in set (0.00 sec) 1. 2. 3. 4. 5. 6. 7. 8. 上面的语句等同于:
mysql>INSERTINTOtVALUESROW(2,3),ROW(3,3)ONDUPLICATEKEYUPDATEa=a+1,b=b-1;ERROR 1062 (23000):Duplicate entry '1' for key 't.b'mysql>TABLEt;+---+---+|a|b|+---+---+|1|1||2|2|+---+---+2 rows in set (0.00 sec) ...
mysql>updatetable_testsetoc_sys_dict_id=9999whereoc_sys_dict_id=0; Query OK,1row affected (0.00sec) #3、修改主键属性 mysql>altertabletable_test CHANGE oc_sys_dict_id oc_sys_dict_idbigint(40)NOTNULLauto_incrementprimarykey; Query OK,37rows affected (0.03sec) ...
Say for example if I use crmid I don't want duplicates in that column because that means I'm also returning multiple name fields and I only want one name field per crmid. Thank you for your help. Sorry, you can't reply to this topic. It has been closed....