insert into on duplicate场景 insert into test_data values(1,'aa') on duplicate key update id=id;Query OK, 0 rows affected (0.00 sec)insert into test_data values(1,'aa') on duplicate key update id=id, name=name;Query OK, 0 rows affected (0.00 sec) show create table test_data\G ...
->('Susan','Arizona','susan@javatpoint.com'); ERROR1062(23000):Duplicateentry'Carine-carine@javatpoint.com'forkey'PRIMARY' mysql>select*fromstudent_contacts; Emptyset(0.00sec) INSERT IGNORE INTO 与 INSERT INTO 的区别就是 INSERT IGNORE INTO 会忽略数据...
显示全部数据(反复数据仅仅显示一次) 以下的SQL简单高速有效,但不能保证反复字段的records显示哪一个record。 SELECT * FROM t1 GROUP BY NAME #having count(*) > 1 #加上这条语句,反复字段的records仅仅显示一次 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 删除反复数据: 1 最简单高速的方法: 1. ...
Re: Query Help - Duplicate Records Christopher Wibberley November 22, 2016 03:40AM Re: Query Help - Duplicate Records Peter Brawley November 22, 2016 02:14PM Sorry, you can't reply to this topic. It has been closed. Content reproduced on this site is the property of the respective copyr...
mysql:(none)22:26:06>>insert into test.yeyzvalues(5,5),(6,6);QueryOK,2rowsaffected(0.00sec)Records:2Duplicates:0Warnings:0 此时观察从节点: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 mysql:(none)22:26:34>>show slave status\GMaster_Host:10.30.124.68Master_User:dba_replMaster_Po...
set (0.00 sec) mysql> begin; Query OK, 0 rows affected (0.00 sec) mysql> insert into test_2 select * from test_1 where name = 'test_1'; Query OK, 1 row affected (0.00 sec) Records: 1 Duplicates: 0 Warnings: 0 此时看下锁信息,能看到test_2上是没有任何锁,因此不会出现RR会锁定...
mysql> INSERT INTO users (id, name, age) VALUES (1, 'AAA', 30), (4, 'DD', 35) ON DUPLICATE KEY UPDATE name = VALUES(name), age = VALUES(age); Query OK, 3 rows affected (0.02 sec) Records: 2 Duplicates: 1 Warnings: 0 此时主键为 1 的记录实际更新了数据,影响行数为 2,主键...
root:test> insert ignore into t3 (c1,c2,c3) values(5,‘cc’,4),(6,‘dd’,5); Query OK, 1 row affected, 1 warning (0.01 sec) Records: 2 Duplicates: 1 Warnings: 1 1. 2. 如下,可以看到只插入了(6,‘dd’,5)这条,同时有一条warning提示有重复的值。
mysql> insert into test1(id,name,type)(select id,name,type from test2) on DUPLICATE KEY UPDATE test1.name=test2.name; Query OK, 5 rows affected (0.04 sec) Records: 4 Duplicates: 1 Warnings: 0 mysql> select * from test1; +---+---+---+ | id | name...
Count duplicate records in MySQL To count the total duplicate (or more) 'quantity' of 'item' table you can use the following query: Code: SELECT count(*) AS Total_duplicate_count FROM (SELECT item_code FROM item GROUP BY quantity HAVING COUNT(quantity) > 1 ...