basically I want to remove thexxxx@nowhere.comrow where the cust_type is equal to 1...but only when there's a duplicate entry. Can anyone explain the syntax that I would have to use? I've tried looking into COUNT() and stuff like that but the combined syntax of COUNT() and DELETE...
deletep1fromPerson p1, Person p2wherep1.id>p2.idandp1.Email=p2.Email; 此答案通过测试,但是效率较低. 答案二 后续思考中发现,可以使用临时表解决SELECT与DELETE同时存在的问题,答案如下所示: DELETEFROMPersonWHEREIdIN(SELECTIdFROM(SELECTp1.IdasIdFROMPerson p1, Person p2WHEREp1.Email=p2.EmailANDp1...
如若你也不知道怎么操作后,突然对表进行增删查改的操作后,出现此问题,那么采用暴力解决法 方案一: 1、查询是否锁表 show OPEN TABLES where In_use >0; 2、在mysql黑框中或者navicat查询界面中输入: sh ... 数据库 mysql javascript 杀死进程 增删查改 mysql Deadlock found when trying to get lock 解锁...
INSERT操作在插入或更新记录时,检查到 duplicate key或者有一个被标记删除的duplicate key(本文的案例),对于普通的INSERT/UPDATE,会加LOCK_S属性锁next-key lock。而对于类似REPLACE INTO或者INSERT … ON DUPLICATE这样的SQL加的是X锁。而针对不同的索引类型也有所不同: 代码位置 row0ins.cc:2013 if (flags & ...
In addition, the NumPlan table also has duplicate entries for x5110. All others are single entries. What is this for and should there be: 1. Duplicates? 2. Entries for extensions that have been deleted? I have this problem too Labels: Other Collaboration...
196. Delete Duplicate Emails Write a SQL query to delete all duplicate email entries in a table namedPerson, keeping only unique emails based on itssmallestId. +---+---+ | Id | Email | +---+---+ | 1 | john@example.com | | 2 | bob@example...
mysql tables in use 1, locked 1 5 lock struct(s), heap size 1184, 4 row lock(s), undo log entries 2 MySQL thread id 3525490, OS thread handle 0x7f78eab82700, query id 780039714 localhost root update insert into ty(a,b) values(2,10) ...
Solved: Hi gurus, In my internal table i want to delete the duplicate entries . I used DELETE DUPLICATE ENTRIES Syntax, but there is one situation where one document
196. Delete Duplicate Emails Write a SQL query to delete all duplicate email entries in a table named Person, keeping only unique emails based on its smallest Id. +---+---+ | Id | Email | +---+---+ | 1 | john@example.com | | 2 | bob@example...
when MAC address of existing NIC interface changes, the entry in host details can get duplicated when trying to save any changes to the host details, it fails with error message: Some of the interfaces are invalid. Please check the table below. ...