Now the situation is that the duplicate row is in the local temporary table. All we need to now is to delete records from main table customers1 as per matching custid of the local temporary table. Delete from customers1 where custid in (select Custid from #Temp_customers1) Will the above...
How to Delete Duplicate Records in SQL Server Usually on daily basis we usually need to perform removing duplicate records from a table. This post can help you to understand “How to Delete Duplicate Records in SQL Server”. Here consider an example for removing duplicate records. IF EXISTS(SE...
Now that we can easily identify the duplicate records we now need to determine which ones should be removed. If we were to use the unique fields in a DELETE statement we would remove all entries. -- Incorrect - this will remove all sets of duplicate records. DELETE invoices FROM invoices ...
正常来说应该是一样的,delete无非就是先查,加锁,再删。 拿到本地环境执行再次查看执行计划,发现确实不同,select的是一样的,但delete的变成全表扫描了。 首先这就符合问题现象了,虽然没有死锁,但每个delete语句都全表扫描,相当于全表加锁,后面的请求就只能等待释放锁,等到超时就出现“Lock wait timeout exceeded...
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 select * from people where peopleId in (select peopleId from people group by peopleId having count(peopleId) > 1) 2、删除表中多余的重复记录,重复记录是根据单个字段(peopleId)来判断,只留有rowid最小的记录 delete from people wher...
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4.16. Deleting Duplicate Records Problem You want to delete duplicate records from a table. Consider the following table: create table dupes (id integer, name varchar(10))insert into dupes values (1, 'NAPOLEON') insert into dupes values (2, 'DYNAMITE') ...
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OK, 6 rows affected (0.00 sec)Records: 6 Duplicates: 0 Warnings: 0 思路: 1)创建一个跟duplicate_table 相同类型的表格。 CREATE TABLE no_duplicate_table LIKE duplicate_table; 2)将duplicate_table的去重数据插入到no_duplicate_table INSERT INTO no_duplicate_table SELECT DISTINCT * FROM duplicate_tab...
Records:0Duplicates:0Warnings:0mysql> insert into orders3(order_num,cust_id,order_date) values(20010,10007,'2005-09-01 00:00:00');#insert第一种方式 Query OK,1row affected (0.00sec) mysql>select*from orders3;+---+---+---+ | order_num | order_date | cust_id | +---...