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...
你想删除一个表里的重复记录,考虑如下的表。create table dupes (id integer, name varchar(10)) insert into dupes values (1, 'NAPOLEON') insert into dupes values (2, 'DYNAMITE') insert into dupes values (3, 'DYNAMITE') insert into dupes values (4, 'SHE SELLS') insert into dupes values ...
那如果换成delete呢?同样保持开关打开,跟踪如下:"steps": [ { "expanded_query": "/* select#2 */ select `t_table_2`.`id` from `t_table_2` where (`t_table_2`.`uid` = 1)" }, { "transformation": { "select#": 2, "from": "IN (SELECT)", "to": "semijoin", "chosen": fal...
开始我们拿sql到数据库查询平台查库执行计划,无奈这个平台有bug,delete语句无法查看,所以我们改成select,“应该”是一样。这个“应该”加了双引号,导致我们走了一点弯路。 EXPLAINSELECT*fromt_table_1wheretask_idin(selectidfromt_table_2whereuid=1)
ERROR 1062 (23000): Duplicate entry '2' for key 1 mysql> alter ignore table invoices add unique index (invoice_number); Query OK, 4 rows affected (0.03 sec) Records: 4 Duplicates: 1 Warnings: 0 mysql> select * from invoices;
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') ...
Create:增,Retrieve:查,Update:改,Delete:删。 下面一一介绍。 首先新建一张表。 MariaDB [prictice]> create table student( -> id int unsigned primary key auto_increment, -> stu_id int not null unique, -> name char(6) not null,
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DUPLICATE_SCOPE 指定复制表的属性,取值如下: 使用CREATE DATABASE 语句创建数据库。 示例:创建数据库 db1,指定字符集为 utf8mb4,并创建读写属性。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 obclient> CREATE DATABASE db1 DEFAULT CHARACTER SET utf8mb4 READ WRITE; Query OK, 1 row affected ...