mysql> insert into t11(name) values('Jack'),('Tom'),('Mark'),('Black'); Query OK, 4 rows affected (0.06 sec) Records: 4 Duplicates: 0 Warnings: 0 mysql> create table t12(id int primary key auto_increment,name char(20)); Query OK, 0 rows affected (0.09 sec) mysql> insert in...
for_delete; Query OK, 3 rows affected (0.04 sec) mysql> insert for_delete (name) values ('D'); Query OK, 1 row affected (0.02 sec) mysql> select * from for_delete; +---+---+ | id | name | +---+---+ | 4 | D | +---+---+ 1 row in set (0.00 sec)截断表 trunca...
#插入100W数据 mysql> call insert_user_data(1000000); Query OK,0rows affected (35.99sec) #添加相关索引 mysql> alter table user add index idx_name(name), add index idx_phone(phone); Query OK,0rows affected (6.00sec) Records:0Duplicates:0Warnings:0#表上索引统计信息 mysql> show index from...
#插入100W数据 mysql> call insert_user_data(1000000); Query OK, 0 rows affected (35.99 sec) #添加相关索引 mysql> alter table user add index idx_name(name), add index idx_phone(phone); Query OK, 0 rows affected (6.00 sec) Records: 0 Duplicates: 0 Warnings: 0 #表上索引统计信息 mysql...
/* Set no locks when applying log in online table rebuild. */ } else if (allow_duplicates) { /* If the SQL-query will update or replace duplicate key we will take X-lock for duplicates ( REPLACE, LOAD DATAFILE REPLACE, INSERT ON DUPLICATE KEY UPDATE). */ ...
I am trying to find if data (let's say rows) duplicate in Table 1 first and remove them. Then I want to see if Table 2 duplicates any of Table 1's rows and remove them from Table 2. Then I will have both tables as clean as I can make things. I can then export the data for...
mysql> CREATE PROCEDURE insert_user_data(num INTEGER) -> BEGIN -> DECLARE v_i int unsigned DEFAULT 0; -> set autocommit= 0; -> WHILE v_i -> insert into user(`name`, age, gender, phone) values (CONCAT('lyn',v_i), mod(v_i,120), 'M', CONCAT('152',ROUND(RAND(1)*100000000...
mysql> insert into student(name,age,birthday) values('好大','18',1936-02-21),('好小','28','1992-01-01'); Query OK,2rows affected,1warning (0.00sec) Records:2Duplicates:0Warnings:1mysql>select* from student; +---+---+---+---+---+---+ | id | name | age | gender | ...
我负责的有几个系统随着业务量的增长,存储在MySQL中的数据日益剧增,我当时就想现在的业务方不讲武德,搞偷袭,趁我没反应过来把很多表,很快,很快啊都打到了亿级别,我大意了,没有闪,这就导致跟其Join的表的SQL变得很慢,对的应用接口的response time也变长了,影响了用户体验。
The rows returned are the duplicates and what I see returned are from table1. So I actually want to delete them from table2 if I understand this correctly, thus I should be returning table2 inmy SELECT, right? Then I could just delete those. Or am I over simplifying my position?