create table mysql if not exists

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MySQL table sharding Methods: MySQL

MySQL table sharding Methods: MySQL I. Let me explain why Table sharding is required. When a piece of data reaches several millions, it takes more time for you to query the data at a time. If there is a joint query, I think it may die there. The

Create and delete indexes in the MySQL database

The following articles mainly describe the creation and deletion of MySQL databases, as well as the detailed parsing of indexes and changing actual table statements. If you are also popular with MySQL databases, you can click the following article

How to create a Mysql table partition _mysql

Table partitioning is only recently known Oh, I used to do is the table to achieve the billion level of data, I would like to give you a description of the MySQL table partition to create and use it, I hope to be helpful to you classmates. Table

SQL query in the in, exists, not in, not exists usage and difference, sqlexists

SQL query in the in, exists, not in, not exists usage and difference, sqlexists 1. in and exists In connects the External table to the internal table as a hash (Dictionary set), while exists loops the External table and queries the internal table

Usage and difference of in, exists, not in, and not exists in SQL queries

Usage and difference of in, exists, not in, and not exists in SQL queries 1. in and exists In connects the External table to the internal table as a hash (Dictionary set), while exists loops the External table and queries the internal table after

MySQL Common instructions, java,php programmers, database engineers must. Programmers Xiaoice Common Data collation

MySQL常用指令,java,php程序员,数据库工程师必备。程序员小冰常用资料整理MySQL common commands (for reference)The most common display commands are:1. Display the list of databases.show databases;2. Display the data table in the library:Use MySQL;Show tables;3, display the

Update if mysql processing exists, and insert if not (multiple columns of unique indexes)

When mysql processes a unique index, it updates the index. If it does not exist, it should be very common to insert the index. There are many similar articles on the Internet, today I will talk about the problems and methods that may occur when this

MySQL Create temp table-old table build new table

1. Create a temporary tableA temporary table is a table, used to temporarily save some dataCharacteristics:Visible only to the user who created the temporary table ;When the session ends, MySQL automatically deletes the temporary table.The core of

Implementation Method of updating if a MySQL record does not exist and an insert record exists

Insert when the MySQL record does not exist In MySQL, inserting a record is very simple, but in some special applications, before inserting a record, you need to check whether the record already exists. The insert operation is performed only when

MySQL CREATE TABLE

the basic syntax for the CREATE TABLE statement in MySQL is: CREATE [temporary] TABLE [IF not EXISTS] tbl_name [(create_definition,...)] [Table_options] [Select_statement] Temporary: This keyword indicates that a new table created

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