MySQL Tutorial alter modify Word Name Table name structure Add column
ALTER TABLE statementThe ALTER TABLE statement is used to add, modify, or delete columns in an existing table.
SQL ALTER TABLE syntaxIf you want to add columns to the table, use
Mysql tutorial alter name table name structure add Column
Alter table statementThe alter table statement is used to add, modify, or delete columns in an existing table.
SQL alter table syntaxTo add columns to a table, use the following syntax:
Alter
ALTER TABLE allows you to modify the structure of an existing table. For example, you can add or delete columns, create or eliminate indexes, change the type of existing columns, or rename columns or the table itself. You can also change the
MySQL database ALTER command explanation, MySQL ALTER command explanation
MySQL is a Relational Database Management System. This so-called "Relational" can be understood as "tables". A Relational Database consists of one or more tables.
When we need
This article mainly introduces how to use the ALTER command in MySQL, which is the basic knowledge in MySQL beginners. it is very useful for anyone who needs it to refer to the ALTER command in MySQL, if you want to change the table name, table
Detailed description of the use of the ALTER command in MySQL, mysqlalter
MySQL's ALTER command is very useful when you want to change the table name, table fields, or if you want to add or delete columns in an existing table.
Let's start to create
5.6, we found that the alter column step is the same as the modify column step.
Mysql>Create Table Xs (name varchar (12), age int default 5 );Query OK, 0 rows affected (0.34 Sec)
Mysql>Insert into Xs values ('A', 4 );Query OK, 1 row affected (0.05
MySQL's alter command is very useful when you want to change the name of the table, the field of the table, or if you want to add or delete columns from an existing table.
Let's start by creating a use case with a table named Testalter_tbl:
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.