alter modify

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MySQL command modify table structure ALTER TABLE syntax

ALTER TABLE Syntax ALTER [IGNORE] TABLE tbl_name alter_spec [, Alter_spec ...] Alter_specification:ADD [COLUMN] create_definition [i | After column_name]or ADD [COLUMN] (create_definition, create_definition,...)or ADD INDEX [index_name] (Index_col_

MySQL database ALTER command explanation, MySQL ALTER command explanation

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

MySQL alter modify the length type of a field SQL statement

MySQL Modify field length ALTER TABLE news Modify column title varchar (130); ALTER TABLE name modify column field name type; For example: the title field in the news table is 100 characters in length and is changed to 130 characters ALTER TABLE

Alter database operation

1 alter Database: modify data files Alter database datafile 4 offline; Alter database datafile '/opt/Oracle/datafile/users01.dbf' offline; Alter database datafile '/opt/Oracle/datafile/users01.dbf' resize 100 m; Alter database datafile

Introduction and use of DB2 Alter Table

DB2 Alter Table introduction and use of normal Table modification and creation, you need to consider the following two situations: 1. when data is stored in a table, you can only modify the Data Type of the column to a compatible data type, or keep

Mysql alter table structure: add, delete, Modify Field, adjust field order

Mysql changes the table structure: add, delete, modify, and adjust the field order to add a field: altertable 'user _ movement_log 'AddcolumnGatewayIdintnotnulldefault0AFTER 'regionid' (after which field is added) Delete the field: altertable 'user _

Alter column and modify column

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 alter command use detailed _mysql

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 alter table structure alter, from: http://waryist.javaeye.com/blog/104739 waryist blog

  From: http://waryist.javaeye.com/blog/104739Waryist blog    Alter [ignore] Table tbl_name alter_spec [, alter_spec...]Alter_specification:Add [column]

Alter table: add, delete, change column names, modify column constraints, and change table names

Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> Alter   Table Name Alter   Table -Change table attributesSyntax Alter   Table   Table   [ * ] Add   [

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