alter table set

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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

Compare alter table t move and alter table t shrink space in Oracle

Alter table t move and alter table t shrink space can both be used for CIDR and CIDR to reduce the HWM,It can also be used to eliminate Row Chaining and Row Migration ),But there are the following differences:1) Using alter table move will contract

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_

PostgreSQL alter table (en)

Name Alter table -- change the definition of a table Synopsis ALTER TABLE [ ONLY ] name [ * ] action [, ... ]ALTER TABLE [ ONLY ] name [ * ] RENAME [ COLUMN ] column TO new_columnALTER TABLE name RENAME TO new_nameALTER TABLE name SET

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]

ORACLE: ALTER TABLE

This section describes how to use the alter table statement to modify a table. The alter table statement can execute the following tasks: 1. Add, modify, or delete Columns 2. add or delete Constraints 3. enable or disable Constraints 1. Add a 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   [

Basic usage of ALTER TABLE command in MYSQL and speed-increasing optimization _mysql

First, basic usage 1. Add Column ALTER TABLE Tbl_name add col_name type For example, add a column of weight to the pet table, Mysql>alter table Pet Add weight int; 2. Delete Column ALTER TABLE Tbl_name drop 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

MySQL5.6 ALTER TABLE Analysis and testing

In MySQL5.5 and previous versions, performing an alter operation on a large table (over millions of records) in a running production environment is a difficult task. Because the table and lock table will be rebuilt, affecting the user's use. It is

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