MySQL表修改的实际操作语法描述-mysql教程-PHP中文网

MySQL表修改的实际操作语法描述

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发布： 2016-06-07 16:09:28

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以下的文章主要讲述的是MySQL表修改，即，增加或是删减列与创建或取消索引等相关操作，我们大家都知道MySQL在创建一个相关的数据库后，如果接着继续创建一张表而且加如了一些字段，那么我以后还想再增加字段怎么做？解答：使用alter table(修改表)! ALTER T

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以下的文章主要讲述的是mysql表修改，即，增加或是删减列与创建或取消索引等相关操作，我们大家都知道mysql在创建一个相关的数据库后，如果接着继续创建一张表而且加如了一些字段，那么我以后还想再增加字段怎么做？

解答：使用alter table(修改表)!

ALTER TABLE语法：

<ol class="dp-xml"><li class="alt"><span><span>ALTER [IGNORE] TABLE tbl_name  </span></span></li><li><span>alter_specification [, alter_specification] ...  </span></li><li class="alt"><span>alter_specification:  </span></li><li><span>ADD [COLUMN] column_definition [FIRST | AFTER col_name ]  </span></li><li class="alt"><span>| ADD [COLUMN] (column_definition,...)  </span></li><li><span>| ADD INDEX [index_name] [index_type] (index_col_name,...)  </span></li><li class="alt"><span>| ADD [CONSTRAINT [symbol]]  </span></li><li><span>PRIMARY KEY [index_type] (index_col_name,...)  </span></li><li class="alt"><span>| ADD [CONSTRAINT [symbol]]  </span></li><li><span>UNIQUE [index_name] [index_type] (index_col_name,...)  </span></li><li class="alt"><span>| ADD [FULLTEXT|SPATIAL] [index_name] (index_col_name,...)  </span></li><li><span>| ADD [CONSTRAINT [symbol]]  </span></li><li class="alt"><span>FOREIGN KEY [index_name] (index_col_name,...)  </span></li><li><span>[reference_definition]  </span></li><li class="alt"><span>| ALTER [COLUMN] col_name {SET DEFAULT literal | DROP DEFAULT}  </span></li><li><span>| CHANGE [COLUMN] old_col_name column_definition  </span></li><li class="alt"><span>[FIRST|AFTER col_name]  </span></li><li><span>| MODIFY [COLUMN] column_definition [FIRST | AFTER col_name]  </span></li><li class="alt"><span>| DROP [COLUMN] col_name  </span></li><li><span>| DROP PRIMARY KEY  </span></li><li class="alt"><span>| DROP INDEX index_name  </span></li><li><span>| DROP FOREIGN KEY fk_symbol  </span></li><li class="alt"><span>| DISABLE KEYS  </span></li><li><span>| ENABLE KEYS  </span></li><li class="alt"><span>| RENAME [TO] new_tbl_name  </span></li><li><span>| ORDER BY col_name  </span></li><li class="alt"><span>| CONVERT TO CHARACTER SET charset_name [COLLATE collation_name]  </span></li><li><span>| [DEFAULT] CHARACTER SET charset_name [COLLATE collation_name]  </span></li><li class="alt"><span>| DISCARD TABLESPACE | IMPORT TABLESPACE | table_options  </span></li><li><span>| partition_options  </span></li><li class="alt"><span>| ADD PARTITION partition_definition  </span></li><li><span>| DROP PARTITION partition_names  </span></li><li class="alt"><span>| COALESCE PARTITION number  </span></li><li><span>| REORGANIZE PARTITION partition_names INTO (partition_definitions)  </span></li><li class="alt"><span>| ANALYZE PARTITION partition_names  </span></li><li><span>| CHECK PARTITION partition_names  </span></li><li class="alt"><span>| OPTIMIZE PARTITION partition_names  </span></li><li><span>| REBUILD PARTITION partition_names  </span></li><li class="alt"><span>| REPAIR PARTITION pa   </span></li></ol>

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