mysql_3

修改表 alter [ignore] table tbl_name alter_specification [, alter_specification] ... alter_specification: add [column] column_definition [first | after col_name ] /*添加列*/ | alter [column] col_name {set default literal | drop default} /*修改默认值*/ | change [column] old_col_name column_definition [first|after col_name] /*对列重命名*/ | modify [column] column_definition [first | after col_name] /*修改列类型*/ | drop [column] col_name /*删除列*/ | rename [to] new_tbl_name /*重命名该表*/ | order by col_name /*排序*/ | convert to character set charset_name [collate collation_name] /*将字符集转换为 二进制*/ | [default] character set charset_name [collate collation_name] /*修改默认字符集*/ | table_options | 列或表中索引项的增、删、改 --复制表 create [temporary] table [if not exists] tbl_name [ () like old_tbl_name [ ] ]--创建一个一模一样的空表 | [as (select_statement)];--复制创建表并复制内容，但索引和完整性约束是不会复制的 --删除表 drop [temporary] table [if exists] tbl_name [, tbl_name] ... -------------------------------------------------------------------------------------------------------------------- --创建索引 create [unique | fulltext | spatial] index index_name--spatial表示为空间索引 [using index_type]--为存储引擎支持的索引类型的名称(btree|hash),默认btree on tbl_name (index_col_name,...) index_col_name: col_name [(length)] [asc | desc]--length表示使用列的前length个字符创建索引。 --alter table语句 alter [ignore] table tbl_name add index [index_name] [index_type] (index_col_name,...) /*添加索引*/ | add [constraint [symbol]] primary key [index_type] (index_col_name,...)/*添加主键*/ | add [constraint [symbol]]unique [index_name] [index_type] (index_col_name,...)/*添加唯一性索引*/ | add [fulltext | spatial] [index_name] (index_col_name,...) /*添加全文索引*/ | add [constraint [symbol]] foreign key [index_name] (index_col_name,...)[reference_definition]/*添加外键*/ | disable keys--只在MyISAM表中有用，使用ALTER TABLE...DISABLE KEYS可以让MySQL在更新表时停止更新MyISAM表中的非唯一索引， | enable keys --然后使用ALTER TABLe ... enable keys重新创建丢失的索引，这样可以大大地加快查询的速度。 --删除索引 drop index index_name on tbl_name

 

mysql_3

标签：sts   ...   fulltext   options   lte   重命名   cat   排序   symbol