1, create a data table
| The basic syntax: create table table name (field name field type [Field Properties], the field name field type [Field Properties], ...) [Table Option] |
Example: Create a data table
Error described above: Table must be placed under the corresponding database: There are two ways may be linked into the table to the specified database.
. "" (1) before the data table name with the database name, connection to: database data table.
(2) before creating the data table to enter into a specific database to: use database name;
Table Options: Similar to database options
Engine: storage engine, specific way of storing data provided by mysql, there is a default innodb (5.5 previous default myisam)
Charset: character sets, only (level higher than the database) table is valid for the current own
Collate: proofreading set
Example: Create a data table using the Table Options
2, copy the existing table structure
Copy (copy only structural: the data table is not copied) from the existing table replication
| The basic syntax: create table new table like table name; // Just use the database table name, you can access other database table name in any database. |
3, the display data table
Whenever a data table is created, it will create some files in the corresponding database (and related storage engine)
Note: This configuration file from the innodb storage engine, innodb storage engine all files are stored in an external file ibdata
4, displaying all the tables
| The basic syntax: show tables; |
Example: All the tables
5, match the display table
| The basic syntax: show tables like 'pattern match'; |
Example: using the matching table display
6, showing the table structure
Essential meaning: shown in the table included in the field information (name, type, attributes, etc.)
| Describe 表名 |
| Desc table |
| show columns from 表名 |
Example: display table structure
7, table creation statement
View the data sheet statement is created: to see the results of this statement has not previously entered by the user a statement.
| The basic syntax: show create table table name; |
Example: display used to create Statement List
8, the statement terminator
There are several Mysql statement terminator
| ; Effect \ G is represented by the same, is the field in the row sideways, with the following corresponding data \ G field vertically on the left side, the right side of the data sideways |
9, setting the table properties
表属性指的就是表选项：engine，charset和collate
| 基本语法：alter table 表名 表选项 [=] 值; |
范例：设置表属性
注意：如果数据库已经确定了，里面有很多数据了，不要轻易修改表选项（字符集影响不大）
10、修改表结构
| 修改表名：rename table 旧表名 to 新表名 |
范例：修改表的结构
| 修改表选项：alter table 表名 表选项 [=] 新值 |
| 新增字段：alter table 表名 add [column] 新字段名 列类型 [列属性] [位置first/after 字段名] |
范例：新增字段
说明：
| 字段位置：字段想要存放的位置 First：在某某之前（最前面），第一个字段 After 字段名：放在某个具体的字段之后（默认的） |
范例：字段位置的使用
| 修改字段名：alter table 表名 change 旧字段名 新字段名 字段类型 [列属性] [新位置] |
范例：修改字段名称
| 修改字段类型（属性）：alter table 表名 modify 字段名 新类型 [新属性] [新位置] |
范例：使用modify修改字段类型
| 删除字段：alter table 表名 drop 字段名 |
范例：删除字段
11、删除表结构
| 基础语法：drop table 表名[,表名2…]，可以同时删除多个数据表 |
范例：删除表结构(单个删除)
范例：删除表结构(批量删除表)
