CREATE TABLE syntax:
CREATE TABLE [IF NOT EXISTS] table_name( column_list ) engine=table_type;
[IF NOT EXISTS]
Mainly used to determine whether the newly created table exists
#engine
The storage engine needs to be specified. Any storage engine can be used, such as:InnoDB
,MyISAM
,HEAP
,EXAMPLE
,CSV
,ARCHIVE
,MERGE
,FEDERATED
orNDBCLUSTER
. If the storage engine is not explicitly declared,MySQL
will useInnoDB
by default.column_list
is more complex and is a list of specified tables. Columns of fields are separated by commas (,).
The syntax of column_list is as follows:
column_name data_type[size] [NOT NULL|NULL] [DEFAULT value] [AUTO_INCREMENT]
column_name
Specify the name of the column . Each column has a specificdata type
andsize
, for example: varchar(50).NOT NULL
orNULL
indicates whether the column acceptsNULL
values. TheDEFAULT
value is used to specify the default value for the column.AUTO_INCREMENT
Indicates that the column's value is automatically incremented whenever a new row is inserted into the table. Each table has one and only oneAUTO_INCREMENT
column.
Example:
CREATE TABLE tasks ( id INT NOT NULL, subject VARCHAR(45) NULL, start_date DATE NULL, end_date DATE NULL //注意此处不能有"," 会报错 )charset utf8;
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