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How to create a new table in MySQL database

Mar 22, 2021 pm 04:16 PM
createmysql

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

  • #engineThe storage engine needs to be specified. Any storage engine can be used, such as: InnoDB, MyISAM, HEAP, EXAMPLE, CSV, ARCHIVE, MERGE, FEDERATED or NDBCLUSTER. If the storage engine is not explicitly declared, MySQL will use InnoDB 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_nameSpecify the name of the column . Each column has a specific data type and size , for example: varchar(50).

  • NOT NULL or NULL indicates whether the column accepts NULL values. The

  • DEFAULT value is used to specify the default value for the column.

  • AUTO_INCREMENTIndicates that the column's value is automatically incremented whenever a new row is inserted into the table. Each table has one and only one AUTO_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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