SQL40题解

• 问题描述：现在在last_update后面新增加一列名字为create_date, 类型为datetime, NOT NULL，默认值为'2020-10-01 00:00:00'

语法：

ALTER TABLE tbl_name
    [alter_option [, alter_option] ...]
    [partition_options]

alter_option: {
    table_options
  | ADD [COLUMN] col_name column_definition
        [FIRST | AFTER col_name]
  | ADD [COLUMN] (col_name column_definition,...)

本题代码：

ALTER TABLE actor ADD COLUMN (create_date DATETIME NOT NULL DEFAULT'2020-10-01 00:00:00');

或

ALTER TABLE actor ADD (create_date DATETIME NOT NULL DEFAULT'2020-10-01 00:00:00');

参考文文献：mysql官方文档13.1.9 ALTER TABLE Statementhttps://dev.mysql.com/doc/refman/8.0/en/alter-table.html