SQL-SQL Server-添加具有默认值和检查约束的列

Posted 2021-02-24

Example of SQL syntax to add a new column to an existing table, define a default value to the columns for the existing rows and also add a check constraint to limit the values that the column can hold.

ALTER TABLE
	GhibliMovies
ADD
	Director VARCHAR(255) NULL
CONSTRAINT
	director_check CHECK (Director IN ('Hayao Miyazaki', 'Isao Takahata', 'Yoshifumi Kondo', 'Goro Miyazaki', 'Hiromasa Yonebayashi'))
DEFAULT
	'Hayao Miyazaki' WITH VALUES;