The CHECK constraint is used to limit the value range that can be placed in a column.The SQL CHECK constraint ensures that all values in a column satisfy certain conditions,If you define a CHECK constraint on a single column it allows only certain values for this column.If you define a CHECK constraint on a table it can limit the values in certain columns based on values in other columns in the row.
CREATE TABLE newitems (
newitem_num INTEGER CHECK (newitem_num > 10),
manucode CHAR(3) NOT NULL,
promotype INTEGER,
descrip CHAR(20))
Share This Post
No comments:
Write comments