SQL Server CHECK Constraint
SQL Server Check Constraints restrict the values that are accepted by one or more columns.
3,005 total views, 2 views today
Home »
alter table drop constraint
SQL FOREIGN KEY Constraint
A foreign key is a key used to link two tables together. This is sometimes also called as a referencing key , usually a primary key table is considered as a parent table while a foreign key table is considered as a child table .
2,703 total views
SQL ALTER TABLE
SQL ALTER TABLE statement is used to modify the data type of a column , add a new column ,delete an old column from table and add a new constraints and remove an existing constraints on table.
2,553 total views, 5 views today