This constraint ensures that whenever someone tries to add a new book or update an existing one, the number of pages must be a non-negative value example ALTER TABLE Books ADD CONSTRAINT ...

SQLite does not allow adding constraints to a table later. Adding foreign key constraints work really well on table creation ... Note that the uniqueConstraintName for the columns ...

Learn how to use CREATE TABLE, ALTER TABLE, and CONSTRAINT to create, modify, and view primary and foreign keys in SQL DB2 tables. Agree & Join LinkedIn ...

For example: CREATE TABLE tab ( a INT, b STRING ); ALTER TABLE tab ADD CONSTRAINT key_a_b UNIQUE (a, b); ALTER TABLE tab ADD CONSTRAINT... The predicate is silently ignored when using ALTER TABLE ...