Pleak SQL constraint propagation This program is used to estimate the results of an SQL SELECT query given some approximate knowledge about table rows.

ALTER TABLE column_constraint specifies the properties of a PRIMARY KEY, FOREIGN KEY, UNIQUE, or CHECK constraint that is part of a new column definition added to a table. Is the name of the ...

Sql constraintsa constraint is a rule or limitation that we place on the data in a database that we can put into a column(s). a constraint is part of the table. we can apply constraints when we create ...