constraints

sql

What is the difference between a unique key and primary key?...

NULL-values unique-key primary-key constraints

sql

SQL UNIQUE Constraint

unique-key primary-key constraints

sql

SQL PRIMARY KEY Constraint

NULL-values unique-key primary-key constraints

sql

Which of these is not a valid constraint?...

unique-key primary-key constraints CHECK-constraint NOT-NULL-constraint exists-constraint

sql

CHECK Constraint

constraints CHECK-constraint

sql

NOT NULL Constraint

NULL-values constraints NOT-NULL-constraint

sql

Given the students table which was created by the following SQL-query: ...

NULL-values constraints

sql

Select all types of column constraints (constraints that can be imposed on a col...