10 Questions
What type of constraint is applied to a single column only?
Primary Key
Which constraint ensures that a value cannot be NULL?
Primary Key
In database terminology, what does UNIQUE constraint prevent?
Inserting duplicate values
What does a Table Level Constraint affect?
Multiple columns
How many primary keys can a table have?
One and only one
What does a PRIMARY KEY consist of in a database table?
UNIQUE, NOT NULL, Automatic Indexed
Which constraint prevents the insertion of NULL values but allows duplicate values?
UNIQUE
What happens if a column has a DEFAULT constraint when no value is specified during INSERT?
The column gets the value specified in the DEFAULT clause
What does the CHECK constraint allow you to do in a database table?
Verify values against specified conditions
In a composite key, what is the significance of having more than one column as part of the key?
Combines multiple columns to uniquely identify a record
Learn about the various data constraints that can be enforced in a database table, including primary key, not null, unique, default, check, and foreign key constraints. Understand the classification of constraints as column level and table level constraints.
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