SQL Server Course for Beginners with 100+ examples - Aliases

The video tutorial explains the use of check constraints in SQL, which are used to restrict the values that can be inserted into a column. It provides examples of setting constraints for age and salary records, demonstrating how to create a table with these constraints. The tutorial also shows how to insert records, handle errors when constraints are violated, and correct these errors by re-inserting valid records. The focus is on ensuring data integrity by using check constraints effectively.

What is the primary purpose of a check constraint in SQL?

• To delete records that do not meet certain criteria

• To automatically update values in a column

• To restrict the values that can be inserted into a column

• To allow any value to be inserted into a column

In the example provided, what is the maximum salary allowed by the check constraint?

• 10,000

• 5,000

• 20,000

• 15,000

Which SQL command is used to display all records from a table?

• LIST ALL FROM table_name

• SELECT * FROM table_name

• SHOW ALL FROM table_name

• DISPLAY * FROM table_name

What happens when you try to insert a record that violates a check constraint?

• The record is inserted but the violating value is set to NULL

• An error is generated and the record is not inserted

• The record is inserted without any issues

• The record is inserted with a warning

How can you resolve an error caused by a check constraint violation?

• By ignoring the error

• By deleting the check constraint

• By restarting the database

• By changing the value to meet the constraint