To create a table column which should not accept blank values, which of the following can be used?

What does MID() function do?

What keyword is used to filter values obtained by applying aggregate functions in the query results using GROUP BY clause?

Assuming there are multiple rows in the 'Commission_Agents' table with entries for commission agents from different departments, what is the error in the following query:

SELECT name, department_id, commission_percentage from Commision_Agents 

WHERE commission_percentage = (SELECT min(commission_percentage)  FROM Commision_Agents GROUP BY department_id);

What is the difference between CHAR and VARCHAR data types?

Which of the following operators can not be used in the 'WHERE' clause?

What is the correct syntax for using a CASE statement?

Where can we find subquery within another statement?

Which type of join will yield a Cartesian product?

Must CASE statements always be indented?

What is an alternate way of writing the following statement: WHERE "column_name" IN ('value1')