What is an index key?

COBOL SQL Interview Questions

(Continued from previous question...)

What is an index key?

It is a column or set of columns in a table used to determine the order of index entries.

(Continued on next question...)

Other Interview Questions

• Where in a table are added column located ?
• When do you use a LINK statement ?
• What is referential integrity?
• What do you accomplish by GROUP BY ... HAVING clause ?
• What are foreign keys?
• How do you concatenate the FIRSTNAME and LASTNAME from EMP table to give a complete name?
• What is meant by null?
• What is UNION, UNION ALL?
• Is DECLARE CURSOR executable?
• What is the result of this query if no rows are selected: SELECT SUM(SALARY) FROM EMP WHERE QUAL='MSC'; ?
• More...