IF-ELSE in procedures in SQL - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of IF-ELSE statements in SQL procedures?

IF-ELSE statements allow the procedure to make decisions and execute different code blocks based on conditions, similar to choosing different paths in real life depending on a situation.

beginner

Write the basic syntax of an IF-ELSE statement inside a SQL procedure.

IF condition THEN<br>   -- statements to run if condition is true<br>ELSE<br>   -- statements to run if condition is false<br>END IF;

intermediate

Can you use multiple ELSE IF conditions in SQL procedures? How?

Yes, you can use multiple ELSE IF (or ELSIF) to check several conditions one after another. For example:<br>IF condition1 THEN<br>   -- code<br>ELSIF condition2 THEN<br>   -- code<br>ELSE<br>   -- code<br>END IF;

beginner

Why are IF-ELSE statements useful in stored procedures?

They let procedures react differently depending on input or data, like a traffic light changing signals. This makes procedures flexible and powerful for many tasks.

beginner

What happens if no condition in an IF-ELSE chain is true and there is no ELSE block?

No code inside the IF-ELSE block runs. The procedure just continues after the END IF statement.

Which keyword starts an IF-ELSE statement in SQL procedures?

A WHEN

B SELECT

C CASE

D IF

IF is the keyword used to start an IF-ELSE conditional block in SQL procedures.

What keyword ends an IF-ELSE block in SQL procedures?

A STOP

B END IF

C FINISH

D END

END IF marks the end of an IF-ELSE block in SQL procedures.

How do you check multiple conditions in sequence inside a procedure?

A Use ELSE IF or ELSIF between IF and ELSE

B Use multiple IF statements without ELSE

C Use CASE statement only

D Use SELECT statements

Multiple conditions are checked using ELSE IF (or ELSIF) between IF and ELSE.

What happens if the IF condition is false and there is no ELSE block?

A The procedure stops with error

B The code inside IF runs anyway

C No code inside IF-ELSE runs, procedure continues

D The procedure restarts

If no condition is true and no ELSE block exists, no code inside IF-ELSE runs; procedure continues.

Which of these is NOT a valid part of IF-ELSE syntax in SQL procedures?

A ELSEIF condition THEN

B ELSE

C ELSIF condition THEN

D IF condition THEN

The correct keyword is ELSIF, not ELSEIF.

Explain how IF-ELSE statements control the flow inside SQL procedures.

Think about how you choose actions based on yes/no questions.

Describe the syntax and use of multiple conditions in IF-ELSE statements within procedures.

Imagine checking several options one by one.