PL/SQL supports the programming language features like conditional statements and iterative statements. Its programming constructs are similar to how you use in programming languages like Java and C++.
Syntax for IF Statement:
There are different syntaxes for the IF-THEN-ELSE statement.
Syntax: (IF-THEN statement):
This syntax is used when you want to execute statements only when condition is TRUE.
Syntax: (IF-THEN-ELSE statement):
This syntax is used when you want to execute one set of statements when condition is TRUE or a different set of statements when condition is FALSE.
Syntax: (IF-THEN-ELSIF statement):
This syntax is used when you want to execute one set of statements when condition1 is TRUE or a different set of statements when condition2 is TRUE.
Syntax: (IF-THEN-ELSIF-ELSE statement):
When a condition is found to be TRUE, the IF-THEN-ELSE statement will execute the corresponding code and not check the conditions any further.
If there no condition is met, the ELSE portion of the IF-THEN-ELSE statement will be executed.
ELSIF and ELSE portions are optional.
Example of PL/SQL If Statement
Let's take an example to see the whole concept:
After the execution of the above code in SQL prompt, you will get the following result:
a is not less than 20 value of a is : 500 PL/SQL procedure successfully completed.