IF-THEN-ELSE Statement

Oracle/PLSQL: IF-THEN-ELSE Statement

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There are three different syntaxes for these types of statements.

Syntax #1: IF-THEN

IF condition THEN
{...statements...}
END IF;

Syntax #2: IF-THEN-ELSE

IF condition THEN
{...statements...}
ELSE
{...statements...}
END IF;

Syntax #3: IF-THEN-ELSIF

IF condition THEN
{...statements...}
ELSIF condition THEN
{...statements...}
ELSE
{...statements...}
END IF;

Here is an example of a function that uses the IF-THEN-ELSE statement:

CREATE OR REPLACE Function IncomeLevel
( name_in IN varchar2 )
RETURN varchar2
IS
monthly_value number(6);
ILevel varchar2(20);

cursor c1 is
select monthly_income
from employees
where name = name_in;

BEGIN

open c1;
fetch c1 into monthly_value;
close c1;

IF monthly_value <= 4000 THEN ILevel := 'Low Income';

ELSIF monthly_value > 4000 and monthly_value <= 7000 THEN ILevel := 'Avg Income';

ELSIF monthly_value > 7000 and monthly_value <= 15000 THEN ILevel := 'Moderate Income';

ELSE
ILevel := 'High Income';

END IF;

RETURN ILevel;

END;

In this example, we've created a function called IncomeLevel. It has one parameter called name_in and it returns a varchar2. The function will return the income level based on the employee's name.