using a conditional update statement in sql

Question

I would like to have an update statement like this

 SELECT * from Employee
 WHERE age = CASE 
 WHEN (age < 20) THEN age=15
 WHEN (age > 20) THEN age=          


        

Answer 1

I think what you want is:

UPDATE EMPLOYEE
SET age =
CASE WHEN AGE < 20 THEN 15
ELSE 20 END

Answer 2

You can use a case statement in an update as follows...

UPDATE Employee 
SET Age = CASE WHEN (age < 20) THEN 15
              ELSE 20 END