MySQL provides both
CASE statements to enable you to execute a block of SQL code based on certain conditions, which is known as flow control. So what statement should you use? For the most developers, choosing between
CASE is just a matter of personal preference. However, when you decide to use
CASE , you should take the following points into the consideration:
- A simple CASE statement is more readable than the IF statement when you compare a single expression against a range of unique values. In addition, the simple
CASEstatement is more efficient than the
- When you check complex expressions based on multiple values, the
IFstatement is easier to understand.
- If you choose to use the
CASEstatement, you have to make sure that at least one of the
CASEcondition is matched. Otherwise, you need to define an error handler to catch the error. Recall that you don’t have to do this with the
- In most organization, there is always something called development guidelines document that provides developers with naming convention and guidelines on programming style. You should refer to this document and follow the development practices.
- In some situations, mixing between
CASEmake your stored procedure more readable and efficient.