MySQL IF Statement in SELECT Queries

In MySQL, you can use the SELECT IF statement for conditional judgment and selection. The syntax of the SELECT IF statement is as follows:

Retrieve a value based on a condition from a specific table.

In this case, condition is a conditional expression, value_if_true is the value to return when the condition is true, value_if_false is the value to return when the condition is false, and table_name is the name of the table from which to select data.

Here is an example of using the SELECT IF statement:

Suppose there is a table named “students” with fields id, name, and age. We want to determine if a student is an adult based on their age. If they are an adult, return “adult”; otherwise, return “minor”.

Choose the ID and name of students, and categorize them as “Adult” or “Minor” based on their age.

This statement will return a result set that includes the id, name, and is_adult fields. The value of the is_adult field is determined based on the value of the age field: if the age is equal to or greater than 18, it will return “adult”, otherwise it will return “minor”.

I hope this example can help you understand how to use the SELECT IF statement in MySQL.