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Home Forums How can I write an IF...THEN in an SQL SELECT? – MindStick
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1 Answers

Aryan Kumar
Aryan Kumar 12 Jul 2023
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You can write an if then in an SQL select by using the CASE statement. The CASE statement allows you to execute different code depending on the value of a condition.

The syntax for writing an if then in an SQL select is as follows:

SQL

SELECT
  column1,
  column2,
  CASE
    WHEN condition1 THEN value1
    WHEN condition2 THEN value2
    ELSE value3
  END AS if_then_column
FROM table_name;

The column1, column2, etc. are the columns that you want to select. The condition1, condition2, etc. are the conditions that you want to check. The value1, value2, etc. are the values that you want to return if the condition is met. The if_then_column is the name of the new column that will be created.

For example, the following code will select the CustomerName column and the Country column from the Customers table. If the Country column is USA, then the if_then_column will be set to US Customer. Otherwise, the if_then_column will be set to Non-US Customer.

SQL

SELECT
  CustomerName,
  Country,
  CASE
    WHEN Country = 'USA' THEN 'US Customer'
    ELSE 'Non-US Customer'
  END AS if_then_column
FROM Customers;
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