amazon-redshiftHow do I use the CASE WHEN statement in Amazon Redshift?

The CASE WHEN statement is used to evaluate a set of conditions and return a result. It is similar to an IF-THEN-ELSE statement. In Amazon Redshift, the CASE WHEN statement is used to evaluate a set of conditions and return a result based on the conditions that are met.

For example, the following code will return either 'Pass' or 'Fail' depending on the value of the 'grade' column:

SELECT CASE WHEN grade >= 50 THEN 'Pass' ELSE 'Fail' END AS result
FROM table_name

The code consists of the following parts:

1. The CASE keyword, which starts the statement.
2. The WHEN keyword, which is followed by a condition.
3. The THEN keyword, which is followed by the result if the condition is met.
4. The ELSE keyword, which is followed by the result if the condition is not met.
5. The END keyword, which ends the statement.

For more information about the CASE WHEN statement in Amazon Redshift, please refer to the documentation.

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