Question

Which data comes from the CASE transform to the default target?

Answer 1

The default target of a CASE transform in SQL is NULL if no conditions are met and an ELSE clause is not specified.

Step-by-step explanation:

The question refers to the CASE statement in SQL, which is used for conditional logic in queries. When mentioning the default target, it suggests what the output is when none of the conditions in the CASE expression are met. In a CASE statement, the ELSE clause is optional, but if it is not provided, and no condition is met, the default return value is NULL.

To illustrate, consider the following SQL snippet:

SELECT CASE WHEN condition1 THEN result1 WHEN condition2 THEN result2 ELSE default_result END FROM table_name;

In this example, if neither condition1 nor condition2 is met, the query will return default_result. If there's no ELSE clause and none of the conditions are satisfied, the CASE statement will return NULL by default.