27 lines
428 B
Plaintext
27 lines
428 B
Plaintext
The requirement for a final ``ELSE`` clause is defensive programming. The ``CASE`` expression should always provide a value.
|
|
|
|
== Noncompliant Code Example
|
|
|
|
----
|
|
SELECT
|
|
CASE category
|
|
WHEN 'A' THEN 21
|
|
WHEN 'B' THEN 33
|
|
END shipping_cost
|
|
FROM product
|
|
----
|
|
|
|
== Compliant Solution
|
|
|
|
----
|
|
SELECT
|
|
CASE category
|
|
WHEN 'A' THEN 21
|
|
WHEN 'B' THEN 33
|
|
ELSE 42
|
|
END shipping_cost
|
|
FROM product
|
|
----
|
|
|
|
include::../see.adoc[]
|