SQL - CASE Expressions
Why does the Simple CASE expression only allow comparing one expression to values, unlike the searched CASE expression?
Why does the Simple CASE expression only allow comparing one expression to values, unlike the searched CASE expression?
hard📝 Conceptual Q10 of 15
Step-by-Step Solution
Solution:
Step 1: Understand Simple CASE design
Simple CASE compares one expression to multiple values using equality.Step 2: Contrast with searched CASE
Searched CASE allows complex conditions, Simple CASE does not.Final Answer:
Because Simple CASE is designed for equality checks against one expression only -> Option DQuick Check:
Simple CASE = equality checks only [OK]
Quick Trick: Simple CASE only compares one expression for equality [OK]
Common Mistakes:
- Thinking Simple CASE supports complex conditions
- Assuming Simple CASE evaluates multiple expressions
- Believing ELSE is mandatory
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