SQL - CASE Expressions
Which keyword is used to start a conditional expression inside a SELECT statement to compute new column values?
Which keyword is used to start a conditional expression inside a SELECT statement to compute new column values?
easy📝 Conceptual Q2 of 15
Step-by-Step Solution
Solution:
Step 1: Identify the keyword for conditional logic in SELECT
The CASE keyword starts a conditional expression to compute values based on conditions.Step 2: Understand other keywords
WHERE filters rows, GROUP BY groups rows, ORDER BY sorts rows; none compute conditional columns.Final Answer:
CASE -> Option DQuick Check:
Conditional expressions in SELECT start with CASE [OK]
Quick Trick: Use CASE to start conditional expressions in SELECT [OK]
Common Mistakes:
- Using WHERE instead of CASE for computed columns
- Confusing GROUP BY with conditional logic
- Using ORDER BY to compute values
Master "CASE Expressions" in SQL
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