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What does the CASE statement do in a SQL SELECT query?

easy📝 Conceptual Q11 of 15
SQL - CASE Expressions
What does the CASE statement do in a SQL SELECT query?
ACreates a new column with values based on conditions
BDeletes rows that do not meet a condition
CJoins two tables together
DSorts the results in ascending order
Step-by-Step Solution
Solution:

  1. Step 1: Understand the purpose of CASE in SELECT

    The CASE statement is used to create new columns by checking conditions and assigning values accordingly.

  2. Step 2: Compare with other SQL operations

    Deleting rows is done with DELETE, joining tables with JOIN, and sorting with ORDER BY, not CASE.

  3. Final Answer:

    Creates a new column with values based on conditions -> Option A

  4. Quick Check:

    CASE = computed column based on conditions [OK]
Quick Trick: CASE creates conditional columns in SELECT queries [OK]
Common Mistakes:
  • Thinking CASE deletes rows
  • Confusing CASE with JOIN
  • Assuming CASE sorts data

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