Conditional Aggregation

CASE inside SUM replaces ten separate queries with one

CASE inside SUM replaces ten separate queries with one

Category

SQL

Difficulty

advanced

Duration

25 minutes

Challenges

0 hands-on challenges

Topics covered: When the Output Is a Pivot-Like Summary, SUM(CASE WHEN ... THEN 1 ELSE 0 END), FILTER (WHERE ...) Syntax and Dialect Differences, Nested Conditions and Multi-Level Pivots, Why This Replaces Subquery Spaghetti

Lesson Sections

1. When the Output Is a Pivot-Like Summary

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2. SUM(CASE WHEN ... THEN 1 ELSE 0 END)

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3. FILTER (WHERE ...) Syntax and Dialect Differences

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4. Nested Conditions and Multi-Level Pivots

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5. Why This Replaces Subquery Spaghetti

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