SQL MAX OVER
The mirror of MIN OVER — the largest value in the window, on every row.
What & Why
MAX(column) OVER (PARTITION BY ...) finds each partition's largest value and repeats it on every row — same mechanics as MIN OVER, opposite direction.
See How It Works
BUSINESS QUESTION
Marketing wants each campaign beside the maximum spend in its channel.
| id | name | channel | spend | start_date | end_date | status | target_segment |
|---|---|---|---|---|---|---|---|
| 1 | Spring Launch | google_ads | 55000.00 | 2024-01-15 | 2024-03-31 | active | smb |
| 2 | Retention Webinar | 45000.00 | 2024-02-10 | 2024-04-15 | active | enterprise | |
| 3 | Finance Retargeting | 50000.00 | 2024-03-12 | 2024-05-31 | active | enterprise | |
| 4 | Enterprise Search | google_ads | 60000.00 | 2024-04-01 | 2024-06-30 | active | enterprise |
EXAMPLE QUERY
SELECT
id AS campaign_id,
channel,
spend,
MAX(spend) OVER (PARTITION BY channel) AS channel_max_spend
FROM marketing.campaigns
ORDER BY channel, campaign_id;RESULT — channel maximum beside campaigns
| campaign_id | channel | spend | channel_max_spend |
|---|---|---|---|
| 2 | 45000.00 | 45000.00 | |
| 1 | google_ads | 55000.00 | 60000.00 |
| 4 | google_ads | 60000.00 | 60000.00 |
| 3 | 50000.00 | 50000.00 |
MAX OVER uses the highest spend in each channel partition.
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