SQL SQRT
Returns the square root of a number — the inverse of POWER(n, 2), and a common building block in statistical calculations like standard deviation.
What & Why
SQRT(n) returns the square root. Beyond simple math, this shows up constantly in statistical formulas — standard deviation is literally defined as the square root of variance.
See How It Works
BUSINESS QUESTION
Marketing wants the square-root transform of campaign spend for exploratory analysis.
| 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,
spend,
ROUND(SQRT(spend), 2) AS sqrt_spend
FROM marketing.campaigns
WHERE spend >= 0
ORDER BY campaign_id;RESULT — exact output from the displayed Queryflo rows
| campaign_id | spend | sqrt_spend |
|---|---|---|
| 1 | 55000.00 | 234.52 |
| 2 | 45000.00 | 212.13 |
| 3 | 50000.00 | 223.61 |
| 4 | 60000.00 | 244.95 |
SQRT returns the rounded transform of each non-negative campaign spend.
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