SQL Extract an Email Domain
A specific, common application of SPLIT_PART — pulling out just the company/provider portion of an email address.
What & Why
Grouping users by email domain — a common way to spot company-wide signups, or filter out free providers like gmail.com — needs exactly the SPLIT_PART(email, '@', 2) pattern from earlier in this series, applied directly.
See How It Works
BUSINESS QUESTION
Marketing wants lead counts by normalized email domain.
| id | campaign_id | created_at | qualified_at | converted_at | lead_score | source | country | |
|---|---|---|---|---|---|---|---|---|
| 301 | 1 | ana@example.com | 2024-01-21 09:10:00+00 | 2024-01-22 11:00:00+00 | 2024-02-02 10:00:00+00 | 86 | google_ads | US |
| 302 | 1 | ben@example.com | 2024-01-24 12:40:00+00 | NULL | NULL | 52 | google_ads | CA |
| 303 | 2 | chloe@example.com | 2024-02-16 08:30:00+00 | 2024-02-18 14:20:00+00 | NULL | 74 | GB | |
| 304 | 3 | dev@example.com | 2024-03-20 17:15:00+00 | 2024-03-21 09:00:00+00 | 2024-04-04 16:00:00+00 | 91 | US |
EXAMPLE QUERY
SELECT
LOWER(SPLIT_PART(email, '@', 2)) AS email_domain,
COUNT(*) AS leads
FROM marketing.leads
WHERE POSITION('@' IN email) > 1
GROUP BY email_domain
ORDER BY leads DESC, email_domain;RESULT — exact output from the displayed Queryflo rows
| email_domain | leads |
|---|---|
| example.com | 4 |
All four valid displayed lead emails share the example.com domain.
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