SQL Syntax Lab
SELECT basic columns
Problem / task
You need a quick publisher-level impression check from daily stats before digging deeper.
Query to write
Select only publisher_id and impressions from daily_ad_stats.
Tables
- event_date
- DATE
- publisher_id
- VARCHAR
- app_name
- VARCHAR
- country
- CHAR(2)
- device_type
- VARCHAR
- impressions
- BIGINT
- ad_requests
- BIGINT
- revenue
- DECIMAL(12,4)
- country
- Two-letter country code such as US, CA, DE, or GB.
- device_type
- Example values: mobile, desktop, tablet, ctv.
Sample output
A simple projection returns only the requested columns.
| publisher_id | impressions |
|---|---|
| pub_123 | 124500 |
| pub_456 | 98210 |
Example
Notes
- SELECT chooses the columns you want to return.
- FROM tells SQL which table to query.
Related concepts
Practice editor
Type SQL here. Nothing is executed.
Drafts are stored in this browser for this example only. Syntax checking is optional and runs locally.
SQL practice guide
Practice SQL with AdTech data patterns
SQL Syntax Lab is built for repetition: choose an AdTech-focused example, read the pattern, hide it, and type it yourself until the syntax feels natural.
What you can practice
Work through SELECT statements, filtering, sorting, aggregation, joins, dates, text matching, subqueries, CTEs, and common ad-tech metrics such as CPM, fill rate, revenue, impressions, and VAST error counts.
Why the examples use AdTech
Practice is easier when the data looks like work: publishers, placements, bids, impressions, revenue, OpenRTB-style fields, VAST errors, and campaign troubleshooting questions.
How to use the lab
Start with beginner examples, copy the pattern once, reset the editor, then hide the example and rebuild it from memory. Mark completed examples when you want a cleaner practice list.
FAQ
Does SQL Syntax Lab run queries?
No. It is a syntax practice tool, not a production database or query runner. The editor is for safe repetition and local practice.
Is syntax checking required?
No. Syntax checking is optional so you can try writing the query first, then turn checking on when you want feedback.
Are drafts saved?
Drafts and completed examples are stored locally in your browser so you can practice over multiple sessions without creating an account.
Who is this for?
It is for ad ops, solutions, analytics, and engineering teams that want stronger SQL muscle memory using examples that feel like real ad-tech work.