Ask HN: SQL Help

1 points by murilogustineli 6y ago ↗ HN

I work for a company where a new feature will be launched. Let's call the existing feature A and the new feature B. We want to track the adoption of new users for the new feature B. Using SQL, how can I get the new account ids for the new feature B that have no usage on existing feature A. In other words, how can I get the new account that are being signed up for feature B that do not signed up for feature A?

2 comments

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rawgabbit 6y ago ↗

You can do this

SELECT B.* FROM tableB B LEFT JOIN tableA A ON A.key1= B.key1 and A.key2=B.key2 WHERE A.key1 IS NULL

Or use NOT EXISTS depending on the database you use.

https://dba.stackexchange.com/questions/121034/best-practice...

murilogustineli 6y ago ↗

That helps! Thank you!