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Ask HN: SQL Help
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?
- rawgabbit 6y agoYou 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-between-using-left-join-or-not-exists https://dba.stackexchange.com/questions/121034/best-practice...
- murilogustineli 6y agoThat helps! Thank you!