[musiccog]

Absolutely agree with mastering SQL.

Out of all of the languages I have learned over the years, only one has stayed important in every job and mostly static - SQL

There are many languages and libraries, but at this moment in time, all of them have to talk to a database at some stage, and in order to do that all of them convert the request to SQL.

[markus_zhang]

Yeah true. As a business analyst I have queried many databases, but SQL doesn't change (much), and the dialects share a common base, even for the cloud based ones. My bread and butter.