Im a new grad BI analyst but never use SQL. We use DOMO as our main BI tool here and they have a GUI-based SQL function thats just incredibly convenient but I feel my lack of practice in SQL will hurt when trying to jump company later on. Any BI analysts here can give their input?
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Entry level is probably select where having joins subquery, derived tables, keys, data types, union vs intersect vs union all vs minus and minus all. Least Id ask entry level those questions.
More advanced is correlated subqueries and why not to use them, sql optimizing, proper indexing, sliding windows, ordered analytics (rank vs dense rank vs rownum),CTE when to use them. Etc. Hash partitioning vs round robin partition blah. Blah
Being an ass is printing off a long explain plan. Lol