Sharpen your SQL subquery super‑powers with this hands‑on, self‑contained practice set built around a fictional university. The project ships with an easy‑to‑load PostgreSQL script (Sub_query.sql) ...
This script demonstrates various subquery techniques in SQL. It covers result types, subqueries in the FROM clause, in SELECT, with comparison operators, IN, ANY, correlated subqueries, and EXISTS.
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