-- case 1: whenever we have an unknown present in the question -- case 2: whenever the data to be selected and the condition to be excuted are present in different table we use subquery ...
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.
Follow this step-by-step guide to install PostgreSQL, load data, connect to a database, and execute SQL queries including table joins PostgreSQL is an open-source, object-relational (also called ...
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