The SQL (Structured Query Language) is one of the most important skills of a programmer. I would rate this skill similar to UNIX if you are a professional programmer because it doesn't matter whether you are Java, C++, or a .NET developer, you are bound to write SQL queries. Since a database is an integral part of any modern Java or Web application, Interviewer always preferred candidates with good SQL skills. Now, the big question comes, how a programmer can learn SQL? Does just knowing how to query a table is enough? If you know insert, update, delete, and select then are you a competent SQL programmer? What about indexes, query plans, triggers, views, stored procedures and other advanced SQL concepts? What about writing complex queries involving joins, subqueries, derived tables etc? Well, all those are very important to be a competent full stack developer.
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