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SQL remains one of the most durable and universally useful technical skills, and the problem is that the course market for it is so full of shallow introductions that finding one with real depth takes some sorting. The SQL worth learning is the practical kind, the queries, joins, and aggregations you will write every day, and the course worth taking drills those on real data until they become second nature.The skill ladder starts with the basics, the select, the where, the joins, the group by, which cover the majority of what most jobs require, and a good course takes you through these with increasingly complex problems rather than toy examples. The next level adds the window functions, the subqueries, and the performance thinking, the indexing, the query plans, that separate a competent query writer from someone who merely knows the syntax, and these are the skills that show up in interviews and in real production
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