What is it
Undergraduate SQL extends GCSE-level querying to complex joins, subqueries, window functions, and query optimisation, along with writing efficient queries against large, real-world database schemas.
Why it matters
SQL remains the standard language for interacting with relational databases across virtually every industry, and the ability to write efficient, correct queries against large datasets is one of the most consistently in-demand technical skills in the job market.
Exam tip
When a query runs slowly, check whether it's using indexes effectively before assuming the query logic itself is wrong — a logically correct query without proper indexing can be orders of magnitude slower than the same query with the right index in place.
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