SQL is the foundation of data engineering—and these five skills belong in every data engineer’s toolkit.
? JOIN ? Combine data across tables
? Window Functions ? Calculate ranks, running totals, and moving averages
? GROUP BY + HAVING ? Aggregate and filter results
? CTEs ? Write clearer, reusable queries
? CASE WHEN ? Add conditional logic to transformations
Master these SQL essentials to build cleaner queries and stronger data pipelines.
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Credit to : Coursera
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