/courses/sql/summarizing-data-with-sql/Recent content in Summarizing Data with SQL on DATATWEETSHugoenCopyright (c) 2025 DatatweetsTue, 23 Jun 2026 09:00:00 +0200/courses/sql/summarizing-data-with-sql/lesson-1-aggregate-functions-count-sum-avg-and-more/Fri, 14 Nov 2025 09:00:00 +0200/courses/sql/summarizing-data-with-sql/lesson-1-aggregate-functions-count-sum-avg-and-more/Meet SQL’s five core aggregate functions and learn to collapse an entire column into a single summary value like a total, average, minimum, maximum, or count./courses/sql/summarizing-data-with-sql/lesson-2-building-summary-statistics/Fri, 14 Nov 2025 09:00:00 +0200/courses/sql/summarizing-data-with-sql/lesson-2-building-summary-statistics/Compute several statistics at once, run aggregates over computed columns, wrap them in scalar functions like ROUND, and summarize only the rows that meet a condition./courses/sql/summarizing-data-with-sql/lesson-3-grouping-data-with-group-by/Fri, 14 Nov 2025 09:00:00 +0200/courses/sql/summarizing-data-with-sql/lesson-3-grouping-data-with-group-by/Use the GROUP BY clause to split a table into groups and compute aggregate statistics for each one, then combine grouping with WHERE and ORDER BY./courses/sql/summarizing-data-with-sql/lesson-4-grouping-by-multiple-columns-and-filtering-groups/Fri, 14 Nov 2025 09:00:00 +0200/courses/sql/summarizing-data-with-sql/lesson-4-grouping-by-multiple-columns-and-filtering-groups/Group rows by several columns to create finer breakdowns, then use the HAVING clause to filter on aggregated values that WHERE cannot touch.