Merge pull request #344 from HrishiDhondge/main

SQL-446: How to SUM DISTINCT Rows in SQL

Author: xaeldung

sql-queries-11/sum-distinct-rows/distinct-within-subquery.sql

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+SELECT SUM(credits) FROM (SELECT DISTINCT textbook, credits FROM Course) AS distinct_rows;
+SELECT SUM(credits) AS distinct_credits FROM (SELECT DISTINCT textbook, credits FROM Course) AS distinct_rows;

sql-queries-11/sum-distinct-rows/sum-with-cte.sql

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+WITH unique_textbooks AS (SELECT DISTINCT textbook, credits FROM Course) SELECT SUM(credits) FROM unique_textbooks;

sql-queries-11/sum-distinct-rows/union-within-subquery.sql

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+SELECT SUM(credits) AS distinct_credits FROM (SELECT textbook, credits FROM Course UNION SELECT textbook, credits FROM Course) AS combined;
+SELECT textbook, credits FROM Course UNION SELECT textbook, credits FROM Course;