Answers for "sum mysql group by"

mysql sum group by

-- SELECT SUM(<column_name>) FROM <table_name> WHERE <condition>;
SELECT SUM(amount) FROM invoices;
SELECT client_name, SUM(amount) FROM invoices GROUP BY client_name;

mysql sum with group by

-- Sum Columns only show up in SELECT statement 
-- All other columns must be in both
SELECT categories_column, SUM(units_column) AS total_units
FROM schema.table
GROUP BY categories_column;