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SELECT column_name(s)
FROM table_1
LEFT JOIN table_2
ON table_1.column_name = table_2.column_name;
An outer join will combine rows from different tables even if the join condition is not met. Every row in the left table is returned in the result set, and if the join condition is not met, then NULL values are used to fill in the columns from the right table
SUM
SELECT SUM(column_name)
FROM table_name;
SUM() is a function that takes the name of a column as an argument and returns the sum of all the values in that column.
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