SQL Reference

SQL Cross Join - When we want to combine all rows of one table with all rows of another table.

"During March" means that the customer's starting month was in or before March and the final month was in or after March.

SELECT count (*)
FROM newspaper
WHERE start_month <=3
AND end_month >=3;

Cross join
SELECT (*)
FROM newspaper
CROSS JOIN months

Each customer is CROSS JOIN'ed with each month.

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