How many records are returned by the SQL join?
💡 Model Answer
The number of records returned by a SQL join depends on the type of join and the data in the participating tables. For an INNER JOIN, only rows that satisfy the join condition in both tables are returned, so the count is limited by the smaller matching set. A LEFT (or RIGHT) JOIN returns all rows from the left (or right) table, plus matching rows from the other table; unmatched rows appear with NULLs for the missing side. A FULL OUTER JOIN returns all rows from both tables, with NULLs where there is no match. CROSS JOIN returns the Cartesian product, multiplying the row counts of the two tables. To determine the exact count, you can run:
SELECT COUNT(*) FROM tableA JOIN tableB ON tableA.id = tableB.a_id;
Adjust the join type and condition to match your query.
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