**INNER:** Matching rows only. **LEFT:** All left + matches (NULL right where no match). **RIGHT:** All right + matches. **FULL:** All both, NULL where no match. **CROSS:** Cartesian product.
A(1,2), B(2,3). INNER:(2,2). LEFT:(1,null),(2,2). RIGHT:(2,2),(null,3). FULL:(1,null),(2,2),(null,3). CROSS: 6 rows....
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