What types of joins do you know?
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(INNER) JOIN – returns only those records that satisfy a defined join condition in both (or all) tables. It’s a default SQL join.
LEFT (OUTER) JOIN – returns all records from the left table and those records from the right table that satisfy a defined join condition.
RIGHT (OUTER) JOIN – returns all records from the right table and those records from the left table that satisfy a defined join condition.
FULL (OUTER) JOIN – returns all records from both (or all) tables. It can be considered as a combination of left and right joins.