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Which statement is used to force the optimizer to use tables in a particular order?

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Which statement is used to force the optimizer to use tables in a particular order?

(a) FORCE INDEX

(b) USE INDEX

(c) IGNORE INDEX

(d) STRAIGHT_JOIN

I have been asked this question during an online interview.

The question is from MySQL Query Optimizer topic in portion Query Optimization of MySQL

1 Answer

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Right answer is (d) STRAIGHT_JOIN

For explanation I would say: STRAIGHT_JOIN is used to force the optimizer to use tables in a particular order. The MySQL optimizer by default considers itself free to determine the order in which to scan tables most quickly.

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