By the end of this page you can predict, before you run it, how many rows any join will return. You will know all six join types and what each keeps. You will know the two ways a join goes wrong without ever raising an error, and the two counts that catch each one.

Source: [Dev.to](https://dev.to/michaelnocito/sql-joins-how-to-join-two-tables-without-losing-or-doubling-rows-422e)

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