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If you have a table with some sort of type column on it, you can come up with a count of the records in that table by type. You just need to take advantage of group by:

> select type, count(*) from pokemon group by type;

  type   | count
 fire    |    10
 water   |     4
 plant   |     7
 psychic |     3
 rock    |    12

Via jbranchaud/til.

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