Created
May 16, 2013 01:33
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Sub query counts
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| // table called categories, with an id and a parent_category_id | |
| // useful for counting number of subcategories per parent category | |
| SELECT *, | |
| (SELECT count(*) FROM categories c1 where c1.id=categories.parent_category_id) | |
| as TheCount FROM `categories` |
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