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select * from db db, host h
WHERE db.user='root' AND h.Host=db.Host AND h.Db=db.Db
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SELECT * FROM mysql.help_category h, help_category he
WHERE he.help_category_id=h.help_category_id
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SELECT * FROM mysql.help_category h, help_category he, help_category h0
WHERE he.help_category_id=h.help_category_id AND h0.help_category_id=h.help_category_id
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SELECT * FROM mysql.help_category h, help_category he, help_category h0, help_category h1
WHERE he.help_category_id=h.help_category_id AND h0.help_category_id=h.help_category_id AND h1.help_category_id=h.help_category_id
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