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English Casual
I started to use MongoDB
         2012/05/10
           riywo
Developing Web App
❖   I wanted to build a Web App

❖   Renewal of Management Tool

    ❖   High performance is unnecessar...
SELECT u.name, c.name, a.code ...
FROM users u
LEFT JOIN map USING(user_id)
LEFT JOIN classes c USING(class_id)
LEFT JOIN ...
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