Say we have two types of tools: hammers and wrenches. We have a list of work orders, and we want to track what tool was used for the hammering and what was used for the wrenching. The problem is that ...
CHECK ((user_id IS NULL AND article_id IS NOT NULL) OR (user_id IS NOT NULL AND article_id IS NULL)) );</pre>Each user or article may have many pictures, but they must have 1 or more featured pictures ...
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