SQL · xAI · Medium
Imagine you are building an analytics layer for a chat product where users can create servers, browse them, join them, and send messages. The source system records these actions in four tables: server(server_id, creator_id, created_at) server_view(server_id, user_id, viewed_at) server_join(server_id, user_id, joined_at) message(message_id, server_id, channel_id, user_id, sent_at) A user may appear in the same event table multiple times; each row should be treated as one…
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