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-- Step 1: Create an index on user_id to optimize searches for individual users CREATE INDEX idx_user_id ON user_interactions(user_id); -- Step 2: Create a sample post_data table to join with user_interactions CREATE TABLE post_data ( id INT PRIMARY KEY, content TEXT, created_at TIMESTAMP ); -- Step 3: Execute a join query with the optimized index to fetch user interactions and corresponding posts SELECT ui.*, pd.content FROM user_interactions ui JOIN post_data pd ON ui.post_id = pd.id WHERE ui.user_id = 12345;

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