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CREATE TABLE users(user_id INT, first_name VARCHAR(100), gender INT)
CREATE TABLE user_services(user_id INT, image_id INT, description VARCHAR(100))
CREATE TABLE user_timeframe(user_id INT)
SELECT user_id, first_name, image_id, description, gender FROM users a JOIN user_services b ON b.user_id = a.user_id JOIN user_timeframe c ON c.user_id = a.user_id
Column 'user_id' in field list is ambiguous
SELECT user_id, first_name, image_id, description, gender FROM users a JOIN user_services b USING(user_id) JOIN user_timeframe c USING(user_id)