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CREATE TABLE lesson_students ( lesson_id integer, student_id integer, visit boolean DEFAULT false ); CREATE TABLE students ( id integer NOT NULL, name character varying(10) ); SELECT json_agg( SELECT json_build_object('id', s.id,'name', s.name, 'visit', lesson_students.visit) FROM lesson_students JOIN students s on lesson_students.student_id = s.id WHERE lesson_students.lesson_id = 8) AS t;
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