// index.ts const coursesList = await db .select({ title: courses.title, tags: tags.tag }) .from(courseTags) .leftJoin(courses, eq(courses.id, courseTags.courseId)) .leftJoin(tags, eq(courseTags.tagId, tags.id)); actual output courses: [ { title: "Course 1", tags: "Tag 1" }, { title: "Course 2", tags: "Tag 2" }, { title: "Course 3", tags: "Tag 3" }, { title: "Course 1", tags: "tag 4" }, { title: "Course 1", tags: "tag 5" } ] desired output courses: [ { title: "Course 1", tags: ["Tag 1", "tag 4", "tag 5"] }, { title: "Course 2", tags: ["Tag 2"] }, { title: "Course 3", tags: ["Tag 3"] } ] `