基于 SQL 查询生成 JSON

Question

您好，我想生成这样的 JSON 输出

{
    "cars": {
        "ferrari": {
           "colors": ["green", "red"]
        },
        "porsche": {
            "colors": ["blue", "yellow"]
        }
    }
}

我有 2 个 Mysql 表：

cars: (id, name) and colors: (id, color, brand_id)

我知道的唯一方法是例如

SELECT * FROM brands
and then...
SELECT * FROM colors WHERE car_id = ? 
to get all the cars colors

仅在一个查询中就可以做到这一点吗？

Answer 1

我假设车名就是品牌。你应该做： cars(id, brand), colors(id, color) 和 cars_colors(id_brand, id_color) 然后： SELECT brand, color FROM (cars JOIN cars_colors ON cars.id = cars_colors.id_brand) JOIN colours ON cars_colors.id_color = colors.id;