MySQL函数GROUP_CONCAT() 实现多条数据合并

group_concat()会计算哪些行属于同一组，将属于同一组的列显示出来，group by指定的列进行分组。

例如：

    -- 根据物流订单id查询所有物流订单，车源订单，车辆信息(多条数据合并为一条数据，英文逗号隔开)
        SELECT
            a.id AS logisOrderId,
            a.logistics_order_code AS logisOrderCode,
            a.logis_order_sum_fee AS logisOrderSumFee,
            GROUP_CONCAT(b.id) AS carSourceOrderId,
            b.start_city_name AS startCityName,
            b.end_city_name AS endCityName,
            b.start_city_id AS startCityId,
            b.end_city_id AS endCityId,
            GROUP_CONCAT(b.buyer_id) AS buyerId,
            GROUP_CONCAT(b.buyer_name) AS buyerName,
            GROUP_CONCAT(b.buyer_phone) AS buyerPhone,
            GROUP_CONCAT(c.id) AS carSourceOrderItemId,
            GROUP_CONCAT(d.car_brand) AS carBrand,
            GROUP_CONCAT(d.car_type) AS carType,
            GROUP_CONCAT(d.colour) AS carColor,
            sum(c.insurance_fee) AS insuranceSumFee,
            sum(c.actual_fee) AS actualSumFee,
            GROUP_CONCAT(d.car_id) AS carId
        FROM
            t_ims_logistics_order a
          LEFT JOIN t_ims_carsource_order b ON a.id=b.logistics_order_id
          LEFT JOIN t_ims_carsource_order_item c ON  b.id = c.car_source_order_id
          LEFT JOIN t_ims_car d ON c.logistics_car_id = d.id
        WHERE  
         a.id=11
        GROUP BY a.id

 合并前：两条数据

 合并后：一条数据

链接：https://blog.csdn.net/mary19920410/article/details/76545053