Question

我正在尝试从匹配的两个表中获取值。

预订表：

 id, member_id, salon_id, service_id, appointment_date, booking_date
  1,         5,        2,          1,       2015-08-29,   2015-08-29
  2,         5,        2,          2,       2015-08-29,   2015-08-29
  3,         5,        3,          3,       2015-08-29,   2015-08-29
  4,         5,        3,          4,       2015-08-29,   2015-08-29

服务表：

 service_id, salon_id, service_name, price
          1,        2, Make-Up     , 25
          2,        2, Hair Styling, 10
          3,        3, Waxing      , 15
          4,        3, Threading   , 20

当前查询：

SELECT b.salon_id 
     , s.service_id
     , s.price
     , b.booking_date 
  FROM bookings b
  JOIN services s
    ON b.salon_id = s.salon_id 
   AND b.salon_id = 2 
   AND b.booking_date = '2015-08-29';

当前结果：

  salon_id, service_id, price, booking_date
         2,          1,    25,   2015-08-29
         2,          1,    25,   2015-08-29
         2,          2,    10,   2015-08-29
         2,          2,    10,   2015-08-29

预期结果：

 salon_id, service_id, price, booking_date
        2,          1,    25, 2015-08-29
        2,          2,    10, 2015-08-29

我想做的是。我想要具体日期的所有特定沙龙预订。在那之后，我将总结价格以获得特定日期沙龙的总销售额。

请帮忙吗？

提前致谢。

Answer 1

尝试DISTINCT：

SELECT DISTINCT bookings.salon_id, services.service_id, services.price,
bookings.booking_date FROM bookings INNER JOIN services ON
bookings.salon_id=services.salon_id AND bookings.salon_id = 2 AND
bookings.booking_date = '2015-08-29';

Answer 2

我认为您还需要加入服务ID的条件：

SELECT b.salon_id, s.service_id, s.price, b.booking_date
FROM bookings b INNER JOIN
     services s
     ON b.salon_id = s.salon_id AND
        b.service_id = s.service_id
WHERE b.salon_id = 2 AND
      b.booking_date = '2015-08-29';

还要注意表别名如何使查询更容易编写和阅读。

Answer 3

尝试此查询：

SELECT bookings.salon_id, services.service_id, services.price,bookings.booking_date 
FROM bookings 
LEFT JOIN services ON bookings.salon_id=services.salon_id AND bookings.service_id = services.service_id;

此查询将显示服务中存在的预订数据。

bookings.salon_id = services.salon_id AND bookings.salon_id = 2 AND bookings.booking_date =＆＃39; 2015-08-29＆＃39; ;

使您的查询不动态。如果你想获得1号或2号或3号或全部的沙龙_？

MYSQL - 在匹配时从两个表中获取值

3 个答案: