MySQL的左连接，GROUP BY，计数和UNION ALL

继承人我查询MySQL的左连接，GROUP BY，计数和UNION ALL

SELECT 
    fsi_courier_assignment_print_master_listing.master_listing_id, 
    fsi_master_listing.transmittal_id, 
    fsi_transmittals.product_name, 
    fsi_transmittals.transmittal_id 
FROM fsi_courier_assignment_print_master_listing 
LEFT JOIN fsi_master_listing ON fsi_courier_assignment_print_master_listing.master_listing_id = fsi_master_listing.master_listing_id 
LEFT JOIN fsi_transmittals ON fsi_master_listing.transmittal_id = fsi_transmittals.transmittal_id 
WHERE dispatch_code_id=".$this->db->escape($dispatch_code_id)." 
UNION ALL 
SELECT 
    fsi_courier_assignment_print_master_listing_undelivered.master_listing_id, 
    fsi_master_listing.transmittal_id, 
    fsi_transmittals.product_name, 
    fsi_transmittals.transmittal_id 
FROM fsi_courier_assignment_print_master_listing_undelivered 
LEFT JOIN fsi_master_listing ON fsi_courier_assignment_print_master_listing_undelivered.master_listing_id = fsi_master_listing.master_listing_id 
LEFT JOIN fsi_transmittals ON fsi_master_listing.transmittal_id = fsi_transmittals.transmittal_id 
WHERE dispatch_code_id=".$this->db->escape($dispatch_code_id)."

fsi_courier_assignment_print_master_listing表

master_listing_id dispatch_code_id 
      2     2 
      5     2 
      36    2 
      37    2 
      134    2 
      135    2 
      136    2 
      137    2 
      138    2 
      139    2 
      140    2

fsi_courier_assignment_print_master_listing_undelivered表

master_listing_id dispatch_code_id 
      1     2

fsi_master_listing表

master_listing_id transmittal_id 
      1     1 
      2     1 
      5     2 
      36    2 
      37    2 
      134    3 
      135    3 
      136    3 
      137    3 
      138    3 
      139    3 
      140    3

fsi_transmittals表

transmittal_id product_name 
     1    Name 1 
     2    Name 2 
     3    Name 3

什么进出口试图做的是从fsi_courier_assignment_print_master_listing和fsi_courier_assignment_print_master_listing_undelivered获得产品的综合结果，其中dispatch_code_id =“2”和尽数

我的愿望输出将

Product Name Product Count 
    Name 1   2 
    Name 2   3 
    Name 3   7

在此先感谢，希望有人能帮到我..

来源

2015-10-20 Joel Enanod Jr

**这不可能是真的**'选择fsi_courier_assignment_prin t_master_listing.master_listing_id， fsi_master_listing.transmittal_id， fsi_transmittals.product_name fsi_transmittals.transmittal_id'您的选择有4列，您会得到2列结果？ – lad2025

我没有把其他cols –

我认为@ lad2025是建议使用'UNION'而不是'UNION ALL'的东西。但是，你能否更新你的输出来显示列？这是我相信的混乱之源。 –

SELECT product_name, COUNT(*) AS Product_Count 
FROM 
(SELECT 
    fsi_courier_assignment_print_master_listing.master_listing_id, 
    fsi_master_listing.transmittal_id, 
    fsi_transmittals.product_name 
FROM fsi_courier_assignment_print_master_listing 
LEFT JOIN fsi_master_listing ON fsi_courier_assignment_print_master_listing.master_listing_id = fsi_master_listing.master_listing_id 
LEFT JOIN fsi_transmittals ON fsi_master_listing.transmittal_id = fsi_transmittals.transmittal_id 
WHERE dispatch_code_id=2 
UNION ALL 
SELECT 
    fsi_courier_assignment_print_master_listing_undelivered.master_listing_id, 
    fsi_master_listing.transmittal_id, 
    fsi_transmittals.product_name 
FROM fsi_courier_assignment_print_master_listing_undelivered 
LEFT JOIN fsi_master_listing ON fsi_courier_assignment_print_master_listing_undelivered.master_listing_id = fsi_master_listing.master_listing_id 
LEFT JOIN fsi_transmittals ON fsi_master_listing.transmittal_id = fsi_transmittals.transmittal_id 
WHERE dispatch_code_id=2 
) AS sub 
GROUP BY product_name;

LiveDemo

输出：

╔══════════════╦═══════════════╗ 
║ product_name ║ Product_Count ║ 
╠══════════════╬═══════════════╣ 
║ Name 1  ║    2 ║ 
║ Name 2  ║    3 ║ 
║ Name 3  ║    7 ║ 
╚══════════════╩═══════════════╝

来源

2015-10-20 05:37:01 lad2025

@JoelEnanodJr解决了 – lad2025

SELECT 
    fsi_courier_assignment_print_master_listing.master_listing_id, 
    fsi_master_listing.transmittal_id, 
    fsi_transmittals.product_name, 
    fsi_transmittals.transmittal_id 
FROM fsi_courier_assignment_print_master_listing 
LEFT JOIN fsi_master_listing ON fsi_courier_assignment_print_master_listing.master_listing_id = fsi_master_listing.master_listing_id 
LEFT JOIN fsi_transmittals ON fsi_master_listing.transmittal_id = fsi_transmittals.transmittal_id 
WHERE dispatch_code_id=".$this->db->escape($dispatch_code_id)." 
GROUP BY fsi_transmittals.transmittal_id 
UNION ALL 
SELECT 
    fsi_courier_assignment_print_master_listing_undelivered.master_listing_id, 
    fsi_master_listing.transmittal_id, 
    fsi_transmittals.product_name, 
    fsi_transmittals.transmittal_id 
FROM fsi_courier_assignment_print_master_listing_undelivered 
LEFT JOIN fsi_master_listing ON fsi_courier_assignment_print_master_listing_undelivered.master_listing_id = fsi_master_listing.master_listing_id 
LEFT JOIN fsi_transmittals ON fsi_master_listing.transmittal_id = fsi_transmittals.transmittal_id 
WHERE dispatch_code_id=".$this->db->escape($dispatch_code_id)." 
GROUP BY fsi_transmittals.product_name

SELECT fsi_transmittals.product_name, SUM(fsi_transmittals.transmittal_id) AS transmittal_id 
FROM (SELECT 
    fsi_courier_assignment_print_master_listing.master_listing_id, 
    fsi_master_listing.transmittal_id, 
    fsi_transmittals.product_name, 
    fsi_transmittals.transmittal_id 
FROM fsi_courier_assignment_print_master_listing 
LEFT JOIN fsi_master_listing ON fsi_courier_assignment_print_master_listing.master_listing_id = fsi_master_listing.master_listing_id 
LEFT JOIN fsi_transmittals ON fsi_master_listing.transmittal_id = fsi_transmittals.transmittal_id 
WHERE dispatch_code_id=".$this->db->escape($dispatch_code_id)." 
GROUP BY fsi_transmittals.transmittal_id 
UNION ALL 
SELECT 
    fsi_courier_assignment_print_master_listing_undelivered.master_listing_id, 
    fsi_master_listing.transmittal_id, 
    fsi_transmittals.product_name, 
    fsi_transmittals.transmittal_id 
FROM fsi_courier_assignment_print_master_listing_undelivered 
LEFT JOIN fsi_master_listing ON fsi_courier_assignment_print_master_listing_undelivered.master_listing_id = fsi_master_listing.master_listing_id 
LEFT JOIN fsi_transmittals ON fsi_master_listing.transmittal_id = fsi_transmittals.transmittal_id 
WHERE dispatch_code_id=".$this->db->escape($dispatch_code_id).") 
GROUP BY fsi_transmittals.product_name

来源

2015-10-20 05:44:22

我认为它的工作很好。 –

你也介意告诉我们这个查询有什么不同吗？ –

第一个查询不起作用，我仍然得到相同的结果。第二个是错误 –

MySQL的左连接，GROUP BY，计数和UNION ALL

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