如何使用组连接在sql中连接三个表

我想连接三个表与组concat.Problem是主表以json格式连接列。如何使用组连接在sql中连接三个表

查询是工作，但一次又一次地重复接合列数据查询 - >

[SELECT tour_package.description AS description, 
     tour_package.NAME AS NAME, 
     GROUP_CONCAT(destination_continent.NAME) AS continent_name, 
     GROUP_CONCAT(travel_style.NAME) AS travel_style_name, 
     tour_package.id AS id, 
     tour_package.img_path_thumb AS img_path_thumb, 
     tour_package.continent_id, 
     tour_package.travel_style_id 
FROM tour_package 
LEFT JOIN destination_continent ON 
     FIND_IN_SET(destination_continent.id, 
      REPLACE(REPLACE(REPLACE(tour_package.continent_id, '\[', '') , '\]', '') , '\"', '')) 
LEFT JOIN travel_style ON 
     FIND_IN_SET(travel_style.id, 
      REPLACE(REPLACE(REPLACE(tour_package.travel_style_id, '\[', '') , '\]', '') , '\"', '')) 
WHERE `tour_package`.`DELETE` = 0 && `destination_continent`.`DELETE` = 0 
LIMIT 0 , 30][1]

表 - >

来源

2016-05-06 Lovepreet Singh Batth

使用在GROUP_CONCAT DISTINCT关键字功能

即：

SELECT tour_package.description AS description, 
     tour_package.NAME AS NAME, 
     GROUP_CONCAT(DISTINCT destination_continent.NAME) AS continent_name, 
     GROUP_CONCAT(DISTINCT travel_style.NAME) AS travel_style_name, 
     tour_package.id AS id, 
     tour_package.img_path_thumb AS img_path_thumb, 
     tour_package.continent_id, 
     tour_package.travel_style_id 
....

来源

2016-05-06 08:37:47

日Thnx，现在我笑我自己，我必须要为内存补品 –

在组串联做Distinct检查

[SELECT tour_package.description AS description, tour_package.NAME AS NAME, GROUP_CONCAT(DISTINCT(destination_continent.NAME)) AS continent_name, GROUP_CONCAT(DISTINCT(travel_style.NAME)) AS travel_style_name, tour_package.id AS id, tour_package.img_path_thumb AS img_path_thumb, tour_package.continent_id, tour_package.travel_style_id FROM tour_package LEFT JOIN destination_continent ON FIND_IN_SET(destination_continent.id, REPLACE(REPLACE(REPLACE(tour_package.continent_id, '\[', '') , '\]', '') , '\"', '')) LEFT JOIN travel_style ON FIND_IN_SET(travel_style.id, REPLACE(REPLACE(REPLACE(tour_package.travel_style_id, '\[', '') , '\]', '') , '\"', '')) WHERE `tour_package`.`DELETE` =0 && `destination_continent`.`DELETE` =0 LIMIT 0 , 30][1]

来源

2016-05-06 08:41:32 Sanjeev

如何使用组连接在sql中连接三个表

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