我要做的是将obj_id
UPDATE obj_object
INNER JOIN obj_extract as address ON (obj_object.id = address.obj_id AND address.category_id = 1)
INNER JOIN obj_extract as city ON (obj_object.id = city.obj_id AND city.category_id = 2)
INNER JOIN obj_extract as country ON (obj_object.id = country.obj_id AND country.category_id = 3)
INNER JOIN obj_extract as phone ON (obj_object.id = phone.obj_id AND phone.category_id = 4)
SET obj_object.address = address.info,
obj_object.city = city.info,
obj_object.country = country.info,
obj_object.phone = phone.info
但是有些obj_extract
行具有相同的category_id
,如果包含相同obj_id
的记录包含多个具有相同category_id
的行,我需要计算,如果是,我需要concat
这些条目并复制到obj_object
表列。表示例:
+----+--------------+---------+---------+
| ID | category_id | info | obj_id |
+----+--------------+---------+---------+
| 1 | 1 | test | 2 |
+----+--------------+---------+---------+
| 2 | 1 | test1 | 2 |
+----+--------------+---------+---------+
| 3 | 2 | test2 | 2 |
+----+--------------+---------+---------+
我需要得到:
obj_object.address = 'test - test1', // // value from address.info
obj_object.city = 'test2', // value from city.info
答案 0 :(得分:1)
您需要考虑使用GROUP_CONCAT
:
UPDATE obj_object o
SET o.address = (SELECT GROUP_CONCAT(info)
FROM obj_extract o2
WHERE o.id = o2.obj_id AND o2.category_id = 1),
o.city = (SELECT GROUP_CONCAT(info)
FROM obj_extract o3
WHERE o.id = o3.obj_id AND o3.category_id = 2),
o.country = (SELECT GROUP_CONCAT(info)
FROM obj_extract o4
WHERE o.id = o4.obj_id AND o4.category_id = 3),
o.phone = (SELECT GROUP_CONCAT(info)
FROM obj_extract o5
WHERE o.id = o5.obj_id AND o5.category_id = 4)
祝你好运。