Mysql 从两个表中创建一个表，其中数据位于一个表中的行中

我有两个由用户ID链接的表。我想从这两个表中创建一个新表，从每个表中提取几个字段。在一个表中，每个用户ID只有一行，在另一个表中，每个用户有几行数据

第一个表格很简单-所有数据都在一行中。
但是，在第二个表中，数据是按行排列的，其中每个用户ID有几行。我只想为每个用户ID找到其中的四行，然后将它们插入到表中的一列中。这是下面的代码，但它不起作用。我可以像这样嵌套子查询吗

INSERT INTO new_table
select table1.ID, table1.user_email, table1.display_name, table2.meta-value (where table2.meta_key = ‘pet’), table2.meta-value (where table2.meta_key = ‘color'), table2.meta-value (where table2.meta_key = ‘location), table2.meta-value (where table2.meta_key = ‘house'),
from table_1, table2

试试这个：

INSERT INTO new_table
(SELECT 
    t1.ID, 
    t1.user_email, 
    t1.display_name, 
    (SELECT meta-value FROM table2 AS t2 WHERE t2.meta_key = 'pet' AND t2.user_id = t1.user_id), 
    (SELECT meta-value FROM table2 AS t2 WHERE t2.meta_key = 'color' AND t2.user_id = t1.user_id), 
    (SELECT meta-value FROM table2 AS t2 WHERE t2.meta_key = 'location' AND t2.user_id = t1.user_id), 
    (SELECT meta-value FROM table2 AS t2 WHERE t2.meta_key = 'house' AND t2.user_id = t1.user_id),
    FROM table_1 AS t1
)

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但是，它没有经过测试，因为我没有找到关于表模式/数据的更多详细信息。希望这有帮助。

您可以使用查询加入：

INSERT INTO new_table
select table1.ID, table1.user_email, table1.display_name, table3.meta-value, table4.meta-value, table5.meta-value, table6.meta-value
from table_1 inner join
(select ID, meta_value from table2 where meta_key='pet') as table3 inner join
(select ID, meta_value from table2 where meta_key='color') as table4 inner join
(select ID, meta_value from table2 where meta_key='location') as table5 inner join
(select ID, meta_value from table2 where meta_key='house') as table6;

---

我让它工作了。我不知道这比其他建议好还是坏

 INSERT INTO new_table
 SELECT t1.ID,  t1.user_email,  t1.display_name, 
        GROUP_CONCAT(IF(m.meta_key = 'pet_field', m.meta_value, NULL)) AS pet,
        GROUP_CONCAT(IF(m.meta_key = 'color_field', m.meta_value, NULL)) AS color,
        GROUP_CONCAT(IF(m.meta_key = 'location_field', m.meta_value, NULL)) AS location,
        GROUP_CONCAT(IF(m.meta_key = 'house_field', m.meta_value, NULL)) AS house
 FROM wp_users t1,
      wp_usermeta m
 WHERE u.ID = m.user_id
 GROUP BY u.ID;

 INSERT INTO new_table
 SELECT t1.ID,  t1.user_email,  t1.display_name, 
        GROUP_CONCAT(IF(m.meta_key = 'pet_field', m.meta_value, NULL)) AS pet,
        GROUP_CONCAT(IF(m.meta_key = 'color_field', m.meta_value, NULL)) AS color,
        GROUP_CONCAT(IF(m.meta_key = 'location_field', m.meta_value, NULL)) AS location,
        GROUP_CONCAT(IF(m.meta_key = 'house_field', m.meta_value, NULL)) AS house
 FROM wp_users t1,
      wp_usermeta m
 WHERE u.ID = m.user_id
 GROUP BY u.ID;