MySql 查询 - 多个 SELECT 语句

Question

我正在创建这个 MYSQL 查询：

SELECT
      GROUP_CONCAT(if(field_number = '2', value, NULL)) AS 'Field1',
      GROUP_CONCAT(if(field_number = '3', value, NULL)) AS 'Field2',
      GROUP_CONCAT(if(field_number = '4', value, NULL)) AS 'Field3',
      GROUP_CONCAT(if(field_number = '5', value, NULL)) AS 'Field4',
      GROUP_CONCAT(if(field_number = '6', value, NULL)) AS 'Field5',
      GROUP_CONCAT(if(field_number = '7', value, NULL)) AS 'Field6',
      GROUP_CONCAT(if(field_number = '8', value, NULL)) AS 'Field7',
      GROUP_CONCAT(if(field_number = '9', value, NULL)) AS 'Field8'
from wp_rg_lead_detail WHERE form_id = "3"
GROUP BY lead_id;

上面的查询我得到了很好的结果。我有另一个 table 存储每个条目的日期，并且可以通过 form_id.

进行交叉检查

我用来获取日期的查询如下：

SELECT date_created FROM wp_rg_lead WHERE form_id="3";

我需要加入两个查询，以便将所有结果集中在一起。

Answer 1

由于您没有提供表格结构，我的猜测是：

SELECT
      wp2.date_created,
      GROUP_CONCAT(if(field_number = '2', value, NULL)) AS 'Field1',
      GROUP_CONCAT(if(field_number = '3', value, NULL)) AS 'Field2',
      GROUP_CONCAT(if(field_number = '4', value, NULL)) AS 'Field3',
      GROUP_CONCAT(if(field_number = '5', value, NULL)) AS 'Field4',
      GROUP_CONCAT(if(field_number = '6', value, NULL)) AS 'Field5',
      GROUP_CONCAT(if(field_number = '7', value, NULL)) AS 'Field6',
      GROUP_CONCAT(if(field_number = '8', value, NULL)) AS 'Field7',
      GROUP_CONCAT(if(field_number = '9', value, NULL)) AS 'Field8'
FROM wp_rg_lead_detail wp1
LEFT JOIN wp_rg_lead wp2
ON wp1.lead_id = wp2.id
WHERE wp1.form_id = "3"
GROUP BY wp1.lead_id;

MySql 查询 - 多个 SELECT 语句

MySql Query - Multiple SELECT statements

mysql

select

join

group-concat

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