寻找一些建议来完成针对 3 个不同表的自定义 mysql 查询

Question

我想创建一个查询，通过查询包含条目相关信息的 3 个数据库来动态填充 table。

wp_gf_entry、wp_gf_entry_meta，以及（理想情况下）与 wp_posts

查询正在使用 wp_gf_entry 和 wp_gf_entry_meta tables。

SELECT DISTINCT 
  t2.id, 

  MAX(CASE WHEN t1.`meta_key` = '1.3' THEN t1.meta_value END) firstname,
  MAX(CASE WHEN t1.`meta_key` = '1.6' THEN t1.meta_value END) lastname,
  MAX(CASE WHEN t1.`meta_key` = '5.4' THEN t1.meta_value END) state,
  MAX(CASE WHEN t1.`meta_key` LIKE '%45.%' THEN t1.meta_value END) division

FROM
  `wp_gf_entry_meta` t1 
  LEFT JOIN `wp_gf_entry` t2
    ON (
      t1.`entry_id` = t2.`id` 
    )
WHERE (
    t2.`form_id` = 71
    AND t2.`is_read` = 1 AND t2.`status` = 'active' 
        AND t1.`meta_key` IN ('1.3', '1.6', '5.4', '45.1', '45.2', '45.3', '45.4', '45.5', '45.6')
  )
  GROUP BY t2.`id`
ORDER BY 
    t1.`id` ASC,
    t1.`entry_id` ASC

这很有效，如果条目是 'read' 而条目不是 'trashed'。

+-----+-----------+----------+-------+------------------------------+
| id  | firstname | lastname | state |           division           |
+-----+-----------+----------+-------+------------------------------+
| 166 | Steve     | Jobs     | QLD   | (null)                       |
| 253 | Bill      | Clinton  | NSW   | (null)                       |
| 427 | Maria     | McOldguy | VIC   | Grand Master's (65 and over) |
| 447 | Some      | Bloke    | NSW   | Master's (60-64)             |
+-----+-----------+----------+-------+------------------------------+

但此查询仍然需要人工每天多次与网站交互以处理条目（将其标记为已读）——因为无论条目是否已成功支付，条目仍会写入数据库.

这是我想查询 wp_posts table 的地方，使用每个条目的 wp_gf_entry_meta 行中存储的 woocommerce_order_number 键和值对。

因此将查询修改为将 woocommerce_order_number 拉入数组，我认为可以查询的内容：

SELECT DISTINCT 
  t2.id, 

  MAX(CASE WHEN t1.`meta_key` = 'woocommerce_order_number' THEN t1.meta_value END) wcID,
  MAX(CASE WHEN t1.`meta_key` = '1.3' THEN t1.meta_value END) firstname,
  MAX(CASE WHEN t1.`meta_key` = '1.6' THEN t1.meta_value END) lastname,
  MAX(CASE WHEN t1.`meta_key` = '5.4' THEN t1.meta_value END) state,
  MAX(CASE WHEN t1.`meta_key` LIKE '%45.%' THEN t1.meta_value END) division

FROM
  `wp_gf_entry_meta` t1 
  LEFT JOIN `wp_gf_entry` t2
    ON (
      t1.`entry_id` = t2.`id` 
    )
WHERE (
t2.`form_id` = 71
    AND t2.`is_read` = 1 AND t2.`status` = 'active'
        AND t1.`meta_key` IN ('1.3', '1.6', '5.4', '45.1', '45.2', '45.3', '45.4', '45.5', '45.6', 'woocommerce_order_number')

  )
  GROUP BY t2.`id`
ORDER BY 
    t1.`id` ASC,
    t1.`entry_id` ASC

上面的查询给了我一个包含 woocommerce 订单的列：

+-----+------+-----------+----------+-------+------------------------------+
| id  | wcID | firstname | lastname | state |           division           |
+-----+------+-----------+----------+-------+------------------------------+
| 166 |    1 | Steve     | Jobs     | QLD   | (null)                       |
| 253 |    2 | Bill      | Clinton  | NSW   | (null)                       |
| 427 |    3 | Maria     | McOldguy | VIC   | Grand Master's (65 and over) |
| 447 |    4 | Some      | Bloke    | NSW   | Master's (60-64)             |
+-----+------+-----------+----------+-------+------------------------------+

但是，我想通过在 WHERE 语句中添加以下内容来消除人为因素

AND t1.`meta_value` IN (SELECT t3.ID FROM wp_posts t3 WHERE t3.ID = 'wcID' AND t3.`post_status` IN ('wc-processing', 'wc-completed', 'wc-free-of-charge') AND t3.`post_type` = 'shop_order' )

导致此错误消息 "Warning: #1292 Truncated incorrect DOUBLE value: 'wcID'"。

而且我不太确定如何巧妙地处理这个最终的 AND 语句。

SQL Fiddle location

有没有办法使用 woocommerce_order_number 别名 wcID 查询 wp_posts table 和 ID 列？

Answer 1

Akina 在这里回答了这个问题Database Administrators

下面是最终的工作 sql 查询：

SELECT 
  t2.id, 
  MAX(CASE WHEN t1.`meta_key` = '1.3' THEN t1.meta_value END) firstname,
  MAX(CASE WHEN t1.`meta_key` = '1.6' THEN t1.meta_value END) lastname,
  MAX(CASE WHEN t1.`meta_key` = '5.4' THEN t1.meta_value END) state,
  MAX(CASE WHEN t1.`meta_key` LIKE '%45.%' THEN t1.meta_value END) division
FROM  wp_gf_entry_meta t1 
LEFT JOIN wp_gf_entry t2 
    ON t1.entry_id = t2.id
LEFT JOIN ( SELECT t3.ID 
            FROM wp_posts t3 
            WHERE t3.`post_status` IN ('wc-processing', 'wc-completed', 'wc-free-of-charge') 
              AND t3.`post_type` = 'shop_order' ) t4 
    ON t1.`meta_key` = 'woocommerce_order_number' AND t1.meta_value = t4.ID
WHERE t2.`form_id` = 71
  AND t2.`status` = 'active'
  AND t1.`meta_key` IN ('1.3', '1.6', '5.4', '45.1', '45.2', '45.3', '45.4', '45.5', '45.6', 'woocommerce_order_number')
GROUP BY t2.id

寻找一些建议来完成针对 3 个不同表的自定义 mysql 查询

Looking for some advice to complete custom mysql query against 3 different tables

mysql

wordpress

woocommerce

gravity-forms-plugin