Mysql

Question

我有这样的陈述：

SELECT
    COUNT(*)AS will
  FROM
    ae_orders o
  LEFT JOIN
    ae_orders_items oi ON oi.order_uid = o.uid
  WHERE
    po_date >= '2016-01-01' AND po_date <= '2016-01-31' AND status_text LIKE '%wil%'

此查询是一个计数(*)，因此结果只有一个字段。但我想一次性执行此查询 6-7 次，仅更改此语句的（如“%will%”）部分，并并排获取每个计数的结果。

想要的结果：

我尝试左连接，像这样的全连接

(
SELECT
  COUNT(*) AS will
FROM
  ae_orders o
LEFT JOIN
  ae_orders_items oi ON oi.order_uid = o.uid
WHERE
  po_date >= '2016-01-01' AND po_date <= '2016-01-31' AND status_text LIKE '%wil%'
) AS will
LEFT JOIN
  (
  SELECT
    COUNT(*) AS will
  FROM
    ae_orders o
  LEFT JOIN
    ae_orders_items oi ON oi.order_uid = o.uid
  WHERE
    po_date >= '2016-01-01' AND po_date <= '2016-01-31' AND status_text LIKE '%phi%'
) AS phil

我不确定这是否可行。如果有人有解决办法。

解决方案

阅读您的一些评论后，我找到了另一种获取和显示数据的方法。

这是得到我的解决方案的语句。

SELECT
  'Will' AS USER,
  COUNT(*) AS TOTAL
FROM
  ae_orders o
LEFT JOIN
  ae_orders_items oi ON oi.order_uid = o.uid
WHERE
  po_date >= '2016-01-01' AND po_date <= '2016-01-31' AND status_text LIKE '%wil%'
UNION
SELECT
  'Phil' AS USER,
  COUNT(*) AS TOTAL
FROM
  ae_orders o
LEFT JOIN
  ae_orders_items oi ON oi.order_uid = o.uid
WHERE
  po_date >= '2016-01-01' AND po_date <= '2016-01-31' AND status_text LIKE '%phi%'
UNION
SELECT
  'Peter' AS USER,
  COUNT(*) AS TOTAL
FROM
  ae_orders o
LEFT JOIN
  ae_orders_items oi ON oi.order_uid = o.uid
WHERE
  po_date >= '2016-01-01' AND po_date <= '2016-01-31' AND status_text LIKE '%Pet%'

我没有并排获得结果，而是一个在另一个之上。

Answer 1

如前所述，您的方案正试图根据条件进行调整。由于所有 3 个查询都是相同的日期范围，只需更改为 SUM( CASE/WHEN )，您将有 1 行包含所有 3 个计数。

SELECT
          SUM( case when status_text LIKE '%wil%' then 1 else 0 end ) as CountWill,
          SUM( case when status_text LIKE '%phi%' then 1 else 0 end ) as CountPhil,
          SUM( case when status_text LIKE '%Pet%' then 1 else 0 end ) as CountPeter
       from
          ae_orders o
             LEFT JOIN ae_orders_items oi 
                ON oi.order_uid = o.uid
       WHERE
              po_date >= '2016-01-01' 
          AND po_date <= '2016-01-31'

Mysql - 连接查询没有公共列

Mysql - Join query no common column

join

left-join

jointable

解决方案