按重复项和行计数过滤mysql查询

Question

任务是获取有两个以上不同特殊代码的订单代码列表， 现在我已经有了这个查询

SELECT
    o.id        AS iOrderId,
    o.code          AS sOrderCode,
    oa.pnr          AS sSpecialCode
FROM
    order_air AS oa
JOIN
    orders AS o ON 1
        AND oa.order_id = o.id
WHERE 1 
    AND o.status = 11
    AND oa.issued = 1
    AND oa.change_status != 0
    AND oa.issued_date BETWEEN NOW() - INTERVAL 12 MONTH AND NOW()
GROUP BY o.id
HAVING COUNT(*) >= 2
LIMIT 20

它会让我回头

一切都很好，但是这个查询不检查不同的特殊代码，只返回所有超过2个特殊代码的订单代码。 我已经尝试过调查IF以保存以前的orderid，然后通过它进行检查，但我没有意识到如何将以前的id存储到类似@prev的内容中，所以这对我没有帮助，任何想法如何过滤这个队列吧？

Answer 1

我认为这就是你要做的事。

SELECT
    o.id        AS iOrderId,
    o.code      AS sOrderCode
FROM
    orders AS o
JOIN
    (SELECT order_id, COUNT(DISTINCT pnr) AS cnt
     FROM order_air
     WHERE issued = 1
       AND change_status != 0
       AND issued_date BETWEEN NOW() - INTERVAL 12 MONTH AND NOW()
     GROUP BY order_id) oa_count
ON o.id = oa_count.order_id

WHERE oa_count.cnt >= 2 
  AND o.status = 11

LIMIT 20

Answer 2

JOIN
orders AS o ON 1
    AND oa.order_id = o.id
    AND something < something else