Question

我希望在页面顶部显示关键项目的总数和列表下方。这是我的查询

SELECT  vs.vessel_name, vs.CallSign ,COUNT(IF(m.AvailableQuant <= m.MinQuant,1, NULL)) AS 'Critical'                
FROM tbl_vesselmaster vs
INNER JOIN comp_login cl ON vs.co_id = cl.id
INNER JOIN m_shipinv m ON vs.id = m.ShipId
WHERE vs.co_id=123
GROUP BY vs.id, vs.vessel_name ;

这是输出

vessel_name  CallSign  Critical_Items  
-----------  --------  ----------------
Sima Sadaf   (NULL)                   4
sdare        3q1                      1

我想在页面顶部显示关键项目的总数，即5个项目是至关重要的我怎么得到这笔钱？

Answer 1

以下查询将返回关键项目的总和：

SELECT  SUM(IF(m.AvailableQuant <= m.MinQuant,1, 0)) as total FROM tbl_vesselmaster vs
    INNER JOIN comp_login cl ON vs.co_id = cl.id
    INNER JOIN m_shipinv m ON vs.id = m.ShipId
    WHERE vs.co_id=123;

Answer 2

SELECT  COUNT(IF(m.AvailableQuant <= m.MinQuant,1, NULL)) AS 'Critical'                
FROM tbl_vesselmaster vs
INNER JOIN comp_login cl ON vs.co_id = cl.id
INNER JOIN m_shipinv m ON vs.id = m.ShipId
WHERE vs.co_id=123

应该为您提供所有关键项目

Answer 3

我希望您只想在现有查询中获得总数。

select sum(Critical) as Total from(
SELECT  vs.vessel_name, vs.CallSign ,COUNT(IF(m.AvailableQuant <= m.MinQuant,1, NULL)) AS Critical                
FROM tbl_vesselmaster vs
INNER JOIN comp_login cl ON vs.co_id = cl.id
INNER JOIN m_shipinv m ON vs.id = m.ShipId
WHERE vs.co_id=123
GROUP BY vs.id, vs.vessel_name )alias;

Answer 4

你尝试过这样的事吗？

select sum(d.Critical) from (SELECT  vs.vessel_name, vs.CallSign ,COUNT(IF(m.AvailableQuant <= m.MinQuant,1, NULL)) AS 'Critical'                
FROM tbl_vesselmaster vs
INNER JOIN comp_login cl ON vs.co_id = cl.id
INNER JOIN m_shipinv m ON vs.id = m.ShipId
WHERE vs.co_id=123
GROUP BY vs.id, vs.vessel_name )d

Answer 5

使用WITH ROLLUP可以获得额外的总计。然后确保先获取此值，并为呼号显示null：

SELECT 
  vessel_name, 
  case when vessel_name is not null then CallSign end as CallSign, 
  Critical
FROM
(
  SELECT
    vs.vessel_name, 
    vs.CallSign,
    SUM(m.AvailableQuant <= m.MinQuant) AS Critical
  FROM tbl_vesselmaster vs
  INNER JOIN comp_login cl ON vs.co_id = cl.id
  INNER JOIN m_shipinv m ON vs.id = m.ShipId
  WHERE vs.co_id=123
  GROUP BY vs.id WITH ROLLUP
) AS vessels
ORDER BY (vessel_name IS NOT NULL), vessel_name;

获取计数列的总和

5 个答案: