选择基于状态

Question

我有用于计算组件此SQL查询：

SELECT COUNT(CS.COMPONENTTYPEID) AS CNT 
FROM COMPONENTTYPE CT LEFT 
OUTER JOIN COMPONENTSTATS CS ON CS.COMPONENTTYPEID = CT.COMPONENTTYPEID 
WHERE CT.COMPONENTTYPEID IN (?, ?) 
GROUP BY CT.NAME, 
     CT.COMPONENTTYPEID 
ORDER BY CT.COMPONENTTYPEID 

我要选择具有status = 'Active'所有组件。我需要插入的正确位置在哪里？也许这：

SELECT COUNT(CS.COMPONENTTYPEID) AS CNT 
FROM COMPONENTTYPE CT LEFT 
OUTER JOIN COMPONENTSTATS CS ON CS.COMPONENTTYPEID = CT.COMPONENTTYPEID 
WHERE CT.COMPONENTTYPEID IN (?, ?) WHERE STATUS = 'Active' 
GROUP BY CT.NAME, 
     CT.COMPONENTTYPEID 
ORDER BY CT.COMPONENTTYPEID 

Answer 1

SELECT COUNT(CS.COMPONENTTYPEID) AS CNT 
FROM COMPONENTTYPE CT 
    LEFT OUTER JOIN COMPONENTSTATS CS ON CS.COMPONENTTYPEID = CT.COMPONENTTYPEID AND CS.STATUS = 'Active' 
WHERE CT.COMPONENTTYPEID IN (?, ?) 
GROUP BY CT.NAME, CT.COMPONENTTYPEID 
ORDER BY CT.COMPONENTTYPEID 

过滤器应在加入条款，因为它是用于创建连接表的结果集。

Answer 2

你要么需要有一种化合物whereclause，否则你invalide你离开加盟..

SELECT COUNT(CS.COMPONENTTYPEID) AS CNT 
FROM COMPONENTTYPE CT 
LEFT OUTER JOIN COMPONENTSTATS CS 
    ON CS.COMPONENTTYPEID = CT.COMPONENTTYPEID 
WHERE CT.COMPONENTTYPEID IN (?, ?) and (STATUS = 'Active' or Status is null) 
GROUP BY CT.NAME, 
     CT.COMPONENTTYPEID 
ORDER BY CT.COMPONENTTYPEID 

，或者你有把限制条件的加入本身。

SELECT COUNT(CS.COMPONENTTYPEID) AS CNT 
FROM COMPONENTTYPE CT 
LEFT OUTER JOIN COMPONENTSTATS CS 
    ON CS.COMPONENTTYPEID = CT.COMPONENTTYPEID 
    AND (STATUS = 'Active') 
WHERE CT.COMPONENTTYPEID IN (?, ?) 
GROUP BY CT.NAME, 
     CT.COMPONENTTYPEID 
ORDER BY CT.COMPONENTTYPEID 

Answer 3

由于STATUS Coloumn是COMPONENTSTATS表，查询应该是

SELECT COUNT(CS.COMPONENTTYPEID) AS CNT 
FROM COMPONENTTYPE CT LEFT 
OUTER JOIN COMPONENTSTATS CS ON CS.COMPONENTTYPEID = CT.COMPONENTTYPEID 
WHERE CT.COMPONENTTYPEID IN (?, ?) AND CS.STATUS = 'Active' 
GROUP BY CT.NAME, 
     CT.COMPONENTTYPEID 
ORDER BY CT.COMPONENTTYPEID