sql-server - SQL 查询不返回相关记录处于非事件状态的记录

Question

我有三个帐户 ABC、DEF 和XYZ。ABC 有两个 Inactive Contracts。DEF 没有任何契约(Contract)。XYZ 有两份契约(Contract)(一份有效，一份无效)。

以下查询返回如下输出。

╔════╦══════════════╦══════╗
║name║ accountId    ║Count ║
╠════╬══════════════╬══════╣
║DEF ║ 554-050-4876 ║  0   ║
║XYZ ║ 111-000-4345 ║  1   ║
╚════╩══════════════╩══════╝

但我期待的结果如下:

╔════╦══════════════╦══════╗
║name║ accountId    ║Count ║
╠════╬══════════════╬══════╣
║ABC ║ 244-5677-444 ║  0   ║
║DEF ║ 554-050-4876 ║  0   ║
║XYZ ║ 111-000-4345 ║  1   ║
╚════╩══════════════╩══════╝

意思是，查询应该返回所有Accounts以及活跃Contracts的数量。如果一个帐户不存在契约(Contract)，或者只有不活跃的契约(Contract)是他们的。查询应在 Count 列中返回 0。

SELECT 
    a.name 
    , a.accountid 
    , COUNT(c.contractid) AS  'Count' --Number Active Of Contracts
FROM FilteredAccount AS a
LEFT OUTER JOIN FilteredContract AS c
    ON a.accountid = c.accountid
WHERE a.statecode = 0 -- Active
    AND a.customertypecode = 3 -- Active
    AND a.name IN ('ABC','XYZ')
    AND (c.statecode = 2 or c.statecode is null)
GROUP BY a.name , a.accountid;

提前致谢。

Answer 1

将所有 JOIN 条件移动到 ON 子句中:目前您在 WHERE 中有过滤条件覆盖您的 左外连接。

例如

SELECT 
    a.name 
    , a.accountid 
    , COUNT(c.contractid) AS  'Count' --Number Active Of Contracts
FROM FilteredAccount AS a
LEFT OUTER JOIN FilteredContract AS c
    ON (c.statecode = 2 or c.statecode is null) and a.accountid = c.accountid
WHERE a.statecode = 0 -- Active
    AND a.customertypecode = 3 -- Active
    AND a.name IN ('ABC','XYZ')
GROUP BY a.name , a.accountid;