如何在sql中为无值获取零

我的问题是

SELECT CASE
WHEN clnt_ntnlty =0 THEN 'Aboriginal'
WHEN clnt_ntnlty =1 THEN 'Torres Strait Islander'
WHEN clnt_ntnlty =2 THEN 'Both Aboring & Torres Strait' 
WHEN clnt_ntnlty =3 THEN 'Neither Aboring OR Torres Strait'
ELSE 'Not Provided' END AS Identy,
ISNULL(COUNT(clnt_ntnlty), 0) AS Counts
FROM dbo.clientInfo
group by clnt_ntnlty

我得到的结果是

---

如果没有值，我希望所有（五行）记录都为零。我尝试过使用group by all，但它不起作用。

您可以创建一个子查询，其中包含四个您想要的值，然后对其执行

左连接

SELECT  a.Identy,
        COALESCE(b.Counts, 0) Counts
FROM    (
            SELECT 'Aboriginal' Identy
            UNION ALL
            SELECT 'Torres Strait Islander' Identy
            UNION ALL
            SELECT 'Both Aboring & Torres Strait' Identy
            UNION ALL 
            SELECT 'Neither Aboring OR Torres Strait' Identy
        ) a LEFT JOIN
        (
            SELECT  CASE
                        WHEN clnt_ntnlty =0 THEN 'Aboriginal'
                        WHEN clnt_ntnlty =1 THEN 'Torres Strait Islander'
                        WHEN clnt_ntnlty =2 THEN 'Both Aboring & Torres Strait' 
                        WHEN clnt_ntnlty =3 THEN 'Neither Aboring OR Torres Strait'
                        ELSE 'Not Provided' END AS Identy,
                        ISNULL(COUNT(clnt_ntnlty), 0) AS Counts
            FROM dbo.clientInfo
            group by clnt_ntnlty
        ) b ON a.Identy = b.Identy

请尝试：

SELECT 
    DISTINCT Identy, 
    COUNT(clnt_ntnlty) OVER (PARTITION BY Identy) Counts
FROM (
        SELECT 0 Val, 'Aboriginal' Identy UNION
        SELECT 1 Val, 'Torres Strait Islander' Identy UNION
        SELECT 2 Val, 'Both Aboring & Torres Strait' Identy UNION
        SELECT 3 Val, 'Neither Aboring OR Torres Strait' Identy 
    ) x left join dbo.clientInfo t on t.clnt_ntnlty=x.Val

如果我正确理解你的问题，你想在哪里数到“零”，那么这是一个简单的答案

更改-
ISNULL（计数（clnt），0）作为计数

到-
COUNT（ISNULL（clnt，0））作为计数

如果这不是您想要的，那么将有一点更详细的描述。
好的，我不为下面的脚本感到自豪，因为它是一个肮脏的解决方案；并集所有可能的值，然后减去一以除去该加法

SELECT CASE
WHEN cte.clnt_ntnlty =0 THEN 'Aboriginal'
WHEN cte.clnt_ntnlty =1 THEN 'Torres Strait Islander'
WHEN cte.clnt_ntnlty =2 THEN 'Both Aboring & Torres Strait' 
WHEN cte.clnt_ntnlty =3 THEN 'Neither Aboring OR Torres Strait'
ELSE 'Not Provided' END AS Identy,
ISNULL(COUNT(cte.clnt_ntnlty) - 1, 0) AS Counts
FROM (select ID,clnt_ntnlty from dbo.clientInfo
union select 0,'0' as clnt_ntnlty
union select 1, '1' as clnt_ntnlty
union select 2, '2' as clnt_ntnlty
union select 3, '3' as clnt_ntnlty) as cte
group by clnt_ntnlty

更改union select以匹配您的模式
您是否有一个表，其中有一个FK用于国籍？Msg 156，15级，状态1，第21行关键字“VALUES”附近的语法不正确。很抱歉。。ur查询Msg 1087，级别15，状态2，第33行的错误必须声明表变量“@”。错误：Msg 207，级别16，状态1，第44行的列名“ID”无效。Msg 8155，级别16，状态2，第44行“cte”的第1列未指定任何列。已尝试。。但结果是一样的
SELECT CASE
WHEN cte.clnt_ntnlty =0 THEN 'Aboriginal'
WHEN cte.clnt_ntnlty =1 THEN 'Torres Strait Islander'
WHEN cte.clnt_ntnlty =2 THEN 'Both Aboring & Torres Strait' 
WHEN cte.clnt_ntnlty =3 THEN 'Neither Aboring OR Torres Strait'
ELSE 'Not Provided' END AS Identy,
ISNULL(COUNT(cte.clnt_ntnlty) - 1, 0) AS Counts
FROM (select ID,clnt_ntnlty from dbo.clientInfo
union select 0,'0' as clnt_ntnlty
union select 1, '1' as clnt_ntnlty
union select 2, '2' as clnt_ntnlty
union select 3, '3' as clnt_ntnlty) as cte
group by clnt_ntnlty