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Sql 不同值的count（）_Sql_Count_Group By_Duplicates - Fatal编程技术网
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Sql 不同值的count（）

sql

Sql 不同值的count（）,sql,count,group-by,duplicates,Sql,Count,Group By,Duplicates,以下面的例子为例 CREATE TABLE #repeated ( iValue int NOT NULL) INSERT INTO #repeated VALUES(1),(1),(2),(3),(4),(5),(5),(5),(6),(7) SELECT * FROM #repeated SELECT count(*) as countAsterisco ,count(iValue) as countValue FROM #repeated 两个计数均考虑重复值，结果

以下面的例子为例

CREATE TABLE #repeated ( iValue int NOT NULL)

INSERT INTO #repeated
VALUES(1),(1),(2),(3),(4),(5),(5),(5),(6),(7)

SELECT * FROM #repeated

SELECT
    count(*) as countAsterisco
    ,count(iValue) as countValue
FROM #repeated

两个计数均考虑重复值，结果为10。我只需要计算不同的值，所以结果必须是7

有这样的功能吗？我想，
count（iValue）
就可以了

select count(distinct iValue) from #repeated