IS NULL, NULLIF, COALESCE, 작동하지 않습니다.

Question

결과가 Null 인 경우 "0"을 반환하려고하는 SQL 쿼리가 있습니다.

는 지금까지 내가 시도 :

SELECT  NULLIF (Amountt, '0') AS count 
FROM   1Table 
WHERE  (Operations_Day BETWEEN @startdate AND @enddate) AND (location = @Storenumber) AND (Hour = '18') 

SELECT  ISNULL(Amountt, 0) AS count 
FROM   1Table 
WHERE  (Operations_Day BETWEEN @startdate AND @enddate) AND (location = @Storenumber) AND (Hour = '18') 

SELECT CASE WHEN (Amountt IS NULL) THEN 0 ELSE Amountt END AS count 
FROM   1Table 
WHERE  (Operations_Day BETWEEN @startdate AND @enddate) AND (location = @Storenumber) AND (Hour = '18') 

모든 결과는 VB.net에서 잘 처리되지 않은 빈 문자열을 반환 어떻게 반환 할 수 있습니다 "0"

Answer 1

Amountt가 아닌 것을 의미 NULL. case 대신 사용해보십시오 : 상황이 코드를 더 행을 반환하지 않습니다이다

select (case when Amountt is null or Amountt = 'NULL' or Amountt = '' then 0 else Amountt end) 

경우에, 당신은 집계를 사용할 수 있습니다

SELECT COALESCE(SUM(Amountt), '0') AS count 
FROM 1Table 
WHERE (Operations_Day BETWEEN @startdate AND @enddate) AND 
    (location = @Storenumber) AND (Hour = '18');