SQL QUERY с подзапросом оптимизацией

Question

, как я могу оптимизировать этот запрос,

SELECT 
mp.ProviderName 
,(SELECT count(mc.ClaimSubmissionID) FROM dbo.MST_Claim mc WHERE mc.HeaderID=mpach.HeaderID AND mc.IsActive=1) AS total_claim 
,(SELECT count(mc.ClaimSubmissionID) FROM dbo.MST_Claim mc WHERE mc.HeaderID=mpach.HeaderID AND mc.op=1) AS total_op 
,(SELECT count(mc.ClaimSubmissionID) FROM dbo.MST_Claim mc WHERE mc.HeaderID=mpach.HeaderID AND mc.ip=1) AS total_ip 

FROM dbo.MST_PriorAuthorization_Claim_Header mpach 
INNER JOIN dbo.MS_Provider mp ON mp.Provider_ID = mpach.Provider_ID 

Answer 1

Вы можете изменить свой запрос, используя CASE заявление, как показано ниже

SELECT 
mp.ProviderName 
,sum(case when mc.IsActive=1 then mc.ClaimSubmissionID else 0 end) AS total_claim, 
sum(case when mc.op=1 then mc.ClaimSubmissionID else 0 end) AS total_op 
sum(case when mc.ip=1 then mc.ClaimSubmissionID else 0 end) AS total_ip 

FROM dbo.MST_PriorAuthorization_Claim_Header mpach 
INNER JOIN dbo.MS_Provider mp ON mp.Provider_ID = mpach.Provider_ID 
JOIN dbo.MST_Claim mc ON mc.HeaderID = mpach.HeaderID; 

Answer 2

Использование Суммы CASE Statements избежать всех эти подзапросов.

SELECT 
    mp.ProviderName, 
    SUM(CASE WHEN mc.IsActive=1 THEN 1 ELSE 0 END) AS total_claim, 
    SUM(CASE WHEN mc.op=1 THEN 1 ELSE 0 END) AS total_op, 
    SUM(CASE WHEN mc.ip=1 THEN 1 ELSE 0 END) AS total_ip 
FROM dbo.MST_PriorAuthorization_Claim_Header mpach 
    INNER JOIN dbo.MS_Provider mp ON mp.Provider_ID = mpach.Provider_ID 
    INNER JOIN dbo.MST_Claim mc ON mc.HeaderID=mpach.HeaderID