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嗨,我有一個前僱員在我們公司做的非常複雜的select語句 它做的是返回申請人申請的所有工作列表。 查詢工作正常,但我只需要獲取唯一的工作應用。我在使用DISTINCT或GROUP BY時遇到問題。 重複的發生是因爲與作業和申請人相關的表格有重複的地方,我無法做任何事情。所以任何人都可以幫我解決這個問題嗎? PS:請不要責怪它的查詢結構不是我的。謝謝!SQL Server GROUPING和DISTINCT
SELECT
J.JobsID,
J.JobsHeader,
I.IndustryName,
J.JobDescription,
J.JobBreif,
J.JobRequirement,
J.JobLocation,
(SELECT CASE WHEN J.HideSalary = 1 THEN 'hidden' ELSE J.Salary END) AS 'Salary',
J.HideSalary,
(SELECT CASE WHEN J.HideCompanyName = 1 THEN 'hidden' ELSE COMP.CompanyName END) AS 'CompanyName',
J.HideCompanyName,
J.CurrentStatus,
J.ExperienceInMonth,
J.ExperienceInYear,
Q.QualificationName,
J.HourID,
J.Age,
J.Gender,
L.CityName,
J.UAENationals,
J.SeniorExecutive,
J.StartDate,
J.EndDate,
S.SpecizationName,
CIRT.SpecizationName AS 'CirtificationName',
J.AvailType,
J.CreatedOn,
J.CreatedBy,
J.ModifiedOn,
J.ModifiedBy,
N.CountryName,
--ETJA.CreatedOn AS 'AppliedOn',
'12/01/2012' AS 'AppliedOn',
ETJA.JobsId AS 'AppliedJobId'
FROM dbo.EmployeeToJobsApplied ETJA
INNER JOIN dbo.Jobs J ON J.JobsID = ETJA.JobsId
INNER JOIN dbo.Employers COMP ON J.CompanyID = COMP.EmployerId
LEFT JOIN dbo.Experience E ON J.ExperienceInYear = E.ExperienceID
LEFT JOIN dbo.Industry I ON J.JobIndustryId = I.IndustryID
LEFT JOIN dbo.Location L ON J.LocationID = L.CityId
LEFT JOIN dbo.Qualification Q ON J.QualificationID = Q.QualificationID
LEFT JOIN dbo.Nation N ON J.CountryID = N.CountryID
LEFT JOIN dbo.Specization S ON J.SpecilizationId = S.SpecizationID
LEFT JOIN dbo.Specization CIRT ON J.CirtificationId = CIRT.SpecizationID
WHERE ETJA.Applied = 1 AND ETJA.EmployeeId=1
那麼你不需要使用GROUPING,因爲你沒有使用任何聚合函數(sum,count等)。因此,如果您包含DISTINCT關鍵字,哪些列會返回不同的值,以致您獲得重複的作業?你真的需要所有這些表和所有這些值返回? – kaj 2012-02-21 09:44:42