Using distinct keyword with union

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I am getting Duplicate rows in my query, despite using UNION and DISTINCT keywords.

Here is my query:

SQL

(SELECT DISTINCT A.AppointmentId,
                 u.Firstname,
                 u.Gender,
                 u.UserEmail,
                 u.PhoneNo,
                 a.PatientFirstName,
                 a.PatientLastName,
                 a.PatientGender,
                 a.Date,
                 a.TimeStart,
                 a.CompanyId,
                 C.CompanyName,
                 a.ProviderId,
                 a.TimeEnd,
                 a.Reason,
                 Ad.Line1,
                 Ad.Line2,
                 Ad.City,
                 Ad.State,
                 Ad.Zip
 FROM   Users u,
        Appointment a,
        Company C,
        Address Ad
 WHERE  u.UserId = a.UserId
        AND A.CompanyId = C.Id
        AND C.AddressId = Ad.Id
        AND A.ProviderId = '2EA0430F-3775-4623-92B1-5045CF836C11')
UNION
(SELECT DISTINCT A.AppointmentId,
                 E.Name AS FirstName,
                 E.Gender,
                 E.Email AS UserEmail,
                 E.PhoneNumber AS PhoneNo,
                 a.PatientFirstName,
                 a.PatientLastName,
                 a.PatientGender,
                 A.Date,
                 A.TimeStart,
                 A.CompanyId,
                 C.CompanyName,
                 A.ProviderId,
                 A.TimeEnd,
                 A.Reason,
                 Ad.Line1,
                 Ad.Line2,
                 Ad.City,
                 Ad.State,
                 Ad.Zip
 FROM   Appointment A,
        Employee E,
        Company C,
        Address Ad
 WHERE  A.ProviderId = '2EA0430F-3775-4623-92B1-5045CF836C11'
        AND C.AddressId = Ad.Id
        AND A.UserId = E.EmployeeId
        AND A.CompanyId = C.Id)
ORDER  BY A.Date DESC

Can anybody tell me why this is happening, and help me fix it?

Posted 31-Oct-12 23:24pm

.net333

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Comments

Abhinav S 1-Nov-12 5:41am

UNION removes distinct rows by default.
Are you sure your data has duplicate rows?

1 solution

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Abhinav S · Answer 1 · 2012-10-31T23:39:00

Solution 1

UNION removes distinct rows by default.
Check your joins to ensure no duplicates are being returned.

Posted 31-Oct-12 23:39pm

Abhinav S

Comments

.net333 1-Nov-12 6:16am

here Admin data is in two tables

1) Users 2) Employees Tables

first query is for fetching the UsersAppointments

second Query is for fetching the Employees Appointments..So here Same Data is Repeating for Admins