sql server - I am learning SQL and work for a school system -

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my quest 1 line per employmentassignment row if staff member has multiple rows in employment table. (include fields existing staffmember view come person, identity, employmentassignment, school , department. include new field alias "districtstart" reporting person's earliest employment.startdate.) question exam , can not figure out how make pull 1 assignment. have , says correct but... pulling more 1 assignment. keep me banging head against wall anymore.

select      p.personid,      p.stateid,      p.staffnumber,      p.staffstateid,      i.identityid,      i.effectivedate,      i.lastname,      i.firstname,      i.middlename,      i.suffix,      i.alias,      i.gender,      i.birthdate,      i.ssn,      i.raceethnicity,      ea.assignmentid,      ea.startdate,      min(e.startdate) districtstart,      ea.enddate,      ea.title,      ea.type,      ea.teache,      ea.specialed,      ea.behavior,      ea.health,      ea.advisor,      ea.supervisor,      ea.foodservice,      ea.departmentid,      s.schoolid,      s.name   schoolname,      s.number schoolnumber,      d.name   departmentname,      ea.excludereferral,      ea.counselor     dbo.person p (nolock)      inner join dbo.[identity] (nolock)      on       p.currentidentityid = i.identityid      inner join dbo.employment e      on       e.personid = p.personid      inner join dbo.employmentassignment ea (nolock)      on       p.personid = ea.personid      inner join dbo.school s (nolock)      on       s.schoolid = ea.schoolid      left outer join dbo.department d (nolock)      on       d.departmentid = ea.departmentid group e.startdate,      p.personid,      p.stateid,      p.staffnumber,      p.staffstateid,      i.identityid,      i.effectivedate,      i.lastname,      i.firstname,      i.middlename,      i.suffix,      i.alias,      i.gender,      i.birthdate,      i.ssn,      i.raceethnicity,      ea.assignmentid,      ea.startdate,      ea.enddate,      ea.title,      ea.type,      ea.teacher,      ea.specialed,      ea.behavior,      ea.health,      ea.advisor,      ea.supervisor,      ea.foodservice,      ea.departmentid,      s.schoolid,      s.name,      s.number,      d.name,      ea.excludereferral,      ea.counselor

you need take out e.startdate group statement. in query taking min(e.startdate), won't if grouping it. here trivial example show mean:

select '20110101' startdate #datesexample union select '20110102' startdate union select '20110103' startdate  select min(startdate) #datesexample group startdate  select min(startdate) #datesexample

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