sql server - Why is this SQL Query causing an "Ambiguous column name" error? -


i have sql query fails execute:

select p.personid, createddate, * dbo.person p  join dbo.potentiallyfraudulentpeople pfp on p.personid= pfp.personid  order createddate

the person table has pk of personid (int). potentiallyfraudulentpeople view query of person table joined other tables decide if trust person or not. potentiallyfraudulentpeople view has 1 column: personid.

when try execute query, error:

msg 209, level 16, state 1, line 3
ambiguous column name 'createddate'.

i understand error telling me createddate column name ambiguous , need preface table's alias, 'p'.

this query works:

select p.personid, createddate, * dbo.person p  join dbo.potentiallyfraudulentpeople pfp on p.personid= pfp.personid  order p.createddate

what don't understand why need use 'p' alias in order by statement , not in select column list. also, don't understand why need use table alias @ since potentiallyfraudulentpeople view doesn't have createddate column.

can explain odd behavior?

i using sql server 2008 , ssms execute query.

update
also, tried removing createddate column select column list , query no longer requires 'p' alias in order by. query works well:

select p.personid, * dbo.person p  join dbo.potentiallyfraudulentpeople pfp on p.personid= pfp.personid  order createddate

you selecting createddate column twice.

  1. explicitly via createddate.
  2. implicitly via *.

it doesn't know occurence want sort on - , doesn't realize both occurences refer same column.


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