Executed query with error in subquery? why?

• sunil_ranade

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  April 13, 2004 at 5:12 am

  #82652

  select * from employee where emp_id in (select emp_id from authors)

  run this query in pubs. I

  t will give result of all rows in employee.

  Even though it is not having the field emp_id in authors

  How the mapping is done between these two tables?

  select emp_id from authors

  If u run above query. u will get following error

  Server: Msg 207, Level 16, State 3, Line 1

  Invalid column name 'emp_id'.

  Regards,

  Sunil

   

  
  Software Programmer

• Johan Bijnens

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  April 13, 2004 at 6:41 am

  #502529

  it converts it into a correlated subquery

  problem ? no problem one just has to know and keep it in mind.

  (also take a look at "subquery fundamentals" in BOL )

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• amackay_1

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  April 14, 2004 at 8:23 am

  #502735

  That's interesting.. I didn't realize SQL Server would interpret things that way either..

  If you try:

  select * from employee where emp_id in (select authors.emp_id from authors)

  you get the expected error.. (invalid column id)