Question

here is my query:

select reporttime, datapath, finalconc, instrument from batchinfo 
    join qvalues on batchinfo.rowid=qvalues.rowid where qvalues.rowid 
    in (select rowid from batchinfo where instrument LIKE '%TF1%' and reporttime
    like '10/%/2010%') and compound='ETG' and  name='QC1'

i am running it like this:

    // Create a database connection object using the connection string    
    OleDbConnection myConnection = new OleDbConnection(myConnectionString);

    // Create a database command on the connection using query    
    OleDbCommand myCommand = new OleDbCommand(mySelectQuery, myConnection);

it does not return any results.

when i try this same query in sql server GUI it returns lots of rows

is there a problem specifically with the syntax of the query for c#?

please note that if i simplify the query like select * from table, there is no issue

Answer 1

Are you sure you are connecting to the same database in your code?

On a side note do you need the inner select? Couldn’t you write this query as follows.

  select reporttime,
         datapath,
         finalconc, 
         instrument 
    from batchinfo  
           join qvalues on batchinfo.rowid = qvalues.rowid
   where compound = 'ETG' 
     and name = 'QC1'
     and batchinfo.instrument like '%TF1%'
     and batchinfo.reporttime like '10/%/2010%'