Problem with an Empty Column

Good Morning list, I am new in the PostgreSQL list, and i have a problem with a query because i have an empty column in
aempty table and i compare this empty column with a column what have values in other table i use an LEFT OUTER JOIN and
workswell, but when i filled the empty table with data and compare again the query give me the same result than if the
tablewas empty, here is the code of my query:<br />SELECT supplierbill_tbl.id<br />FROM supplierbill_tbl <br />LEFT
OUTERJOIN agrouptransacc_tbl<br />ON supplierbill_tbl.id > agrouptransacc_tbl.splbillid<br /><br />--<br />Diego I.
HidalgoD.