| re: Support for ROWNUM and ROWID
Postgresql does not have an equivalent of Oracle's ROWNUM.
In many cases you can achieve the same result by using LIMIT and OFFSET in your query.
Same with ROWID; it does not exist in Postgresql, but you can use CTID as a reference to a row. CTID is a system column containing the file block number and position in the block for the row.
Sometimes people use OID, but in the latest releases this system column is optional, and it is not created unless you explicitly request it in your "CREATE TABLE" statement.
| 
