What is Max Rowid in Oracle

What is rowID & rowNum (ROWID vs ROWNUM) - sql, oracle10g, rownum, rowid

I would like to know the difference between and

And as you can see both in our table.

when i run this:

It returns a query, but when I do the same for rowid it says

Inconsistent data types: The expected ROWID has NUMBER

And even in some tables, rownum returns null. Why so

Please clarify: rowid vs rownum? (Demo request)

Many Thanks

EDIT: Must use an alias to display and like (since they are a pseudocolumn):

Reply:

12 for the answer № 1

Both Rownum and Rowed are pseudo-columns.

Rowid

For each row in the database, the ROWID pseudocolumn returns the row address.

An example query would be:

More information about Rowid here: https://docs.oracle.com/cd/B19306_01/server.102/b14200/pseudocolumns008.htm

Rownum

For each ROWNUMPseudocolumn row returned by a query, a returns number indicating the order in which Oracle selects the row from a table or set of joined rows. The first row selected has a ROWNUM of 1, the second has 2, and so on.

You can limit the number of results with Rownum as follows:

More information about Rownum here: https://docs.oracle.com/cd/B19306_01/server.102/b14200/pseudocolumns009.htm

difference

The actual difference between and This line ID is a permanent unique identifier for that line. The rownum is temporary, however. If you change your query, the rownum number refers to a different line, the rowid will not appear.

The ROWNUM is therefore a sequential number that only applies to a specific SQL statement. In contrast, the ROWID is a unique ID for a row.


1 for the answer № 2

Rownum (numeric) = Generated sequence number of your output.
Rowid (hexadecimal) = Is generated automatically when the line is inserted.


-1 for the answer № 3

Line ID shows the unique for the series shows the standard unique series of numbers.