In SQL, ROWNUM and ROWID are both used to identify a specific row in a table, but they have different meanings and usage.

ROWNUM is a pseudocolumn used in Oracle databases, which assigns a unique row number to each row in the result set of a query. The row number starts at 1 for the first row, and increments by 1 for each subsequent row. ROWNUM is assigned to the result set after all other operations in the query, including sorting and filtering, have been performed.

ROWID is a physical address of a row in an Oracle table. It uniquely identifies a specific row in the table, and it is guaranteed to remain the same even if the row is updated. ROWID is useful when you need to refer to a specific row in a table without using a primary key or unique constraint.

Hence, ROWNUM is a pseudocolumn that assigns a unique row number to each row in a result set, while ROWID is a physical address that identifies a specific row in a table.

Hello everyone -
ROWID is representative of the allocation of physical memory. ROWNUM is representative of the sequence allocated to any data retrieval bunch. ROWID is the permanent identity or address of a row. ROWNUM is a temporarily assigned sequence to a row.