what is the rowid and rownum in SQL | Lotus it hub Pune | Interview Preparation on SQL | Interview

what is rowid and rownum in sql
SQL ROWID and ROWNUM: Explained
In SQL, particularly in Oracle databases, ROWID and ROWNUM are pseudocolumns that provide ways to reference and manage individual rows within a table or a query result set.
ROWID
Physical Address: ROWID represents the physical address of a row on disk. It's a unique identifier for a row's storage location within a table, according to oracle-base.com.
Permanence: ROWID values are relatively permanent for the life of a row, but they can change if the row is moved (e.g., during table rebuilds or reorganization operations).
Fastest Access: Using ROWID provides the fastest way to access a single row, even faster than using a primary key.
Not Recommended for Long-Term Use: Because ROWID can change, it's not recommended to store ROWID values in tables as foreign keys or for long-term row identification.
Applications: ROWID is useful within a single transaction, especially for operations that involve retrieving a row and then updating or deleting it, according to Stack Overflow. It's also used internally by Oracle for features like the SELECT ... FOR UPDATE statement.
ROWNUM
Sequential Number: ROWNUM assigns a sequential number to each row returned by a query, starting from 1.
Temporary Assignment: ROWNUM values are assigned after the WHERE clause is processed but before sorting or aggregation occurs, and they are not stored permanently with the row itself.
Depends on Order of Retrieval: The value of ROWNUM for a given row depends on the order in which Oracle retrieves the rows.
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