What is difference between ROW_NUMBER and Rowid?

What is difference between Rowid and Rownum and ROW_NUMBER?

ROWID gives the address of rows or records. ROW_NUMBER gives the rank of records. ROWID is automatically generated unique id at the time of insertion of row in the table. ROWNUM is retrieved along with the select statement.

What is a Rowid?

A row ID is a value that uniquely identifies a row in a table. A column or a host variable can have a row ID data type. A ROWID column enables queries to be written that navigate directly to a row in the table because the column implicitly contains the location of the row. Each value in a ROWID column must be unique.

What is the use of Rowid and Rownum in Oracle?

ROWID & ROWNUM are pseudocolumns which are not actual columns in the table but behave like actual columns. You can select the values from pseudocolumns like ROWID & ROWNUM. ROWID & ROWNUM are very important pseudocolumns in oracle which is used in data retrieval.

Why Rownum is used?

You can use ROWNUM to limit the number of rows returned by a query, as in this example: SELECT * FROM employees WHERE ROWNUM < 10; If an ORDER BY clause follows ROWNUM in the same query, then the rows will be reordered by the ORDER BY clause. The results can vary depending on the way the rows are accessed.