limit in sql oracle code example

Example 1: oracle limit rows

SELECT * 
FROM   sometable
ORDER BY name
OFFSET 20 ROWS FETCH NEXT 10 ROWS ONLY;

Example 2: SQL SELECT TOP Equivalent in oracal

syntax -> SELECT column_name(s)
FROM table_name
WHERE ROWNUM <= number 
////example///
SELECT *
FROM Persons
WHERE ROWNUM <=5

Example 3: rownum in sql

SELECT ROWNUM, a.*
FROM (SELECT customers.*
      FROM customers
      WHERE customer_id > 4500
      ORDER BY last_name) a;

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