Oracle Built-in Functions Guide

There are many built-in functions available in Oracle database, including but not limited to:

1. String functions such as CONCAT, SUBSTR, UPPER, LOWER, INSTR, etc.
2. Mathematical functions, such as ROUND, TRUNC, CEIL, FLOOR, POWER, and others.
3. Date functions such as SYSDATE, TO_DATE, EXTRACT, and MONTHS_BETWEEN.
4. Conversion functions such as TO_CHAR, TO_NUMBER, TO_DATE, etc.
5. Conditional functions such as CASE and DECODE.
6. Aggregate functions such as SUM, AVG, COUNT, MIN, MAX, etc.
7. Analyze functions such as RANK, DENSE_RANK, ROW_NUMBER, LEAD, and LAG.

These built-in functions can help users handle and analyze data more conveniently.