10.1.10.1.1. Numeric functions10.1.1.1. CEIL10.1.1.2. ROUND10.1.1.3. TRUNC10.1.1.4. RAND10.1.1.5. SIGN10.1.2. String functions10.1.2.1. CONCAT10.1.2.2. CHARINDEX, INSTR, LOCATE, and POSSTR10.1.2.3. SUBSTR and SUBSTRING10.1.2.4. LENGTH10.1.2.5. LOWER and UPPER10.1.2.6. TO_CHAR, CHAR, and STR10.1.2.7. REPLACE10.1.2.8. REPLICATE and REPEAT10.1.2.9. TRANSLATE10.1.2.10. TRIM, LTRIM, and RTRIM10.1.3. Date and time functions10.1.3.1. GETDATE, SYSDATE, and CURRENT DATE10.1.3.1.1. Time zone functions10.1.3.2. ADD_MONTHS, DATEADD, and date arithmetic10.1.3.3. EXTRACT and DATEPART10.1.3.4. DAYNAME, MONTHNAME, and DATENAME10.1.3.5. MONTHS_BETWEEN and DATEDIFF10.1.4. Aggregate functions10.1.4.1. SUM10.1.4.2. COUNT10.1.4.3. AVG10.1.4.4. MIN and MAX10.1.5. Conversion functions10.1.5.1. Oracle 11 g CONVERT, TRANSLATE...USING, and UNISTR10.1.5.1.1. Data type–specific conversion functions10.1.6. System Functions10.1.7. Miscellaneous functions10.1.7.1. DECODE and CASE10.1.7.2. COALESCE and NULLIF10.1.7.3. NVL, NVL2, and ISNULL10.1.8. User-defined functions10.2. Summary