Teradata Numeric Functions

CASE WHEN UPPER(‘12.77’) = LOWER(‘12.77’) THEN ‘IS_NUMERIC’ ELSE ‘IS_NOT_NUMERIC’ END

Of course, it’s only a workaround that can’t handle all kinds of situations, such as strings consisting only of special characters.

When Teradata 14.00 introduced the TO_NUMBER function, we finally became the possibility to check if  a string is numeric:

CASE WHEN TO_NUMBER(‘12.77’) IS NOT NULL THEN ‘IS_NUMERIC’ ELSE ‘IS_NOT_NUMERIC’ END

You may say, “but there was always a user-defined function IS_NUMERIC available, and you are right. But the problem I often experience at client sites is that execution permissions on these user-defined functions are missing. We don’t have this problem with the built-in functions.

Trunc all decimal places: SELECT TRUNC(12.67) 12.00

Trunc after the first 2 decimal places: SELECT TRUNC(12.1266,2) 12.1200

SELECT CEILING(4.78)
5.00

SELECT FLOOR(4.78)
4.00

SELECT LEAST(12.50, 1.00, 2.88)
1.00

SELECT LEAST(12.50, 1.00, 2.88)
12.50

Round with zero decimal places
SELECT ROUND(12.12)
12.00

Round with three decimal places
SELECT ROUND(12.1266,2)
12.13