Teradata IsNumeric

Posted on 2006-11-13
Last Modified: 2012-06-21
Does anyone know a way to filter out non-numeric characters in a char field?

I am looking for something like the following that works with Teradata:
Select * from table where IsNumeric(field1) = 1

I have a problem converting a string to an integer on a field that "should" contain all numbers, but it doesn't. Or if there's any way to not get a blasted "Bad Character in format or data" error whenever I try to convert the field to an integer.
Question by:JeepGeekin
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LVL 65

Accepted Solution

rockiroads earned 500 total points
Comment Utility
Have u considered creating a UDF and using that?
here is a premade one - look for is_integer.txt (2nd last post on page)

the code for this (in C) is

-- Function is_integer
--Call exampel: Select:select mydatabase.is_integer('123A4677')
--Result  : 1 when Integer
--          0 when not Integer
--SQL-registration in Teradata:

 SPECIFIC is_integer_v
 EXTERNAL NAME 'SS!is_integer_v!/home/mydatabase/udf/is_integer_v.c'

--Compilation in Unix: cc -c is_integer_v.c -o is_integer_v.o


#define SQL_TEXT Latin_Text
#include "sqltypes_td.h"
#include <string.h>
#include <stdlib.h>
#define IsNull -1
#define IsNotNull 0

void is_integer_v( VARCHAR_LATIN *inputString,
                   int *result,
                   int *inputStringIsNull,
                   int *ResultIsNull,
                   char sqlstate[6],
                   SQL_TEXT extname[129],
                   SQL_TEXT specific_name[129],
                   SQL_TEXT error_message[257] )
    char *ch;

    *error_message = '\0';
    *ResultIsNull = 0;

    /* make false result the default */
    *result = 0;

    /* Return Null value on Null Input */
    if ((*inputStringIsNull) == IsNull)

/* what is an Integer

         [+|-] xxxx

    ch = (char *)inputString;

    /* Skip leading spaces */
    /*   remove this while line to disallow Leading whitespace */
    while ( isspace(*ch))   ch ++;

    if ( (*ch == '-') || (*ch == '+' ))
        ch ++;

        /* is the first character at least a digit? */
    if ( !isdigit(*ch) ) return ;

    /* skip over all the digits */
    /* already validated first digit above */
    while (isdigit(*ch)) ;

    /* skip over the trailing white space */
    /* Remove this while line out   to disallow Trailing whitespace */
    while ( isspace(*ch))   ch ++;

    /* we should be at the end of the string.
       if not it is not an integer
    *result = ( *ch == '\0' );


the other method described is to use UPPER

Select * from table where field1 <> upper(field1)


Author Comment

Comment Utility
Thanks! I don't have the ability to add UDFs to this system, but the Upper approach worked for all characters but the "~", "`", "@","#","$", ...
Then I just filter thi smuch smaler list out. Also, I had to add a lower statement & a casespecific statement:

select * from Upper(field) <> Lower(Field) (CASESPECIFIC)

Thanks again!

LVL 65

Expert Comment

Comment Utility
Cool and thanks for posting your solution, be very useful for others in the same predicament


Best of luck with the rest of your project

Author Comment

Comment Utility
OK. I feel stupid, so I'll post this as well. The Between statement can still recognize numeriic ranges when dealing with characters. This is probably the best way to handle this:

Select * from table where trim(field) BETWEEN '0' AND '99999'

(use as many 9's as you need)


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