ASA SQL Reference
SQL Functions
Alphabetical list of functions
Tests if a string argument can be converted to a numeric. If a conversion is possible, the function returns 1; otherwise, 0 is returned. If the argument is null, 0 is returned.
ISNUMERIC ( string )
SQL/92 Vendor extension.
SQL/99 Vendor extension.
Sybase Not supported by Adaptive Server Enterprise.
The following example imports data from an external file, exports rows which contain invalid values, and copies the remaining rows to a permanent table.
create global temporary table MyData( person varchar(100), birth_date varchar(30), height_in_cms varchar(10) ) on commit preserve rows; load table MyData from 'exported.dat'; unload select * from MyData where isdate(birth_date)=0 or isnumeric(height_in_cms)=0 to 'badrows.dat'; insert into PermData select person,birthdate,height_in_cms from MyData where isdate(birth_date)=1 and isnumeric(height_in_cms)=1; commit; drop table MyData;