The LENGTH() function
Informix®
Informix provides the LENGTH()
function to count the number of bytes of a character string expression:
SELECT LENGTH("aaa"), LENGTH(col1) FROM table Informix LENGTH() does not count the
trailing blanks for CHAR or VARCHAR expressions, while Oracle
counts the trailing blanks.
Informix LENGTH() returns 0 when the
given string is empty. That means, LENGTH('')=0.
Dameng®
Dameng supports the LENGTH() function,
but there are some differences with Informix
LENGTH().
The Dameng LENGTH() function counts
trailing blanks. When using a CHAR column, values are blank padded, and the function
returns the size of the CHAR column. When using a VARCHAR column,
trailing blanks are significant, and the function returns the number of characters, including
trailing blanks.
Solution
Check if the trailing blanks are significant when using the LENGTH() SQL function
in your application.
RTRIM() function:SELECT LENGTH(RTRIM(col1)) FROM tableLENGTH() expressions can be controlled with the following FGLPROFILE
entry:dbi.database.dsname.ifxemul.length = { true | false }