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See http://publib.boulder.ibm.com/infocenter/rbdhelp/v8r0m0/index.jsp "You can specify a STRING with a specific number of characters, in which case it is a limited-length string, or you can declare a variable-length string by omitting the length specification, as in the following examples: myLimitedString STRING(25); myVarString STRING; In the above example, myLimitedString is different from a CHAR(25) variable because STRINGs contain Unicode data while CHARs contain data in the native character set. Limited-length strings are most commonly used to map to the SQL VARCHAR type."
The codes have been checked in bug 376525. Thanks.