How to use concat() method in wql?

I am develop wmi application to get windows logs by using WQL query. How to use CONCAT() method in that query.

Input WQL Query :

wmic -U XXX%XXX //XXX "Select CONCAT(Category, '|DHCP') from Win32_NTLogEvent where TimeWritten > '06/04/2014 13:59:00' and Logfile = 'Security'"

Output :

[wmi/wmic.c:212:main()] ERROR: Retrieve result data.
NTSTATUS: NT code 0x80041017 - NT code 0x80041017

Without using CONCAT() method, it will work perfectly. if any other way to get value using CONCAT() method in WQL.

Notes: When i using CONCAT() method in different scenario, it is not working. it will throw error code.

Please Help me Guys.

Thanks in Advance.

The is not CONCAT function in WQL, the WQL is just a a small subset of the SQL standard and doesn't include such function.