update and select count from common table. The table Common does not contain the field XXX.

How can I select count from Common table and also update it using update_recordset? 

(common table sounds weird, How to frame it in a better technical way?)

Was trying something like below, but it doesn't works:

SysDictTable dt = SysDictTable::newName('Table1');

Common common = dt.makeRecord();



select count(Column1) from common;



update_recordset common

setting column1=0;

Thanks!