Collection the data metrics where there are unique keys

results = sql.rows("select spid, time_blocked, blocked from master..sysprocesses WHERE db_name(dbid)=${dbname}") }. our instance here is spid , can  i change to spid   ie.. as mentioned below

results = sql.rows("select spid, time_blocked, blocked from master..sysprocesses WHERE spid =${wildvalue}")

do i need to create datasource for CMD & TIME_bloked? if what are the properties for them