It is a simple SQL Query interface function
obm_sql_query(sqlcmd, username = "", password = "", paranoid = T, port = 5432, database = "gisdata")
username most probably automatically set by create_pg_user module password most probably automatically set by create_pg_user module paranoid password promt type postgres server port, default is 5432 database remote database, default is gisdata
obm_sql_query("SELECT DATE_PART('day', enddate::timestamp - startdate::timestamp) AS days FROM nestboxes WHERE enddate IS NOT NULL AND startdate IS NOT NULL ORDER BY days")
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