select i.id,c.customer,i.invoice_num from crm_invoice i left join crm_customer c on i.customer_id=c.id? unionall select p.params_name from param_sysparam p left join crm_order o on o.pay_type_id = p.id;報錯select p.params_name from param_sysparam p left join crm_order o on o.pay_type_id = p.id;單獨執行就不應該怎么寫