(select a.log_id,create_date,content,creator,belong_to_user,a.customer_code,follow_up_way from gs_log a left join gs_customer b on a.customer_code=b.customer_code where b.customer_id='35926') union (select a.log_id,create_date,content,creator,belong_to_user,('') as customer_code,follow_up_way from gs_log a left join gs_r_customer_log b on a.log_id=b.log_id where b.customer_id='35926') limit 5,5

我写的：

 $log_join = "left join __CUSTOMER__ b  on a.customer_code = b.customer_code";
            $log_data = M('log')->alias('a')->where("b.customer_code != '' AND b.customer_id = $customer_id")->join
                ($log_join)->field("a.log_id,create_date,content,creator,belong_to_user,a.customer_code,follow_up_way")
                ->union("SELECT a.log_id,create_date,content,creator,belong_to_user,a.customer_code,follow_up_way FROM gs_log a left join gs_customer b on a.customer_code = b.customer_code WHERE ( b.customer_code != '' AND b.customer_id = $customer_id )")
                ->select();

没有串联起来