Grafana draws the trend chart

Example data ：

use test_bi;
CREATE TABLE `orderpaytable` (
  `time1` varchar(20) DEFAULT NULL,
  `time2` varchar(20) DEFAULT NULL,
  `orderpay` int(10) DEFAULT NULL,
  `month_rate` decimal(10,2) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;

#  insert data 
INSERT INTO test_bi.orderpaytable (time1,time2,orderpay,month_rate) VALUES
	 ('2016-01','2016-01-01',1407993,NULL),
	 ('2016-02','2016-02-01',684899,-0.51),
	 ('2016-03','2016-03-01',1297697,0.89),
	 ('2016-04','2016-04-01',1183767,-0.09),
	 ('2016-05','2016-05-01',1691896,0.43),
	 ('2016-06','2016-06-01',1450639,-0.14),
	 ('2016-07','2016-07-01',1152697,-0.21),
	 ('2016-08','2016-08-01',1318004,0.14),
	 ('2016-09','2016-09-01',1289457,-0.02),
	 ('2016-10','2016-10-01',1134492,-0.12),
	 ('2016-11','2016-11-01',1243779,0.10),
	 ('2016-12','2016-12-01',1270597,0.02),
	 ('2017-01','2017-01-01',1305803,0.03),
	 ('2017-02','2017-02-01',786593,-0.40),
	 ('2017-03','2017-03-01',987215,0.26),
	 ('2017-04','2017-04-01',883131,-0.11),
	 ('2017-05','2017-05-01',1125141,0.27),
	 ('2017-06','2017-06-01',1036588,-0.08),
	 ('2017-07','2017-07-01',946463,-0.09),
	 ('2017-08','2017-08-01',1282120,0.35),
	 ('2017-09','2017-09-01',1139918,-0.11),
	 ('2017-10','2017-10-01',1136302,0.00),
	 ('2017-11','2017-11-01',1179867,0.04),
	 ('2017-12','2017-12-01',1208147,0.02);

Visual display ：

select   STR_TO_DATE( time2 ,'%Y-%m-%d') as time 
        ,orderpay as  This month, 
from test_bi.orderpaytable

select   STR_TO_DATE( time2 ,'%Y-%m-%d') as time 
        ,lag(orderpay,1)over() as  Last month, 
from test_bi.orderpaytable

Time series:

select   STR_TO_DATE( time2 ,'%Y-%m-%d') as time 
        ,orderpay as  This month, 
from test_bi.orderpaytable;

select   STR_TO_DATE( time2 ,'%Y-%m-%d') as time 
        ,month_rate as  Link ratio 
from test_bi.orderpaytable