1、在原有的時間欄位上做加減
（1）減幾天date_sub
update bg_outpatient_test set test_time=date_sub(test_time,interval 30 day) where test_time>sysdate();
（2）加幾天adddate
update bg_outpatient_test set test_time=adddate(test_time,interval 30 day) where test_time>sysdate();
2、按日、周、月統計
select
date_format(create_time,
'%y%u'
) weeks,
count
(caseid)
count
from
tc_case
group
byweeks;
select
date_format(create_time,
'%y%m%d'
) days,
count
(caseid)
count
from
tc_case
group
bydays;
select
date_format(create_time,
'%y%m'
) months,
count
(caseid)
count
from
tc_case
group
bymonths;
3、設定乙個時間段的隨機時間戳
set date= concat(floor(2016 + (rand() * 1)),'-',lpad(floor(1 + (rand() * 11)),2,0),'-',lpad(floor(3 + (rand() * 8)),2,0))
set time= concat(lpad(floor(0 + (rand() * 23)),2,0),':',lpad(floor(0 + (rand() * 59)),2,0),':',lpad(floor(0 + (rand() * 59))
update bg_outpatient_test set test_time= concat(@dates,' ',@time);
4、儲存過程和游標
drop procedure if exists out_patient_test;
create procedure out_patient_test()
begin
declare num int default 0;
declare ids int default 1001;
declare sn varchar(20);
declare done int ;
declare c_device_relation cursor for select device_sn from patient_device_relation;
/* 異常處理 */
declare continue handler for sqlstate '02000' set done=1;
truncate table bg_outpatient_test;
while num<280 do
open c_device_relation;
set done=0;
while done<>1 do
fetch c_device_relation into sn;
/*rand()取是是乙個0和1之間的隨機小數，floor(x)返回不大於x的最大整數，floor（1.8）等於1*/
/*floor(2016 + (rand() * 1)取2023年，floor是取整函式*/
/*lpad(floor(8 + (rand() * 3)),2,0)取9-11月之間的月份，並且lpad在月份之間填充0，如果大於兩位，則不填充。如9月份則是09,10月是10*/
/*lpad(floor(1+(rand() * 30)),2,0)取1-30號*/
set @dates= concat(floor(2016 + (rand() * 1)),'-',lpad(floor(9 + (rand() * 3)),2,0),'-',lpad(floor(1+(rand() * 30)),2,0));
set @time= concat(lpad(floor(0 + (rand() * 23)),2,0),':',lpad(floor(0 + (rand() * 59)),2,0),':',lpad(floor(0 + (rand() * 59)),2,0));
insert into bg_outpatient_test (id, test_time, code, devicesn, reservedcode, usercode, result, foodstatus, create_time, is_repeat, time_id, time_name, normal_result, normal)
values (ids, concat(@dates,' ',@time), ids, sn, '01', null, '11.41', '2', concat(@dates,' ',@time), '1', 10037, '早餐後', '1', '0');
set ids=ids+1;
end while;
set num=num+1;
close c_device_relation;
end while;
end
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