如何根據輸入數據顯示下一個30天的記錄？

Question

從用戶界面， 用戶可以選擇一個日期並點擊提交按鈕，0​​根據輸入字段如何顯示下一個30天的記錄

這是我sqlfiddle http://sqlfiddle.com/#!9/b1f3b/1

目前我如下圖所示

select * from historical_data 
where current_day between '01-OCT-2015' and '07-OCT-2015' 

能否請你讓我知道我怎麼能寫這樣的查詢使用之間？

Answer 1

使用正確的數據類型。使用date等decimal。不是varchar這些。

您的代碼：

create table historical_data 
(
current_day varchar(50) , 
open_value varchar(10) 
); 

INSERT INTO historical_data (current_day,open_value) values ('01-OCT-2015','23.50'); 
INSERT INTO historical_data (current_day,open_value) values ('03-OCT-2015','26.50'); 
INSERT INTO historical_data (current_day,open_value) values ('05-OCT-2015','21.50'); 
INSERT INTO historical_data (current_day,open_value) values ('03-Strawberries','33.44'); 


select * from historical_data 
where current_day between '01-OCT-2015' and '07-OCT-2015' 

亞克西，你有草莓

相反，這樣做：

create table historical_data2 
( id int auto_increment primary key, 
    current_day date not null , 
    open_value decimal(10,2) not null 
); 
truncate table historical_data2; 
INSERT INTO historical_data2 (current_day,open_value) values ('2015-09-01','11.50'); 
INSERT INTO historical_data2 (current_day,open_value) values ('2015-10-01','23.50'); 
INSERT INTO historical_data2 (current_day,open_value) values ('2015-10-03','26.50'); 
INSERT INTO historical_data2 (current_day,open_value) values ('2015-10-04','21.50'); 
INSERT INTO historical_data2 (current_day,open_value) values ('03-Strawberries','33.44'); -- Error 1292: Incorrect date value 
INSERT INTO historical_data2 (current_day,open_value) values ('2015-10-31','22.50'); 
INSERT INTO historical_data2 (current_day,open_value) values ('2015-11-01','33321.50'); 
INSERT INTO historical_data2 (current_day,open_value) values ('2015-11-02','4443321.50'); 
INSERT INTO historical_data2 (current_day,open_value) values ('2015-11-03','55533321.50'); 
INSERT INTO historical_data2 (current_day,open_value) values ('2015-11-04','66633321.50'); 

線束電源的內置MySQL的Date and Time Functions像add_add和interval功能。當您使用適當的數據類型時，這些變得可用。加數學運算正確，並且佔用更少的空間。

select * from historical_data2 
where current_day between '2015-10-02' and DATE_ADD(date('2015-10-02'), INTERVAL 1 MONTH) 
+----+-------------+------------+ 
| id | current_day | open_value | 
+----+-------------+------------+ 
| 3 | 2015-10-03 |  26.50 | 
| 4 | 2015-10-04 |  21.50 | 
| 5 | 2015-10-31 |  22.50 | 
| 6 | 2015-11-01 | 33321.50 | 
| 7 | 2015-11-02 | 4443321.50 | 
+----+-------------+------------+ 

外賣：使用適當的數據類型