从mysql查询中提取特定日期

问题描述：

I have to columns in my table (check_in and checkout). Both of them has this format dd-mm-yyyy. I want to check if there is any date available between my two paramaters(inputs).

I tried like this:

select * from rezervare where date(check_out) > date('my_checkout_input')

but this works only in a few cases. If i have a reservation between 12-03-2015 - 15-03-2015 and another reservation between 17-03-2015 and 20-03-2015. It will not take the date between 16-03-2015 as a free date. Can you give me some ideas ?

我必须在我的表中使用列（check_in和checkout）。他们都有这种格式dd-mm-yyyy code>。我想检查两个参数（输入）之间是否有可用的日期。 p>

我试过这样： p>


  select * from rezervare where date（check_out）＆gt;  date（'my_checkout_input'）
  code>  pre> 
 
 但这只适用于少数情况。 如果我在 12-03-2015  -  2015年3月15日 strong>之间进行预订，并在 17-03-2015和2015-03-03之间预订 strong>。 它不会将 16-03-2015  strong>之间的日期作为免费日期。 你能给我一些想法吗？   p> 
  div>

答

create table rezervare (
    id int auto_increment,
    check_in varchar(10),
    checkout varchar(10),
    primary key (id)
);
insert into rezervare values
    (null, '12-03-2015', '12-03-2015'),
    (null, '13-03-2015', '13-03-2015'),
    (null, '14-03-2015', '14-03-2015'),
    (null, '15-03-2015', '15-03-2015'),
    (null, '16-03-2015', '16-03-2015'),
    (null, '17-03-2015', '17-03-2015'),
    (null, '19-03-2015', '19-03-2015'),
    (null, '20-03-2015', '20-03-2015')
;

select * from rezervare;
+----+------------+------------+
| id | check_in   | checkout   |
+----+------------+------------+
|  1 | 12-03-2015 | 12-03-2015 |
|  2 | 13-03-2015 | 13-03-2015 |
|  3 | 14-03-2015 | 14-03-2015 |
|  4 | 15-03-2015 | 15-03-2015 |
|  5 | 16-03-2015 | 16-03-2015 |
|  6 | 17-03-2015 | 17-03-2015 |
|  7 | 19-03-2015 | 19-03-2015 |
|  8 | 20-03-2015 | 20-03-2015 |
+----+------------+------------+

If your schema same as this, you can't use date function, because:

select id, date(check_in), date(checkout) from rezervare ;
+----+----------------+----------------+
| id | date(check_in) | date(checkout) |
+----+----------------+----------------+
|  1 | NULL           | NULL           |
|  2 | NULL           | NULL           |
|  3 | NULL           | NULL           |
|  4 | NULL           | NULL           |
|  5 | NULL           | NULL           |
|  6 | NULL           | NULL           |
|  7 | NULL           | NULL           |
|  8 | NULL           | NULL           |
+----+----------------+----------------+

But you can use between, in my example it works fine:

select * from rezervare where checkout between '12-03-2015' and '15-03-2015';
+----+------------+------------+
| id | check_in   | checkout   |
+----+------------+------------+
|  1 | 12-03-2015 | 12-03-2015 |
|  2 | 13-03-2015 | 13-03-2015 |
|  3 | 14-03-2015 | 14-03-2015 |
|  4 | 15-03-2015 | 15-03-2015 |
+----+------------+------------+

select * from rezervare where checkout > '14-03-2015';
+----+------------+------------+
| id | check_in   | checkout   |
+----+------------+------------+
|  4 | 15-03-2015 | 15-03-2015 |
|  5 | 16-03-2015 | 16-03-2015 |
|  6 | 17-03-2015 | 17-03-2015 |
|  7 | 19-03-2015 | 19-03-2015 |
|  8 | 20-03-2015 | 20-03-2015 |
+----+------------+------------+

But true way - alter table and use correct date type.

答

In this case, you should use int to store the date as a timestamp. The PHP function date() could transform timestamp to date in the format you choose.

答

Use the BETWEEN function:

SELECT *
    FROM rezervare
    WHERE (date BETWEEN '2010-03-12' AND '2010-03-15')

从mysql查询中提取特定日期

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