mysql week()函数返回的实际周数少了一个

Question

我使用mysql的week()函数来确定从日期开始的周数.问题是我面临的是它总是从实际周数返回少一个数字.假设今天是2013-05-15,因为它是今年的第20周,但结果却是19.以下是我正在使用的查询.

 SELECT *,WEEK(date_visit) AS week_no FROM property_view_details;

Answer 1

直接来自文档:

mysql> SELECT WEEK('2008-02-20',1);
    -> 8

你可以改变的行为,WEEK由第二个参数设置为两种0或10索引或分别为1索引的结果.

Answer 2

将第二个week参数设置为正确的值.

引用文档:https: //dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html#function_week

M   F.day   Range   Week 1 is the first week …
0   Sunday  0-53    with a Sunday in this year
1   Monday  0-53    with more than 3 days this year
2   Sunday  1-53    with a Sunday in this year
3   Monday  1-53    with more than 3 days this year
4   Sunday  0-53    with more than 3 days this year
5   Monday  0-53    with a Monday in this year
6   Sunday  1-53    with more than 3 days this year
7   Monday  1-53    with a Monday in this year

M = Mode
F.day = First day of week

样品:

mysql> SELECT WEEK('2008-02-20',0);
        -> 7
mysql> SELECT WEEK('2008-02-20',1);
        -> 8