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  • SQL 获取 weekday
    千次阅读
    2018-07-18 11:08:38

    1、利用DATEPART函数可以获取 weekday

    select DATEPART(WEEKDAY,getdate())

    可以参考:SQL Server DATEPART() 函数

    2、@@datefirst

    可以从先这个查询中获取 @@datefirst 的信息,例如简体中文为7,表示将星期日作为每周开始的第一天;

    SELECT * FROM master.dbo.syslanguages

    可以通过 set datefist 1 ,将星期一作为每周开始的第一天,例如:

    declare @intdatefirst int
    
    select @intdatefirst = @@DATEFIRST
    
    if @intdatefirst <> 1
    	set datefirst 1
    select DATEPART(w,getdate()) AS [Weekday]
    
    set datefirst @intdatefirst

     

     

    更多相关内容
  • MySQL WEEKDAY()用法及代码示例

    千次阅读 2021-03-16 17:14:06
    MySQL中的WEEKDAY()函数...用法:WEEKDAY(date)参数:此方法接受上面提到的和下面描述的一个参数:date:我们要从中提取工作日值的日期或日期时间。返回值:它返回给定日期的工作日值。示例1:在2020/9/27使用WEEKDAY(...

    MySQL中的WEEKDAY()函数用于查找给定日期的工作日值。如果日期为NULL,则WEEKDAY()函数将返回NULL。否则,它将返回日期的索引,即星期一为0,星期二为1,星期日为6。

    用法:

    WEEKDAY(date)

    参数:此方法接受上面提到的和下面描述的一个参数:

    date:我们要从中提取工作日值的日期或日期时间。

    返回值:它返回给定日期的工作日值。

    示例1:在2020/9/27使用WEEKDAY()功能查找当前日期的星期几。

    SELECT WEEKDAY(NOW()) AS WeekDay;

    输出:

    mysql> SELECT WEEKDAY(NOW()) AS WeekDay;

    +---------+

    | WeekDay |

    +---------+

    | 6 |

    +---------+

    因此,当WEEKDAY函数返回6时,当前日期为“星期日”。

    示例2:使用WEEKDAY()函数从给定的日期时间中查找工作日值。

    SELECT WEEKDAY ('2017-08-22 08:09:22') AS WeekDay_Value ;

    输出:

    +---------------+

    | WeekDay_Value |

    +---------------+

    | 1 |

    +---------------+

    因此,在此示例中,日期为“星期二”。

    示例3:当日期为NULL时,使用WEEKDAY()函数从给定的日期时间中查找星期几的值。

    SELECT WEEKDAY (NULL) AS WeekDay_Value ;

    输出:

    +---------------+

    | WeekDay_Value |

    +---------------+

    | NULL |

    +---------------+

    示例4:在此示例中,我们将查找每个工作日售出的产品数量。为了演示创建一个名为的表。

    产品:

    CREATE TABLE Product(

    Product_id INT AUTO_INCREMENT,

    Product_name VARCHAR(100) NOT NULL,

    Buying_price DECIMAL(13, 2) NOT NULL,

    Selling_price DECIMAL(13, 2) NOT NULL,

    Selling_Date Date NOT NULL,

    PRIMARY KEY(Product_id)

    );

    现在将一些数据插入到Product表中:

    INSERT INTO

    Product(Product_name, Buying_price, Selling_price, Selling_Date)

    VALUES

    ('Audi Q8', 10000000.00, 15000000.00, '2020-08-26' ),

    ('Volvo XC40', 2000000.00, 3000000.00, '2020-08-27' ),

    ('Audi A6', 4000000.00, 5000000.00, '2020-08-28' ),

    ('BMW X5', 5000500.00, 7006500.00, '2020-09-01' ),

    ('Jaguar XF', 5000000, 7507000.00, '2020-09-04' ),

    ('Mercedes-Benz C-Class', 4000000.00, 6000000.00, '2020-09-05' ),

    ('Jaguar F-PACE', 5000000.00, 7000000.00, '2020-09-08' ),

    ('Volvo S90', 4500000.00, 6000000.00, '2020-09-11' ),

    ('BMW X4', 4000000.00, 6200000.00, '2020-09-12' ),

    ('Porsche Macan', 6500000.00, 8000000.00, '2020-09-16' ) ;

    因此,产品表为:

    mysql> Select * from Product;

    +------------+-----------------------+--------------+---------------+--------------+

    | Product_id | Product_name | Buying_price | Selling_price | Selling_Date |

    +------------+-----------------------+--------------+---------------+--------------+

    | 1 | Audi Q8 | 10000000.00 | 15000000.00 | 2020-08-26 |

    | 2 | Volvo XC40 | 2000000.00 | 3000000.00 | 2020-08-27 |

    | 3 | Audi A6 | 4000000.00 | 5000000.00 | 2020-08-28 |

    | 4 | BMW X5 | 5000500.00 | 7006500.00 | 2020-09-01 |

    | 5 | Jaguar XF | 5000000.00 | 7507000.00 | 2020-09-04 |

    | 6 | Mercedes-Benz C-Class | 4000000.00 | 6000000.00 | 2020-09-05 |

    | 7 | Jaguar F-PACE | 5000000.00 | 7000000.00 | 2020-09-08 |

    | 8 | Volvo S90 | 4500000.00 | 6000000.00 | 2020-09-11 |

    | 9 | BMW X4 | 4000000.00 | 6200000.00 | 2020-09-12 |

    | 10 | Porsche Macan | 6500000.00 | 8000000.00 | 2020-09-16 |

    +------------+-----------------------+--------------+---------------+--------------+

    现在,我们将查找每个工作日售出的产品数量。

    SELECT

    WEEKDAY (Selling_Date) WeekDay,

    COUNT(Product_id) Product_Sold

    FROM

    Product

    GROUP BY WEEKDAY(Selling_Date)

    ORDER BY WEEKDAY(Selling_Date);

    输出:

    +---------+--------------+

    | WeekDay | Product_Sold |

    +---------+--------------+

    | 1 | 2 |

    | 2 | 2 |

    | 3 | 1 |

    | 4 | 3 |

    | 5 | 2 |

    +---------+--------------+

    展开全文
  • Python calendar.weekday()方法 (Python calendar.weekday() Method) weekday() method is an inbuilt method of the calendar module in Python. It works on simple text calendars and returns what is the day ...

    Python calendar.weekday()方法 (Python calendar.weekday() Method)

    weekday() method is an inbuilt method of the calendar module in Python. It works on simple text calendars and returns what is the day of the week for the given year, month and day mentioned in the function argument. Here Monday denotes 0 and incrementing the following days by one for the year(1970–…), month (1–12), day (1–31).

    weekday()方法是Python中日历模块的内置方法。 它适用于简单的文本日历,并返回函数参数中给定的年,月和日的星期几。 在这里,星期一表示0,然后将年(1970–…),月(1–12),天(1–31)的第二天增加1。

    Module:

    模块:

        import calendar
    
    

    Syntax:

    句法:

        weekday(year, month, day)
    
    

    Parameter(s):

    参数:

    • year: It is a required parameter, which represents the year value of the calendar

      year :这是必填参数,代表日历的年份

    • month: It is a required parameter, which represents the month value of the calendar

      month :这是必填参数,代表日历的月份值

    • day: It is a required parameter, which represents the day of the month.

      day :这是必填参数,代表月份中的一天。

    Return value:

    返回值:

    The return type of this method is <class 'int'>, it returns a number which is the day on this given year, month and day. Monday is 0 and Sunday is 6.

    此方法的返回类型为<class'int'> ,它返回一个数字,该数字是该给定的年,月和日的日期。 星期一是0,星期日是6。

    Example:

    例:

    # Python program to illustrate the 
    # use of weekday() method
      
    # importing calendar module 
    import calendar 
    
    year = 2020
    month = 2
    day = 20
    x = calendar.weekday(year, month, day)
    print("Weekday number for the given date:", x)
    print()
    
    # We can also make a list of days and 
    # print the day name accordingly
    wday = ['Monday', "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"]
    year = 1996
    month = 10
    day = 27
    x = calendar.weekday(year, month, day)
    print("Weekday number:", x)
    print("Weekday name:", wday[x])
    
    

    Output

    输出量

    Weekday number for the given date: 3
    
    Weekday number: 6
    Weekday name: Sunday
    
    

    Note: The date in the function argument should be valid, otherwise it will raise a ValueError.

    注意:函数参数中的日期应有效,否则将引发ValueError

    For example, if you print 31 September 2019, this will be wrong as September has only 30 days.

    例如,如果您打印2019年9月31日 ,这将是错误的,因为9月只有30天。

    Example:

    例:

    # Python program to illustrate the 
    # use of weekday() method
      
    # importing calendar module 
    import calendar 
    
    year = 2019
    month = 2
    day = 29
    
    x = calendar.weekday(year, month, day)
    
    print("Weekday number for the given date:", x)
    
    print()
    
    

    Output

    输出量

    Traceback (most recent call last):
      File "main.py", line 11, in <module>
        x = calendar.weekday(year, month, day)
      File "/usr/lib/python3.8/calendar.py", line 117, in w
    eekday
        return datetime.date(year, month, day).weekday()
    ValueError: day is out of range for month
    
    
    

    翻译自: https://www.includehelp.com/python/calendar-weekday-method-with-example.aspx

    展开全文
  • 参考链接: Python中的日历函数 2(monthrange(),prcal(),weekday()…)Python calendar.weekday()方法 (Python calendar.weekday() Method)weekday() method is an inbuilt method of the calendar module in ...

    参考链接: Python中的日历函数 2(monthrange(),prcal(),weekday()…)

    Python calendar.weekday()方法 (Python calendar.weekday() Method)

    weekday() method is an inbuilt method of the calendar module in Python. It works on simple text calendars and returns what is the day of the week for the given year, month and day mentioned in the function argument. Here Monday denotes 0 and incrementing the following days by one for the year(1970–…), month (1–12), day (1–31).

    weekday()方法是Python中日历模块的内置方法。 它适用于简单的文本日历,并返回函数参数中给定的年,月和日的星期几。 在这里,星期一表示0,然后将年(1970–…),月(1–12),天(1–31)的第二天增加1。

    Module:

    模块:

    import calendar

    Syntax:

    句法:

    weekday(year, month, day)

    Parameter(s):

    参数:

    year: It is a required parameter, which represents the year value of the calendar year :这是必填参数,代表日历的年份 month: It is a required parameter, which represents the month value of the calendar  month :这是必填参数,代表日历的月份值 day: It is a required parameter, which represents the day of the month. day :这是必填参数,代表月份中的一天。

    Return value:

    返回值:

    The return type of this method is , it returns a number which is the day on this given year, month and day. Monday is 0 and Sunday is 6.

    此方法的返回类型为,它返回一个数字,该数字是该给定的年,月和日的日期。 星期一是0,星期日是6。

    Example:

    例:

    # Python program to illustrate the

    # use of weekday() method

    # importing calendar module

    import calendar

    year = 2020

    month = 2

    day = 20

    x = calendar.weekday(year, month, day)

    print("Weekday number for the given date:", x)

    print()

    # We can also make a list of days and

    # print the day name accordingly

    wday = ['Monday', "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"]

    year = 1996

    month = 10

    day = 27

    x = calendar.weekday(year, month, day)

    print("Weekday number:", x)

    print("Weekday name:", wday[x])

    Output

    输出量

    Weekday number for the given date: 3

    Weekday number: 6

    Weekday name: Sunday

    Note: The date in the function argument should be valid, otherwise it will raise a ValueError.

    注意:函数参数中的日期应有效,否则将引发ValueError 。

    For example, if you print 31 September 2019, this will be wrong as September has only 30 days.

    例如,如果您打印2019年9月31日 ,这将是错误的,因为9月只有30天。

    Example:

    例:

    # Python program to illustrate the

    # use of weekday() method

    # importing calendar module

    import calendar

    year = 2019

    month = 2

    day = 29

    x = calendar.weekday(year, month, day)

    print("Weekday number for the given date:", x)

    print()

    Output

    输出量

    Traceback (most recent call last):

    File "main.py", line 11, in

    x = calendar.weekday(year, month, day)

    File "/usr/lib/python3.8/calendar.py", line 117, in w

    eekday

    return datetime.date(year, month, day).weekday()

    ValueError: day is out of range for month

    翻译自: https://www.includehelp.com/python/calendar-weekday-method-with-example.aspx

    展开全文
  • WEEKDAY函数
  • VB weekday()函数的用法?

    2021-05-07 01:14:04
    使用WEEKDAY函数计算某天为星期几。语法:WEEKDAY(serial_number,return_type)serial_number 是要返回日期数的日期,它有多种输入方式:带引号的本串(如"2001/02/26")、序列号(如35825 表示1998 年1 月30 日) 或...
  • 可以使用交叉表和透视表,来直观的看出两个变量的数值关系。本文以某一段时间的股票数据为例,创建星期几weekday和股票涨幅交叉表与透视表来直观看两个特征之间的关系。 代码过程 import pandas as pd pd.set_option...
  • WEEKDAY函数

    千次阅读 2021-01-29 18:26:08
    本文介绍 WEEKDAY 的公式语法和 用法 函数。 返回对应于某个日期的一周中的第几天。 默认情况下,天数是 1(星期日)到 7(星期六)范围内的整数。 语法 WEEKDAY(serial_number,[return_type]) WEEKDAY 函数语法...
  • 本文整理汇总了Python中calendar.weekday方法的典型用法代码示例。如果您正苦于以下问题:Python calendar.weekday方法的具体用法?Python calendar.weekday怎么用?Python calendar.weekday使用的例子?那么恭喜您,...
  • 某日发现 DateTools 的 weekday 方法在不同 iOS 上计算出的结果不一样的问题。具体表现为:在 iOS 10 上计算出的结果比 iOS 12 上的结果少一天。比如同样是 2019-09-23,iOS 10 上计算结果为 1,而 iOS 12 上计算...
  • Python datetime.weekday()方法 (Python datetime.weekday() Method) datetime.weekday() method is used to manipulate objects of datetime class of module datetime. datetime.weekday()方法用于操作模块...
  • 设计一个Weekday类,成员函数SetDay()设置星期几,IncDay()前进一天,NowDay()打印当前是星期几。‪‬‪‬‪‬‪‬‪‬‮‬‭‬‪‬‪‬‪‬‪‬‪‬‪‬‮‬‪‬‫‬‪‬‪‬‪‬‪‬‪‬‮‬‫‬‭‬‪‬‪‬‪‬...
  • 带有示例的Python date weekday()方法

    千次阅读 2020-07-20 22:23:53
    Python date.weekday()方法 (Python date.weekday() Method) date.weekday() method is used to manipulate objects of date class of module datetime. date.weekday()方法用于操作模块日期时间的日期类的对象。 ...
  • python weekday()函数

    万次阅读 2018-09-12 06:59:38
    weekday()函数返回的是当前日期所在的星期数。 from datetime import date a = date(2018,9,12) print(a.weekday()) 输出: 2 Process finished with exit code 0 然而这不准,有谁知道为啥?...
  • MySQL weekday()函数

    万次阅读 2018-09-08 13:39:21
    转载自 MySQL weekday()函数 WEEKDAY函数返回一个日期的工作日索引值,即星期一为0,星期二为1,星期日为6。 以下说明了WEEKDAY函数的语法: WEEKDAY(date) WEEKDAY函数接受1个参数,即DATE或DATETIME值,它...
  • mysql之weekday函数功能说明weekday函数功能说明:weekday函数用于返回一个日期在工作日的索引值weekday函数语法:weekday(d)-----参数值说明---d:必填项为一个date或datetime值,当我们输入一个无效的日期值时,则...
  • 本题还要求编写将从控制台输入的字符串转化为WeekDay类型变量,然后使用swith根据该变量执行相应代码。 最后,本题要求输出统计结果,并得到WeekDay的常量数组,然后对其进行排序并输出。以下为代码框架,请在相应...
  • 公元纪年的来历 公元是“公历纪元”的简称,是国际通行的纪年体系。以传说中耶稣基督的生年为公历元年(相当于中国西汉平帝元年)。...因此我们可以依此为基准,用某天的年月日推算出这一天是星期几(WEEKDAY)。
  • 关于datepart计算weekday时多一天引起的问题及解决方法
  • 本题还要求编写将从控制台输入的字符串转化为WeekDay类型变量,然后使用swith根据该变量执行相应代码。 最后,本题要求输出统计结果,并得到WeekDay的常量数组,然后对其进行排序并输出。以下为代码框架,请在相应...
  • 第一,excel中weekday 函数用法介绍weekday函数主要功能:给出指定日期的对应的星期数。weekday函数使用格式:WEEKDAY(serial_number?return_type)weekday函数参数说明:serial_number代表指定的日期或引用含有日期...
  • mysql 时间转换函数的用法 DAYOFWEEK(date) 返回日期date的星期索引(1=星期天,2=星期一, ……7=星期六)。这些索引值对应于ODBC标准。 mysql> select DAYOFWEEK(2007-10-31); -> 4 WEEKDAY(date) 返回date...
  • 摘要:下文讲述使用Python代码中calendar.weekday(year,month,day)函数的功能说明,如下所示:calendar.monthrange功能说明:calendar.weekday(year,month,day)方法用于返回指定年份,月份,日期对应的星期数calendar....
  • mysql 日期函数

    千次阅读 2021-02-05 01:11:58
    1、mysql DAYOFWEEK 和 WEEKDAY获取星期在mysql中,我们可以用DAYOFWEEK 和 WEEKDAY函数获取指定日期的星期。区别在于DAYOFWEEK获取的星期索引是以1开始,而WEEKDAY获取的星期索引是以0开始.DAYOFWEEK(date)返回日期...
  • #当前时间weekday(date) #返回日期的星期索引(0=周一,1=周二,,,6=周日)subdate(date,间隔天数) #从指定日前减去几天 注意:当第二个参数为负数时,减去负数相当于加,这时表示从指定日期加上几天。date_format...
  • “日历”模块中定义的函数和类使用理想化的日历,当前的公历日历在两个方向上都无限期扩展。在Python中,calendar.firstweekday()是日历模块中提供的用于简单文本日历的功能。firstweekday()方法用于获取每周开始的...
  • weekday = 1时,返回Set:[1, 2, 3, 4, 5, 6, 7] weekday = 2时,返回Set:[2, 3, 4, 5, 6, 7, 1] weekday = 3时,返回Set:[3, 4, 5, 6, 7, 1, 2] weekday = 4时,返回Set:[4, 5, 6, 7, 1, 2, 3] weekday = 5...
  • 使用pandas将时间类型转换为DatetimeIndex后想通过weekday_name方法得到具体日期是星期几时报错 报错的提示是:AttributeError: ‘DatetimeIndex’ object has no attribute 'weekday_name’ 解决方案1:回退...

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