SQL Server 中的 DATENAME()函数

原文:https://www . geesforgeks . org/datename-function-in-SQL-server/

DATENAME()功能:

SQL Server 中的这个函数用于查找指定日期的给定部分。此外，它以字符串形式返回输出值。

功能:

  • This function is used to find the given part of the specified date.
  • This function belongs to the date function.
  • This function accepts two parameters, namely interval and date.
  • This function can also include the time in the date part.
  • This function returns the output as a string.

语法:

DATENAME(interval, date)

参数:

该方法接受两个参数，如下所示。

  • interval– is the designated part to be returned. In addition, the value of the interval can be given as follows.
year, yyyy, yy   = Year, which is the specified year.
quarter, qq, q   = Quarter, which is the specified quarter.
month, mm, m     = month, which is the specified month.
dayofyear, dy, y = Day of the year, which is the specified day of the year.
day, dd, d       = Day, which is the specified day.
week, ww, wk     = Week, which is the specified week.
weekday, dw, w   = Weekday, which is the specified week day.
hour, hh         = hour, which is the specified hour.
minute, mi, n    = Minute, which is the specified minute.
second, ss, s    = Second, which is the specified second.
millisecond, ms  = Millisecond, which is the specified millisecond.
  • Date– is the specified date to be used.

返回:

它返回指定日期的给定部分。

示例-1 :

使用 DATENAME()函数并获取指定日期的年份部分。

SELECT DATENAME(year, '2021/01/06');

输出:

2021

示例-2 :

使用 DATENAME()函数并获取指定日期的月份部分。

SELECT DATENAME(month, '2021/01/06');

输出:

January

示例-3 :

使用 DATENAME()函数并获取指定日期的日部分。

SELECT DATENAME(day, '2021/01/06');

输出:

6

示例-4 :

使用 DATENAME()函数并获取指定日期的小时部分，其中也包括时间。

SELECT DATENAME(hour, '2021/01/06 05:30');

输出:

5

示例-5 :

使用 DATENAME()函数并获取指定日期的第二部分，其中包括时间以及使用变量。

DECLARE @date VARCHAR(50);
SET @date = '2019/06/05 07:37:54';
SELECT DATENAME(second, @date);

输出:

54

应用:

该函数用于查找指定日期的给定部分。

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