datediff in postgresql

function | DateDiff function DescribeReturns the time interval between two dates.GrammarDateDiff (interval, date1, date2 [, firstdayofweek][, FirstWeekOfYear]])The syntax for the DATEDIFF function has the following parameters: Parameter descriptionInterval must be selected. A string expression that is used to calculate the time interval between Date1 and Date2. For numeric values, see the "Settings" sec

DateDiff function Returns a Variant (long) that represents the number of time intervals between two specified dates. Grammar DateDiff (interval, date1, date2[, firstdayofweek][, FirstWeekOfYear]) The following named arguments are in the DateDiff function syntax: Partial description Interval necessary. A string expression that represents the interval used to

The DateDiff () function returns a time between two dates, syntax: DateDiff (datepart,startdate,enddate)[visit_time]== User access timeThis week: DateDiff (Week,[visit_time],getdate ()) =0Last two weeks: DateDiff (W,[visit_time],getdate ()) Last month: DateDiff (M,[visit_tim

--getdate Current system date, timeSelect getdate()--2014-11-24 13:22:40.407--the CONVERT () function can display date/time data in different formatsSelect Convert(varchar( -),getdate(), at)--2014-11-24--DateDiff Returns the number of date and time boundaries across two specified datesSelect DateDiff( Day,'2014-11-24','2014-12-28')-- theSelect DateDiff(Month,'201

Mysql function usage record (1) -- DATEDIFF, CONCAT, datediffconcat So far, I have not used Mysql functions in a unified way, and I have used them all before learning. Recently, I began to learn about Linux, so in order to prevent the Mysql functions encountered in this phase from being forgotten after the end of this period, I began to make a simple record here. My friend asked me to help me read an SQL statement before leaving work yesterday. It is

Tags: style blog color ar sp div art C onSelect DateDiff( Year, start date, end date);--Two date interval yearSelect DateDiff(Quarter, Start date, end date);--Two date interval seasonSelect DateDiff(Month, start date, end date);--Two date interval monthSelect DateDiff( Day, start date, end date);--Two date interval day

Label:Grammar: DATEDIFF (datepart,startdate,enddate) The datepart parameter can be the following value: Date-part:year | Quarter | Month | Week | Day | Hour | Minute | Second | Millisecond The parameter date-part specifies the date portion of the interval to be measured. DatePart Abbreviations Years YY, yyyy Quarter QQ, Q Month MM, M The day of the year

I want to make a search today and use the time comparison function! In the past, it was usually a direct comparison time, and the query statement was not highly efficient ~~~ Later, I used the DateDiff function and found some problems during debugging. I would like to summarize some of the issues with mongo_^ 1 and the database. The Access and SQL read time functions are different. Now () only allow I want to make a search today and use the time compa

DateAdd function: Copy Code code as follows: function DateAdd (interval,number,date) { Switch (Interval.tolowercase ()) { Case "Y": Return new Date (Date.setfullyear (Date.getfullyear () +number)); Case "M": Return new Date (Date.setmonth (Date.getmonth () +number)); Case "D": Return new Date (Date.setdate (Date.getdate () +number)); Case "W": Return new Date (Date.setdate (Date.getdate () +7*number)); Case "H": Return new Date (Date.sethours (date.gethours () +number)

Town Field Poem:——— Dream who feel, the water month Build blog. Baiqian tribulation, only know the vicissitudes of the world.——— today holds the Buddhist language, the technology is boundless willing to learn. Willing to do what you learn, cast a conscience blog.——————————————————————————————————————————1 Code1 --View the current time for easy comparison2 Select getdate()3 Select DateDiff( Year,'1996-11-01',getdate())4 Select

The DATEDIFF () function returns the number of days between two dates. Grammar The DATEDIFF (datepart,startdate,enddate) startdate and EndDate parameters are valid date expressions. Use the following SELECT statement: The code is as follows Copy Code SELECT DATEDIFF (Day, ' 2008-12-29 ', ' 2008-12-30 ') as diffdate result:Diffdate1

For information about datediff, see: Datediff (datepart, startdate, enddate) Datepart Is part of startdate and enddate of the specified cross-border type. The following table lists all valid datepart parameters. The user-defined equivalent variable is invalid. Datepart Abbreviations Year YY, yyyy Quarter

If today is January 2011, I would like to know from March 2010, calculate this is a few months the best answer DateDiff ("M", "2010-03-01", "2011-01-01")DateDiff function Function: Returns the time interval between two dates. Syntax: DateDiff (interval, date1, date2 [, firstdayofweek][, FirstWeekOfYear]]) Syntax parameters: Interval must be selected. A strin

SELECT DATEDIFF (year, ' 1992-11-28 ', GETDATE ())--age, where year can be replaced by day MONTHSELECT DATEPART (Month,getdate ())-Returns an integer representing the specified date portion of the specified date. such as 12SELECT datename (WEEKDAY, ' 2014-11-12 ')--Returns the specified day of the week, such as Monday,SELECT Datename (Weekday,getdate ())--Returns the current date is the day of the weekSELECT Datename (Week,getdate ())--Returns the cur

What I'm going to introduce today is a function that converts time (for example: 2008-8-8 13:45:22) into seconds in ASP, and the opposite of converting seconds to time. Of course when the time is converted. Must have a relatively fixed time, that is GMT. Think about it. Because Greenwich Mean Time is "January 1, 1970 00:00:00" Start, ASP provides a function called DateDiff (), this function can return a time difference of seconds, That means we put in