This article describes some common time and date processing functions in SQL, including the-DATEPARTDATEDIFFCONVERTgetdate () DATEADD functions.
This article describes some commonly used time and date processing functions in SQL, including the-DATEPART DATEDIFF CONVERT getdate () DATEADD functions.
-- Get the curren
Tags: personal diff function current time Division PST EDA ROM date ted /*
staff: LDH
function: sql-Several date functions
date: 2018-7-20
*
/Use TSQLFundamentals2008;
GO
SELECT OrderID,
OrderDate
from Sales.orders; SELECT TOP(8) OrderID, OrderDate fromsales.ordersWHEREOrderDate> '20080301'; SELE
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Now use this knowledge to solve my problems, the first is the daily Statistics reported, accurate to the date limit: convert (varchar (one), Reporttime, 20) that is YYYY-MM-DD
The group by problem is then resolved with the SQL code:
Copy Code code as follows:
Select Reportperson,convert (varchar, reporttime,) as ' Reportime ', COUNT (*) as reporttotal from Pcr_constructinfo Where (repo
Dateadd
Returns the newDatetimeValue. Syntax
Dateadd( Datepart, Number, Date) Parameters
Datepart
Is a parameter that specifies which part of the date should be returned to the new value. The following table lists the dates and abbreviations recognized by Microsoft SQL Server.
Date
Abbreviations
Inter-function 1. Get the current date getdateThe GETDATE () function returns the date and time of the computer on which the current SQL Server servers are located, in the format of the datetime data type. Its syntax format is GETDATE (). The return value is rounded to the nearest fractional fraction of the second, with a precision of. 333 seconds the database 1
SQL Server date Formatting Function SQL
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A very powerful date Formatting Function in SQL Server
Select convert (varchar (100), getdate (), 0): 05 16 2006 AM
Select conve
Sometimes want to generate a sequence by day or month, just like 2014-1-1, 2014-1-2, 2014-1-3 ...In SQL Server, you can write a function to implement./*generate a date range, such as 2014.01, 2014.02 ... @Increment step value @startdate Start date @enddate End Date----------
The Mktime function in PHP is queried by time, in fact, in addition to this solution, there are also functions specifically for date and time in MySQL, including date (), Date_add (), Date_sub (), Date_format (), and so on.
The code is as follows
Copy Code
Orders in the last three months, the SQL statement is as follows:$
In SQL Server, there are multiple methods to compare date fields. Several common methods are introduced:
Use the Employees table in the northwind database as the use case table.
1. Use the between... and statement:
Description: between... and is used to specify the test scope.
See the following example:
Execute the SQL statement "select hiredate from employees" a
number of date and time boundaries across two specified dates. Select DateDiff (Day, ' 2004-09-01 ', ' 2004-09-18 ')--return: 17 4. DatePart returns an integer representing the specified date portion of the specified date. SELECT DATEPART (month, ' 2004-10-15 ')--return 10 5. Datename returns a string representing the
A long time did not write blog, not lazy, it is recently my visit speed is not good, with Firefox often can't upload pictures ....I didn't mean to find out today. SQL Server Datetime Cast to Date type you can use the index to share:Test environment:Use TEMPDBGOCREATE TABLE TB(ID INT IDENTITY (PRIMARY KEY),NAME VARCHAR (200),OPTIME DATETIME DEFAULT GETDATE ())GODECLARE @i INT = 1While @iBEGININSERT into TB (
// Synchronize the time and date of the SQL _server Server
Procedure TDM. synchronizationsqlserverdatetime ();
VaR
Theserverdatetime: tdatetime; // defines the server time
Thelocaldatetime: _ systemtime; // defines the local system time reference windows
Year, month, day: word; // defines the year, month, and day.
Hour
SQL Server and Oracle acquisition time and date difference1. Get System Current TimeSQL Server 2005:
Select GETDATE ()
The GETDATE () function returns the current time and date from SQL Server.
GrammarGETDATE () instanceExample 1Use the following SELECT statement:
Select GETDATE () as currentdatetime result:
Curre
1, the common date method (below getdate () = ' 2006-11-08 13:37:56.233 ')(1) Datename (datepart, date)Returns a String that represents the specified date portion of the specified date. DatePart See the list below.SELECT Datename (Day,getdate ()) – returns 8(2) DATEPART (DATEPART,
The default datetime format for ms SQL Server Chinese edition is yyyy-mm-dd hh: mm: Ss. Mmm
Long/short Date Format
CopyCode The Code is as follows: -- short Date Format: yyyy-m-d
Select Replace (convert (varchar (10), getdate (), 120), N'-0 ','-')
-- Long Date Format: yyyy-mm-dd
Select stuff (convert (char (8), getdat
Label:Select GETDATE () as ' current date ',Datename (Year,getdate ()) as ' year ',Datename (Month,getdate ()) as ' month ',Datename (Day,getdate ()) as ' Day ',Datename (Dw,getdate ()) as ' Week ',Datename (Week,getdate ()) as ' Week number ',Datename (Hour,getdate ()) as ' when ',Datename (Minute,getdate ()) as ' min ',Datename (Second,getdate ()) as ' s 'Resul
', ' 2005-7-25 22:56:32 ') returns a value of 514,592 secondsDateDiff (' d ', ' 2005-07-20 ', ' 2005-7-25 22:56:32 ') returns a value of 5 days3.DatePart (' W ', ' 2005-7-25 22:56:32 ') returns a value of 2 that is Monday (Sunday is 1, Saturday is 7)DatePart (' d ', ' 2005-7-25 22:56:32 ') returns a value of 25, or 25thDatePart (' y ', ' 2005-7-25 22:56:32 ') returns a value of 206 that is the No. 206 Day of the YearDatePart (' yyyy ', ' 2005-7-25 22:56:32 ') returns a value of 2005 that is 200
Definition and usageThe DATEADD () function adds or subtracts a specified time interval from a date.GrammarDATEADD (datepart,number, date) The date parameter is a valid day expression. The number is the number of intervals you want to add, and for the future time, this is positive, and for the past time, this number is negative.The datepart parameter can be the following value:
DatePart
Work needs to query this month, the data this month to ranking, a closer look at the database tutorial in the database stored in the date format is 2010-02-23 14:2:3 This type, so I think the database by the second query method is not, find a date added to reduce SQL functio
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