sql server aggregate functions

Windows functions in SQL Server 2005 (window function) are not related to Microsoft Windows; Instead, they create data windows. Window functions help you quickly look at different levels of aggregation, which make it easy to recover cumulative totals, move averages, and perform other calculations. A

: Select replace (' AB ', ' abcdef ', ' H ') Date-time functions GETDATEGets the date and time of the current SQL Server serverUse: Select GETDATE () getUTCDateGets the UTC time of the current SQL Server serverUse: Select getUTCDate () YearGet year information for a dateSynt

the location of a table reference in a Transact-SQL statement. Security functions Returns information about users and roles. String functions You can change the values of char, varchar,nchar,nvarchar,binary, and varbinary. System functions Manipulate or rep

) ODBC specification (with milliseconds) Yyyy-mm-dd hh:mi:ss.mmm (24h) 126 (4) ISO8601 Yyyy-mm-ddthh:mi:ss.mmm (no spaces) 127 (6, 7) The ISO8601 with time zone Z. Yyyy-mm-ddthh:mi:ss.mmmz (no spaces) 130 (+) Hijri (5) DD Mon yyyy hh:mi:ss:mmmAM 131 (2) Hijri (5) Dd/mm/yy Hh:mi:ss:mmmAM Select CONVERT (varchar), GETDATE (), 8): 10:57:46Select CONVERT (varchar

Label:SQL Server Basics (1) Create a database There are two ways to create a database, manually create and write SQL script creation, where I use a script to create a database called TSQLFundamentals2008. The script is as follows: View Code While inserting some data into the database table, the user follows the SQL practice of the database. In this case, you can

'))--go to right space 7 Select nchar( the)--return Unicode characters Select REPLACE('ABCDA','a','BBB')--Replace A with the BBB bbbbcdbbb SELECT STR(1234.56,6,1 ) --counting starting from 1 SELECT STUFF('abcdef',2,3,'IJKLMN')--Aijklmnef Select SUBSTRING('FSDFSD',2,2) SD----Type conversion Select CAST('123' as int)--123 Select CONVERT(int,'123')--123 Select CAST(123.4 as int)--123 Select CONVERT(int,123.4)--123 Select CAST('123.4' as int) Select CONVERT(int,'123.4') --Conversion failed whe

Extracts some of the functions commonly used by SQL Server to facilitate daily learningOne, character conversion function1. ASCII ()Returns the ASCII value of the leftmost character of a character expression. In the ASCII () function, a string of pure numbers is not "enclosed", but a string with other characters must be used in ' surround ', or an error will occu

A function is a subroutine composed of one or more statements. It can be used to encapsulate code for reuse. System FunctionsGroupBuilt-in functionsTo perform operations on values, objects, and settings in SQL Server, and return information about them. SQL Server basic functions