sql server aggregate functions

yearSelect Datename (WEEKDAY, ' 2016-8-31 ')--datepart is equivalent to Datename, the difference is that Datename returns a string, and DATEPART returns an int typeSelect DATEPART (WEEKDAY, ' 2016-8-31 ')--1 is Sunday, 7 is Saturday--Returns an integer that returns the year, month, and day of the dateSelect year (' 2016-8-31 ')Select month (' 2016-8-31 ')Select Day (' 2016-8-31 ')--Get local timeSelect GETDATE ()--No parameters required--Get the exact time of the systemSelect Sysdatetime ()--De

Oracle date functions/character functions/numeric functions/conversion functions/Aggregate functions Oracle date functions: [SQL] MONTHS_BET

Ggregate Functions (Transact-SQL) aggregation functionsAvg: Averaging pointsCount: Number of calculationsMax: Ask for maximum valueMin: Find minimum valueSum: SumFind Average heightSelect AVG (Shengao) from studentAs: Added column nameSelect AVG (Shengao) as average height from studentFind the numberSelect COUNT (*) from student where Xingbie = ' Male 'Ask for maximumSelect MAX (Shengao) from studentTo find

Oracle provides us with very rich aggregate functions, such as Sum\avg\max. In addition, we can write our own aggregate functions, of course, custom aggregate functions can also be used as analytic

Oracle Aggregate functions has been used a lot. The official website is described as follows: Aggregate functions Http://docs.oracle.com/cd/E11882_01/server.112/e26088/functions003.htm#SQLRF20035 Aggregatefunctions return a single result row based on groups of rows, rather

Custom Aggregate functionsIntroduction to custom aggregate function InterfacesOracle provides many predefined Aggregate functions, such as Max (), Sum (), AVG (), however, these predefined Aggregate functions are basically applica

Tags: Oracle SQL Report SELECT aggregate functionaggregate functions in Oracle usage of Count, max, Min, Sum, AVG, and NVL functionsThe Grouping function aggregate function performs a calculation on a column in a set of rows and returns a single value. The aggregate function

Label:Original: SQL Server function Full solution One: Data type conversion functionWhen you work with values of different data types at the same time, SQL Server typically automatically makes a hermit type conversion. Values that are similar to data types are valid, such as int and float, but for other data types, suc

function adds an over keyword after the aggregation function.The call format for the window function is: function name (column) over (option)I am using SQL Server R2, and I do not know when to start, SQL Server also supports the use of the ORDER BY clause in the window function (note: The book says that MSSQLServer is

Document directory 8.2 application of Aggregate functions 8.2.3 Maximum/minimum functions-max ()/min () 8.2.4 mean function -- AVG () 8.2.5 processing of aggregated analysis values 8.2.6 combination of Aggregate functions 8.2 application of

Introduction to custom aggregate function interfaces Oracle provides a number of predefined aggregate functions, such as Max (), Sum (), AVG (), but these predefined aggregate functions are basically adapted to scalar data (scalar), for complex data types, such as user-defi

SQL Server Functions and stored procedures, SQL Server Stored Procedures The SQL Server function is a structure that encapsulates one or more SQL