sql server scalar function example

SQL Server aggregate functions in the actual work to deal with a variety of requirements are still very extensive, for the optimization of aggregate functions has become a focus, a program optimization of the good or bad directly determines the program's declaration cycle. The SQL Server aggregate

Reply content:My principle is: can put in PHP all put into PHP, DB (such as MySQL) only put data, not put logic (foreign KEY constraints, stored procedures, etc.). Use MySQL, but remember which database you use can be changed at any time, so especially don't use some of the logic-related features that MySQL supports. Specific problems specific analysis of the current performance bottlenecks are seen in the database layer, the horizontal expansion of the relational database although in the devel

Tags: function apply arc font var. project Bubuko GPO Body Count SELECT * from Tbiz_projectrelation Target statistics each project has several application records Step1 SELECTProjectID, Relationids= STUFF((SELECT ',' + CONVERT(VARCHAR,[Relationid]) fromTbiz_projectrelation TWHEREProjectID=T1. ProjectID forXML PATH ("')),1,1,"') fromTbiz_projectrelation T1 Step2 SELECTProjectID, Relationids= STUFF((SELECT ',' + CONVERT(VARCHAR,[Relationid]) fromTbiz

Introduction to the RAND function in SQL Server and Implementation of the interval random numeric function, During work, you will encounter tasks such as SQL Server simulated data generation and random filling of numeric column va

Tasks such as SQL Server simulation data generation and random padding of numeric column values such as Integer, date, and time data types are encountered in the work, and are used to random numbers in these tasks. In view of this, this article will be a simple summary of the use of random numbers in SQL Server.three functions related to T-

function command execution results:Charindex (SQL, microsoft SQL server)This function command returns the starting position of "SQL" in "microsoft SQL

SQL Server has an SQL profiler that can track the SQL statements executed by the server in real time, which is useful in many times for debugging errors. For example, the complexity of othersCode, Production system, no debugging e

Label:With the release of EF5, a new support for database (SQL Server) UDF is available, depending on the following connection: Https://msdn.microsoft.com/en-us/data/hh859577.aspx, This feature is also inherited by the newly released EF6. The problem is that this UDF seems to be just for tvf-table Value function, but unfortunately, it cannot be imported when tryi

As we all know, in C #, it is easy to use the split method to divide a string into an array with the specified characters, but in T-SQL, it is .... In my project, there are the following applications: Read a batch of data in batches, then process the data in each row. After processing, return the processed ID and the failed ID to the database, this involves a batch update problem. Do you want to write IDs one by one for batch processing and update the

int,tpr_title nvarchar (MB), Tpr_pubdate datetime) As BEGIN DECLARE @a varchar (10) SELECT @a = xx from xx WHERE xx = @type INSERT @Table SELECT xx,xx,xx from tablename WHERE XX = @a--The number of columns defined in the table variable is the same as the number of values Return End If you do a multiple-table operation, you can define table variables in the function body to hold the result set and then associate the query.

procedure", a template-based creation statement will appear. Click "query> specify template parameter value" in the menu to bring up a dialog box to set the template and create the stored procedure. In addition, click "View> template resource manager" in the menu to view the various SQL statement templates provided by SQL SERVER. [A simple

Use of the SQL Server replace functionREPLACEReplaces all occurrences of the second given string expression in the first string expression with a third expression.GrammarREPLACE (' String_replace1 ', ' string_replace2 ', ' string_replace3 ')Parameters"' String_replace1 'The string expression to search for. String_replace1 can be either character data or binary data."' String_replace2 'The string expression

Top keyword: write in front of the field after selectFor example, you want to display the first 5 records of a query, as follows:Select Top 5 * from StudentIn general, top is the same as the order byOrder by uses the order by after the name of the table to fill in the fields you want to sort by, in ascending order (from small to large)Percent: Percent%=percentFor example, to display 5% of data processing, c

Label:Because I am using. NET C # for development, I usually use SQL Server's NEWID () function to generate the ID of the data. Guid.NewGuid () is also easy to use in the C # language. The ToString () method to generate the same ID as the format. Now that the database has been replaced with Oracle, there is no such function that can be easily called, but Oracle h

In-depth analysis of the nvl function of Orcale and the isnull function of SQL Server, orcalenvl Nvl function of Orcal NVL (Expr1, Expr2) If Expr1 is NULL, the value of Expr2 is returned. Otherwise, the value of Expr1 is returned. If both Expr1 and Expr2 are NULL, NULL is

(SUM (Size) as float)/128 from Sys.master_files WHERE database_id = a.database_id) as [TotalSize (MB)], a.physical_name as File_path from sys.master_files ainner JOIN SYS.D Atabases B on A.database_id = b.database_id--form function (19%) SELECT a.database_id as [db_id], b.name as [db_name], b.create_date, case A.type when 1 Then ' Log ' ELSE ' Data ' END as File_type, CAST (a.size as FLOAT)/128 as [Size (MB)]--Size in pages (8 KB) , CAST (SUM (s

The NVL function of orcalNVL (EXPR1,EXPR2) If EXPR1 is null, returns the value of EXPR2, otherwise returns the value of EXPR1, EXPR1,EXPR2 null returns null nvl2 (EXPR1,EXPR2,EXPR3) If EXPR1 is null, Returns the value of EXPR2, otherwise returns the value of EXPR3 nullif (EXPR1,EXPR2) If the values of EXPR1 and EXPR2 are equal, returns NULL, Otherwise returns the value of Expr1 coalesce (Expr1, EXPR2, Expr3 ..... EXPRN) represents a placehol

In SQL Server database, if the query database has the index of the specified name or foreign key constraints, etc., often use the object_id (' name ', ' type ') method, take notes as follows:? Syntax: object_id (' objectname ') or object (' objectname ', ' type '): The function returns the ID value of the specified object and can be validated in the sysobjects ta

The date and time functions in SQL Server are always problematic in this regard. So, I will summarize what I mainly useDatepart(Month, getdate (). This item can be set to day (now () in access. Unfortunately, the day () in SQL Server does not support parameters.Date and time functions in

by SalesOrderID) as ' Max 'From SalesOrderDetailWHERE SalesOrderID in (43659,43664); The following example is first aggregated by the SalesOrderID partition and calculates the percentage of ProductID per row for each SalesOrderID. SELECT SalesOrderID, ProductID, OrderQty, SUM (OrderQty) over (PARTITION by SalesOrderID) as ' total ', CAST (1.0 * orderqty/sum (OrderQty) over (PARTITION by SalesOrderID)*100 as DECIMAL (5,2)