sql server scalar function example

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 ')Role: The function returns the ID value of the specified object and can be validated in the sysobje

The instance explains the usage of the SQL server ranking function DENSE_RANK, And the instance explains dense_rank. I. Requirements Previously, the ranking function of SQL server used RoW_NUMBER () most. I usually use ROW_NUMBER

@objRegExp return null End EXEC @hr = sp_OADestroy @objRegExp IF @hr return null End Return @result End /* Configuring support for extended stored procedures Microsoft SQL Server-> Configuration Tool-> Perimeter application configuration-> configuration-> OLE Automation: Support for OLE Automation Use Example 1: Copy Code code as follows:

As the data grows, the database grows, and the disk space increases and the performance decreases. The data compression function of SQL Server 2008 can greatly reduce the data volume and improve query performance, especially for data warehouses. (Bestpractices for data warehousing with SQL

Tags: filtering order by with BLE case when database http create numberSome usage of SQL partition by field First look at the example: If object_id (' TESTDB ') is not null drop table TESTDB CREATE TABLE TESTDB (A varchar (8), B varchar (8)) INSERT INTO TESTDB Select ' A1 ', ' B1 ' UNION ALL Select ' A1 ', ' B2 ' UNION ALL Select ' A1 ', ' B3 ' UNION ALL Select ' A2 ', ' B4 ' UNION ALL Select ' A2 ', ' B5 '

Does SQL server allow simple copy to back up database data and log files? The answer is yes. However, the premise is that data files are no longer used by SQL Server. When the database is active, you cannot simply copy its files. We recommend that you use full database backup (Backup Type ). This is because the databas

-- SQL Regular Expression replacement functionCopy codeThe Code is as follows:CREATE function dbo. regexReplace(@ Source ntext, -- original string@ Regexp varchar (1000), -- Regular Expression@ Replace varchar (1000), -- replace value@ GlobalReplace bit = 1, -- whether it is a global replacement@ IgnoreCase bit = 0 -- ignore case sensitivity)ReturnS varchar (1000)BeginDeclare @ hr integerDeclare @ objRegExp

Server Date functionDefinition and usageThe DATEDIFF () function returns the number of days between two dates.GrammarDATEDIFF (datepart,startdate,enddate)The startdate and enddate parameters are valid date expressions.The datepart parameter can be the following value: DatePart Abbreviations Years YY, yyyy Quarter QQ, Q Month MM

Next 4. Conditional SelectionUPDATE. For example, the following update conditions are available: For employees with a salary of more than 5000, the salary is reduced by 10%. Employees with salaries between 2000 and 4600 increase by 15% You can easily choose to execute two UPDATE statements, as shown below: -- Condition 1 Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->UPDATE PersonnelSET salary

where UserName like ' Zhang [0-9] sister '/' Zhang [A-z] sister '/' Zhang [0-9a-z] sister '; [A-z] The default collation is case-insensitive, so the case can be written out ^ (non): select * from Users where UserName like ' Zhang [^0-9] sister ' (middle not number)/not like ' Zhang [0-9] sister ' (do not take ' Zhang [0-9] sister ' data); Note: 14.null Value Processing ①sql null cannot be calculated with =/!=; ②is null/is NOT NULL; ③ any value with

Grammar REPLACE (' String_expression1 ', ' string_expression2 ', ' String_expression3 ') Parameter description ' String_expression1 ' The string expression to search for. String_expression1 can be either character data or binary data. ' String_expression2 ' The string expression to find. String_expression2 can be either character data or binary data. ' String_expression3 ' The string expression to replace. String_expression3 can be either character data or binary data. Popular understanding is

In the AWR report, it was found that a SQL is inefficient:Select Batch_status from T_batch_infowhere batch_status= ' 0 'and sys_id= ' STM06 ';View execution Plan Discovery the query takes advantage of the index, which contains the Batch_status field, but with the following SQL query:Select Batch_status,count (*) from T_batch_infoGROUP BY Batch_statusThere are few values found for the Batch_status field:Batc

Tags: io ar using SP on data Art BS timeIn SQL SERVER 2005/2008, two types of ranking window functions and clustered window functions are supported.For example, in SQL Server, the order number is listed in chronological order.With OrderInfo as(SELECT row_number () over (ORDE

Let's take a short time to introduce SQL rounding round functions SQL Rounding 2007/11/01 16:35 question 1: Will get 123 (will be omitted after the decimal point). If you want to get two digits after the decimal point. You need to change the above SELECT CAST (' 123.456 ' as Decimal (2)) ===>123.46 It's automatically rounded! Question 2: SELECT ROUND (123.75633,

1. Left ()Left (Returns the integer_expression character from the left of character_expression.[SQL]View PlainCopy Select Left (' abcdef ', 3) [SQL]View PlainCopy --abc 2.charindex ()CHARINDEX (Returns the beginning of the occurrence of a specified substring in a string.Where substring _expression is the character expression to look for, expression can be a string or a column na

purchase, that is, to obtain a view, as shown below: Serial number Name Item Summary 1 Zhang San Print paper, computer 2 Li Si Clothes, mobile phones Because you want to get a view, you cannot display it in the storage process. You only need to use functions. Of course, you can also query the purchased items one by one on the client based on the query results, however, multiple round-trips to the C/S end will affect the speed of creating a vie

syscolumns A,syscolumns bGO--string spin-off processing functionCREATE FUNCTION F_splitstr (@s varchar (8000),--string to be split@split varchar (10)--Data delimiter) RETURNS TABLEAsRETURN (SELECT Col=cast (SUBSTRING (@s,id,charindex (@split, @[email protected],id)-id) as varchar (100))From Tb_splitstrWHERE Idand CHARINDEX (@split, @[email protected],id) =id)GO --Method 4: Use SQL server2005 outer APPLY C

Substring function is used for SQL Server operations.SUBSTRING (expression, start, length)ParametersExpressionString, binary string, text, image, column, or expression that contains a column. Do not use expressions that contain aggregate functions.StartAn integer or expression that can be implicitly converted to an int indicates the start position of the substrin

Substring function is used for SQL Server operations. Substring (expression, start, length) ParametersExpressionString, binary string, text, image, column, or expression that contains a column. Do not use expressions that contain aggregate functions. StartAn integer or expression that can be implicitly converted to an int indicates the start position of the

A string that requires a location in the string AA,DD,CC,RR,FFF is easily implemented in C # or Java by split, but there is no direct split function in SQL Server. Of course, such problems can always be solved. ALTER function [dbo]. [Core_split](@str varchar (100),@split char (1),@index int)Returns varchar (a) ASBegi