how to check blank value in sql server

This is a question that is often asked. In particular, when using Oracle, the client would have a problem with SQL Server, which is that SQL Server behaves differently from Oracle on top of NULL values. In Oracle, a null value is considered to be an infinity

Label:The use of " ' " (single quotation marks): In SQL Server, two " ' " (single quotation marks) in the case of stitching strings, that is, the concatenation of a " ' " single quote string. The correct wording is given in this column: set @sql = update #temp_monthKQ_Users Set Day + @curruntCount + = + @descTemp + where user_id = + @u

server| function Identity (Identity) column, and many people call it the self-add column, in SQL Server 2000, the identity column is defined by identity, and here is an example of a function related to getting the identity value of the last inserted record In SQL

Http://www.cnblogs.com/annabook/p/3835436.html1.#region"Stored procedures in SQL Server process out return values"//Public void GetData ()//{ //string str = "SERVER=192.168.XXXX; user id=xxx; [Email protected]#;d atabase=xxxxx_db;min pool Size=4;max pool Size=4;packet size=3072 "; //SqlConnection conn = new SqlConnection (str); //Conn. Open (

, calculating the keyhashvalue will be very consuming performance This article:improvement in minimizing lockhash key collisions into SQL Server 2008r2 and its impact on concurrency Since the key to a row could is as large as 900 bytes, using the real key values would have inflicted larger memory Ption. Introduced The solution to this problem is found when designing

SQL Server scalar value function instance and cannot invoke cause analysis --scalar value function Set ANSI_NULLS on Go SET QUOTED_IDENTIFIER on Go -================================ ============= --Author: --Create Date: --Description: --============================================= Create function (--Ad

Tags: io using strong for file on C time SQLDateTime type on SQL server if you set a default value, and you want to use the default value when EntityFramework adds a new row, you cannot assign a value to the DateTime field of the newly added entity.However, if the newly adde

Tags: using AR data SP problem on BS database SQLIn the data we often encounter ntext large text type, this type if and nvarchar type addition can have problems, so there is a way to solve this problem.SQL functions used:TEXTPTR: Returns the value of the text pointer to the textual, ntext, or image data to be updated.UPDATETEXT: Change part of text, ntext, or image column in the appropriate locationWRITETEXT: To update and replace the entire text, nte

Null values are encountered by all database developers and administrators. Therefore, to develop successful applications, you must know how to handle these values. This article shares with you some of the techniques and techniques of null-value processing. Data integrity is the key to any database system. Regardless of how well the system is planned, the problem of NULL data values always exists. This article explores the 3 issues involved in handlin

Tags: decimal point index VAR technology does not convert SRC int typeSELECT * FROM table nameOrder BY Convert (int,left (column name, CHARINDEX ('. ', column name + '. ') -1) ASC, column name ASCCHARINDEX ('. ', column name) query first. (dot) in the number ofCHARINDEX ('. ', column name + '. ') Give no data to the last side Add. (points) This allows the first digit to be found without a decimal point.Left (column name, CHARINDEX ('. ', column name)) Query decimal valueLeft (column name, CHARIN

To achieve the following effect, is the most time after grouping the data:1. SQL Select * from (select *, row_number () through (PARTITION by Rip_guid ORDER by Ru_createdtime DESC) RN from Rip_flowinfo ) T WHERE t.rn 2. LINQ var groupquery = from T in query Group T by T.rip_guid to G select new {key = G.key, Source = g.orderbydescending (TT = Gt Tt.ru_crea

Here is the infor syteline 8.02 's self-defined function: Copy Code code as follows: Midnightof ALTER FUNCTION [dbo]. [Midnightof] ( @Date DATETIME ) RETURNS DATETIME As BEGIN Return (DATEADD (datepart, @Date), DATEADD (month, DATEPART (month, @Date)-1), DATEADD (DATEPART ( Day, @Date)-1), ' 2000 ')) End Here's the book. The method provided on page 86th: Copy Code code as follows: SELECT DATEADD (Day,datediff (Day, ' 20010101 ', current_tim

The service is OK, the Client Management tool opens an error and does not have to be re-installed.Workaround One:Open the directory "C:\Users\ your user name \appdata\local\temp\ ", or Run "%temp%" to open a file with a digital filenameDelete the file, and then build a folder with the same name.Workaround Two:The use of PsExec.exe open, the way is only available when the mode is opened, the symptoms do not cure.SQL Server R2 Open SSMS Administration t