how to update millions of records in sql server

SQL Server 2000 queries n to M records? (1) Select top M * From tablename where id not in (select Top n id from tablename) (2 ). Select top M * Temporary table (or table variable) from tablename order by columnname -- insert top M pen Set rowcount n Select * from Table variable order by columnname DESC (3 ). Select Top N * from (Select t

Data sheet: Bus_visitorstatics1, open the window function realization:SELECT*FROM (SELECT*, Row_number () OVER (partitionbyvisitordateorderbycountdesc ) AS ' num ' FROM BUS_VisitorStatics) astb1where NBSP;NBSP;NBSP;TB1.NUMNBSP; SQL Server records how many pages to fetch top N data

Wen/Xiachong Nightmare for Developers--delete duplicate recordsPresumably every developer has had a similar experience, and when querying or counting the database, the query and statistic results are inaccurate due to duplicate records in the table. The solution to this problem is to delete the duplicate records and keep only one of them.In SQL

server| Repeat | Repeat the following to illustrate the issue of duplicate record deletion. There are two duplicates of the record, one is a completely duplicate record, that is, all the fields are duplicate records, the second is some key fields duplicate records, such as the Name field repeat, and other fields do not necessarily repeat or repeat can be ignore

In general, we will configure the relevant connection string in the web. config file, which is recorded here for future use. 1. Commonly Used A: SQL Server Authentication connection stringView code 1 2 3 providername = "system. Data. sqlclient"> 4 B. Windows Authentication connection stringView code 1 2 3 providername = "system. Data. sqlclient"> 4 In addition, you can use Code: see the above. Method

Data exported to XML After SQL Server 2005, a FOR XML clause is provided to natively support XML in a relational database. This command enables you to convert a two-dimensional relational result set to XML, which can be saved as XML by using bcp. For example, the following data: We can export this to an XML file by using the following bcp command (note that you cannot have a carriage return) and

After the Windows host name is changed, a 14274 error occurs when you try to update or delete a job created before SQL Server2000. This error does not occur in SQL 7.0, but this error may also occur after the SQL 7.0 virtual server is upgraded to

1. number of records in each tableSelect A.name as Table name , Max (b.rows) as number of record strips From sysobjects A, sysindexes bwhere a.id=b.id and a.xtype= ' u 'GROUP BY A.nameORDER by Max (b.rows) desc2. Total number of recordsSelect SUM( number of records ) as total record Count from( 　　Select Top 10000 a. Name as table name ,Max(b. Rows) as record number from sysobjects a ,sysind

I. Problems The table is as follows: Obtain the following results: Ii. solution 1 Use XML Conversion The Code is as follows: Create Table body (ID int, body nvarchar (20) goinsert into body values (1, 'aaa') insert into body values (2, 'bbbbb ') insert into body values (1, 'cccccccc') insert into body values (3, 'ddddd ') goselect * From bodyselect distinct. ID, stuff (select ',' + body from body where id =. ID for XML Path (''),'') as bodyfrombody a -- the specific idea is as follows: Select

Label:An error occurred when the INSTEAD of Update View Trigger association table update originated in the system is as follows: MSG 414, Level 16, State 1, line 1thUpdate is not allowed because the statement updates the view "Vtesttab" and the view participates in the join and has a INSTEAD of UPDATE trigger. So test how the trigger is executed! ~ Description

select|server| variable | statement declare @user nvarchar (20) Select @user = ' User1 ' Use CountMe /* To determine whether the user exists * * DECLARE @userweek int Select @userweek =[week] from base where userid= @user SELECT @ @rowcount If @ @rowcount =0 Return Select @userweek The result of the final @userweek print is to record the value of the week field with the user name User1. And when we select all the

During this time, the project needs to import the original data to the new database, and the duplicate data needs to be deleted. I use the cursor method to solve this problem. The SQL statement is as follows to avoid forgetting. Code Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> -- Delete duplicate data. Only the records with the largest number ar

Exception in thread "Main" com. microsoft. sqlserver. JDBC. sqlserverexception: The TCP/IP connection to the host xx.111.134.54, port 1433 has failed. error: Connection timed out: connect. please verify the Connection Properties and check that a SQL server instanceIs running on the host and accepting TCP/IP connections at the port, and that no firewall is blocking TCP connections to the port.At com. Microso

SQL Server INSTEAD OF UPDATE view trigger problem, sqlserverinstead An error occurs when the system's instead of update view trigger is associated with table UPDATE: Message 414, level 16, state 1, 1st rowsUPDATE is not allowed, because this statement updates the view "VTest

SQL Server 2008 provides an enhanced SQL command merge for use in the msdn:http://msdn.microsoft.com/zh-cn/library/bb510625.aspx Function: Inserts, updates, or deletes on the target table based on the results of joining with the source table. For example, you can synchronize two tables by inserting, updating, or deleting rows in a table based on differences foun

Recently looked for a lot of replacement to be inserted in the Trojan record, found a good statement, very useful, just use more than 10 lines of travel slogan, the entire database of all the table malicious Trojan cleared away, and in Google search to this record chance is very small, this special reprint! In order to find their own later, but also hope that future generations can be helped. The original text reads as follows: Copy Code code as follows: DECLARE @t varchar (555),

SQL Server displays the latest update data for each category and SQL updates This example describes how SQL Server displays the latest data updates for each category. We will share this with you for your reference. The details are

SQL Server triggers enable simultaneous addition, deletion, and update of multiple tables Definition: What is a trigger? In SQL Server is a certain operation of a table, triggering certain conditions, thus executing a program. A trigger is a special stored procedure.There a

=n ' Ms_description ', @value =n ' table notes ', @level0typE=n ' SCHEMA ', @level0name =n ' dbo ', @level1type =n ' table ', @level1name =n ' name ' EXEC sp_updateextendedproperty @name =n ' Ms_ Description ', @value =n ' table Notes ', @level0type =n ' SCHEMA ', @level0name =n ' dbo ', @level1type =n ' table ', @level1name =n ' name '/*** Query comment Related sql***********************/--view table Comments SELECT A.name, c.value from Sys.tables A

SQL Server UPDATE statement Usage Details, sqlupdate The SQL Server UPDATE statement is used to UPDATE data. The following describes the SQL