sql server merge databases

1. OverviewADO provides a wealth of database operations that can be divided into three steps:First, connect the database with the SqlConnection object;Second, establish the SqlCommand object, which is responsible for the execution of SQL statements and the invocation of stored procedures;Third, operate on the results returned after SQL or stored procedure execution.There are two types of operations that ret

can be used for development and testing. Application upgrade: Copy the application database to a new database before major application updates. If a mistake is made during the upgrade, recover the earlier database state by renaming the new database to the application database name. Application migration: The database copy feature creates a transactionally consistent copy of the database; you can then perform a data-tier Application (DAC) export to create an export file that has both the de

Introduction The merge keyword is a magic DML keyword. It is introduced in SQL Server 2008. It can combine insert, update, and delete into a simple sentence. Msdn's explanation of merge is very short and concise: "the target table is inserted, updated, or deleted based on the result of the connection to the source tabl

Introduction The merge keyword is a magic DML keyword. It is introduced in SQL Server 2008. It can combine insert, update, and delete into a simple sentence. Msdn's explanation of merge is very short and concise: "the target table is inserted, updated, or deleted based on the result of the connection to the source tabl

Today I'll cover the three types of connection operators in SQL Server: Loop nesting, hash matching, and merge joins. This paper mainly introduces the different and complexity of the three kinds of connections in the form of examples.The sample database AdventureWorks is used in this article, as follows: http://msftdbprodsamples.codeplex.com/releases/view/4004Int

Label:Written in front of the words: Before the merge statement, feel no use, can be used in other ways to replace, recently looked at the merge statement, it is very useful, can write a lot less code, it looks very compact, of course, there are other advantages.= = = Text starts =====SQL Server 2008 introduces the

The merge keyword is a magical DML keyword. It was introduced in SQL Server 2008, it can be insert,update,delete simple and as a sentence. MSDN's interpretation of the merge is very short: "Insert, update, or delete operations on the target table based on the results of the join with the source table." For example, you

SQL commands for regularly deleting historical data from databases and SQL commands for historical data Create a job,Used to regularly clear historical database data Delete the data of the first quarter of the table before gps_comm, as follows: Elete from gps_comm WHERE (date If you want to continue to delete the data from the first 120 days in another table, y

These two tools are suitable for most databases.( oci.dll and local client inconsistencies for Oracle databases 32 and 64 need to be consistentOra-28547:connection to server failed,probable Oracle Net admin Errorin the Oracle installation directory (such as D:\app\Administrator\product\11.2.0\client_1\BIN), locate the Oci.dll replacement to the Navicat installat

fact there is only one member table and one distributed partitioned view per server. The location of the data is transparent to the application. One, rebuilding the indexDBCCREINDEX,DBCCIndexdefrag, shrinking data and logsDBCCSHRINKDB,DBCCshrinkfile. Set up automatic shrink logging. For large databases do not set up automatic database growth, it can degrade server