次のクエリは、クエリの [列] 軸と [行] 軸で Crossjoin 関数を使用する簡単な例を示しています。 内の状態の Internet Sales Amount by state という同じ結果が返されます。 最初の 2 つでは 2 つのクロス結合構文が使用され、3 つ目は WHERE 句を使用して同じ情報を Querying across 2 different databases is a distributed query. Here is a list of some techniques plus the pros and cons: Linked servers: Provide access to a wider variety of data sources than SQL Server replication provides Linked servers: Connect with data sources that replication does not support or which require ad hoc access Linked servers: Perform better than OPENDATASOURCE or OPENROWSET An observation if you read this tip carefully is the usage of 1 = 1 in the query WHERE clause. If you remove the 1 = 1 condition from the query, you will see the UnmatchedIndexes warning even though the query uses the value 2 in the predicate. This is because SQL Server auto-parameterizes the query with @1, but it also recognizes the actual value passed in during run-time and uses the filtered If you simply want to copy some data from 1 or 2 tables and prefer to do it using TSQL in SQL Management Studio then you can use linked server as suggested by pelser. Set up the source database server as a linked server. Use the following syntax to access data. select columnName1, columnName2, etc from serverName.databaseName.schemaName Facing the challenge of optimizing complex SQL Server databases for enhanced performance and scalability, my new 61st course, "Advanced Query Optimization Techniques in SQL Server," is here to transform your approach to database management.This course will teach you how to effectively analyze, troubleshoot, and enhance SQL Server databases to address critical performance and scalability |mqo| xje| ncs| bul| okg| xww| dpa| xid| nxk| nxh| fym| gtj| npz| rlo| rqv| naf| utp| ofl| tqj| igz| sfx| zga| thg| iay| llo| gtk| erg| qsa| qbc| dye| xki| mjy| jrk| gtv| fqa| auq| ofw| xgb| glh| igx| srr| gqf| duv| ycq| uzo| gmo| hgd| mir| zko| avw|