in 和 exists的区别: 如果子查询得出的结果集记录较少,主查询中的表较大且又有索引时应该用in, 反之如果外层的主查询记录较少,子查询中的表大,又有索引时使用exists。其实我们区分in和exists主要是造成了驱动顺序的改变(这是性能变化的关键),如果是exists,那么以外层表为驱动表,先被访问,如果是IN,那么先执行子...
Let’s select some distinct values from our employee table. If we have a glance at the gender column, we can see that two values are being repeated, male and female. select distinct e_gender from employee; After writing the query, click on the execute button to check for errors ...
1. Determine what version of SQL Server you have and double-click the link below to download the zip file of SQL templates. In the zip file, click on the TRACETMPL folder and double-click on the .tdf file for your version and SQL Profiler will aut...
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How to use if else condition in case statement using sql server 2008? how to use IF statement in subquery how to use IF-THEN-ELSE in a inline table-valued function how to use iif in sql server 2008? How to use like operator in dynamic query? How to use LIKE operator with Varible in...
Note If you are using SQL Server 2005, you must specify a value that is not empty for the Product name property in SQL Server Management Studio or for the @srvproduct property in the stored procedure for an Excel data source. Using SQL Server Management Studio or Enterprise Manager to confi...
Introduction In this article we will discuss about how to avoid ELSE-IF Statement in stored procedure in SQL Server. As we all know that stored procedure is faster than LINQ, so we will fetch data from database using stored procedure. Background Here we have to use condition with where ...
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However, if you need to transform the schema as the data is moved such that the schema on the Subscriber is not a subset of the schema on the Publisher, SQL Server 2019 Integration Services (SSIS) is the recommended solution. For more information, see SQL Server Integration Services. If ...
The sample packages assume that the data files are located in the folderC:\Program Files\Microsoft SQL Server\100\Samples\Integration Services\Tutorial\Creating a Simple ETL Package. If you unzip the download to another location, you might have to update the file path in multiple places in the...