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Example 1 – Simple WITH Clause This example shows a basic WITH clause (also known as subquery factoring or Common Table Expression). It shows each employee and the number of employees in the office. WITHo_countAS(SELECToffice_id,COUNT(*)ASoffice_countFROMemployeeGROUPBYoffice_id)SELECTe.emp_...
If you now compare the estimated operator, I/O, and CPU costs with the costs for the same query without WHERE, you can notice that the values when the WHERE clause is used are smaller by two orders of magnitude SELECT with WHERE on a nonclustered index A similar example is to use the...
SQL Server 2005 Recursion(递归) and WITH Clause 代码 1/* 2from: http://www.eggheadcafe.com/articles/sql_server_recursion_with_clause.asp 3http://msdn.microsoft.com/en-us/library/ms186243.aspx 4http://msdn.microsoft.com/en-us/library/aa175801%28SQL.80%29.aspx 5SQL Server 2005 Recursio...
The GROUP BY clause in SQL Server allows grouping of rows of a query. Generally, GROUP BY is used with an aggregate SQL Server function, such as SUM, AVG, etc. In addition, the GROUP BY can also be used with optional components such as Cube, Rollup and Grouping Sets. In thi...
DELETE statement) when accessing tables with a large number of records. They’re extremely useful if you have hundreds of thousands or millions of records in a database and want to access the data quickly with aWHERE clause. Indexwas are beneficial for smaller tables as well. In addition, ...
Example 1: SQL GROUP BY with WHERE or HAVING Clauses If you’re confused about when to use WHERE and HAVING, this one is for you. Because depending on the condition you provide, both may give the same result. But they’re different. ...
Defining a clustered index as unique can gain performance improvements when the indexed column(s) is used after the WHERE clause SQL Server Clustered Index and Range Scan When we explain the structure of the clustered index, we mentioned an interconnection between the index pages and its backward...
This method is the best way to sort data rows of an SQL View object using Order By clause on an SQL Server database But as I had also required some SQL views to be sorted by default. In such cases, as the error message "Msg 1033" indicates, ORDER BY clause can only be used in ...
The above image is an example of a typical SQL query comprised of different clauses, expressions, predicates, and statement. SQL is a 4thgeneration programming language which is multi-paradigm in nature. It is a declarative language and also contains procedural elements. It was initially released...