1650 or 247 are in common table or not
Answers
Answer:
Step-by-step explanation:
The only honest answer I can give is that you have a tool box full of techniques, and you must use the right tool for the job at hand. I dread hearing the words “We saw a presentation on [fill in the blank] and are now changing all our queries to use it.” Sometimes you can start with your favorite method. But that favorite method may not work or might perform poorly, and then you should look at other methods.
One of my favorite techniques for complex queries is to use a common table expression (CTE). (I often start with a CTE, but will change direction as needed). CTEs were introduced back in SQL Server 2005. While there is some additional functionality, i.e. recursion, CTEs work similarly to derived tables. Derived tables are subqueries that are used in the FROM clause instead of named tables. I like using CTEs over derived tables because CTEs are so much easier to read. Derived tables can be nested and often are several layers deep, becoming difficult to read and understand.
Following is an example using the AdventureWorks2014 database showing the difference between using a CTE and a derived table to accomplish the same thing. First is the derived table version of the query, followed by the CTE version. Focus on the FROM clause, and you see how much more comprehensible that clause and the main query become as a result of writing the subquery as a CTE.
no it is a hard table for us
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