Jan 5, 2017 · 31 One of the scenarios I found useful to use CTE is when you want to get DISTINCT rows of data based on one or more columns but return all columns in the table.

Mar 7, 2025 · I'm trying to use a CTE at the top of my query to be referenced in WHERE clause in a separate CTE further down. For Example: with ref as ( null email, ' ("720884","70540"...

Jun 23, 2012 · In this excellent SO question, differences between CTE and sub-queries were discussed. I would like to specifically ask: In what circumstance is each of the following more efficient/faster? …

I never use CTE with recursion. I was just reading an article on it. This article shows employee info with the help of Sql server CTE and recursion. It is basically showing employees and their mana...

Problem Reason: Here, you don't have to use multiple WITH clause for combine Multiple CTE. Solution: It is possible to create the Multiple Common Table Expression's using single WITH clause in SQL.

Mar 27, 2009 · SQL Server query engine parse the CTE code as part of the query text and build an execution plan according. The idea that CTE is inline is the big advantage of using CTE, since it …

Sep 10, 2008 · A CTE is not much more than syntactic sugar. It enhances the readability and allows to avoid repetition. Just think of it as a placeholder for the actual statement specified in the WITH() …

IMO, anyone who thinks a CTE is less readable that a gigantic blob of interwoven subqueries hasn't seen the garbage pile of confusing saw-teeth-shaped queries in use across the majority of enterprise …

Example C, "Using multiple CTE definitions in a single query," calls this out explicitly. Sadly, this example is not provided in the documentation for SQL 2008 and older (i.e., the example wasn't …

The CTE can be used in a from clause at any level of nesting within other subqueries. The CTEs -- as with everything in SQL -- need to be defined before they are used.