Scenario-28 | SQL CTE(Common Table Expression) | Multiple CTE | SQL WITH Clause

Publicado em: 27 Abril 2022
no canal de: Valuetech Academy

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SQL CTE(Common Table Expression) | Multiple CTE | SQL WITH Clause

In this video, we will learn how to write queries using SQL WITH Clause.
The WITH Clause specifies a temporary named result set, known as a common table expression (CTE). A common table expression(commonly referred as CTE) can include references to itself. This is referred to as a recursive common table expression(Recursive CTE) that uses WITH Clause. We will also see the guidelines apply to using a recursive common table expression(CTE) with the help of scenarios.

The WITH Clause using the Common Table Expression (CTE) must be followed by a single SELECT, INSERT, UPDATE, or DELETE statement that references some or all the Common Table Expression (CTE) columns within the SQL WITH Clause.

How SQL WITH Clause works?
WITH clause allows us to give a subquery block a name that can be used in multiple places within the main SELECT, INSERT, DELETE or UPDATE SQL query in the Common Table Expression (CTE).
In order to demonstrate and explain the WITH clause in SQL effectively we will be using 2 scenarios in this video.

In this video, we will learn to use SQL WITH Clause with 2 scenarios.
In the first scenario, we will use SQL WITH Clause in a single CTE(Common Table Expression).
In the second secanrio, we will see how to use SQL WITH Clause in a Multiple CTE(Common Table Expression).

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