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Nested CTE – A Simple Sample

Antonios Chatzipavlis
Friday 01 March 2013

Σε αυτό το σύντομο post θα σας δείξω κάτι για το οποίο έχω ερωτηθεί αρκετές φορές και δεν είναι άλλο από το πώς μπορώ να έχω nested CTE statements.

Αρκετοί πιστεύουν ότι αυτό μπορεί να γίνει βάζοντας το ένα μέσα στο άλλο, όμως κάτι τέτοιο συντακτικά δεν είναι επιτρεπτό.

Γι’ αυτό το λόγο σας παραθέτω ένα απλό παράδειγμα το οποίο είναι εύκολα κατανοητό

WITH T1
AS
(
      SELECT * FROM (VALUES (1),(2),(3),(4),(5)) AS T(A)
) ,
T2
AS
(
      SELECT *, 'T2' AS B FROM T1
) ,
T3
AS
(
      SELECT *,'T3' AS C FROM T2
)
SELECT * FROM T3

Antonios Chatzipavlis

Antonios Chatzipavlis

Antonios Chatzipavlis is a highly experienced Data Solutions Consultant and Trainer. He has been working in the IT industry since 1988, holding various roles such as senior developer, IT Manager, Data & AI Solutions Architect and Consultant.

Since 1995, Antonios has focused on modern technologies and software development tools, primarily by Microsoft. He has specialized in Data & AI since 2000, with expertise in Microsoft Data Platform (SQL Server, Azure SQL Databases, Azure Synapse Analytics, Microsoft Fabric, Power BI, AI) and Databricks.

Antonios is also a Microsoft Certified Trainer (MCT) for over 25 years, has been recognized as a Microsoft Most Valuable Professional (MVP) in Data Platform since 2010 and he is in the Data Expert 40 Powerlist 2024 by Boussias. He is the co-founder and visionary behind XLYTiCA, a company dedicated to Data & AI solutions.

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