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Microsoft Azure SQL Data Warehouse - Architecture and SQL by Todd Wilson, Tom Coffing

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Chapter 13 – Sub-query Functions

“An invasion of Armies can be resisted, but not an idea whose time has come.”

- Victor Hugo

An IN List is much like a Subquery

image

SELECT *

FROMEmployee_Table

WHERE  Dept_No IN (100, 200) ;

image

This query is very simple and easy to understand. It uses an IN List to find all Employees who are in Dept_No 100 or Dept_No 200.

An IN List Never has Duplicates – Just like a Subquery

image

What is going on with this IN List? Why in ...

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