Unpivot Columns to Rows in SQL Server (SQL Detailed Walkthrough)

In this video you will learn how to unpivot data using SQL Server via a highly detailed example. We will use Tableau Superstore data to build an aggregation table using a CTE (Common Table Expression).
Aggregation tables are useful to data visualization developers as table information is stored with pre-summarized totals at a higher level of aggregation than the most granular fact table. They allow reports to be generated from small, rather than large, tables. The UNPIVOT relational operator enables this benefit!
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00 Intro
0:30 Wide Data vs Tall Data
1:45 Explore Dataset (Superstore)
2:20 Build Aggregation Table
3:22 Leave a Comment for More Explanation
5:03 Learn to Comment Multiple Lines w/ a Shortcut
6:12 Build a CTE
7:27 UNPIVOT (finally)
9:41 Column Consistency
9:48 I'm Real
10:39 Resolve Column Type Conflicts
#sqlserver #analytics #data #dataanalyst #education #onlinelearning

[@florincopaci6821]

Hello can you please explain what s the trick here? In the datediff substracting 0 from orderdate? thank you