SQL Server: Slowly Changing Dimension Type 2 on historical records

Question

I am trying to set up a SCD of Type 2 for historical records within my Customer table. Attached is how the Customer table is set up alongside the expected outcome. Note that the Customer table in practice has 2 million distinct Customer IDs. I tried to use the query below, but the Start_Date and End_Date are repeating for each row.

 SELECT t.Customer_ID, t.Lifecyle_ID, t.Date As Start_Date,
 LEAD(t.Date) OVER (ORDER BY t.Date) AS End_Date
 FROM Customer AS t

Answer 1

1. It doesn't seem like you're aggregating the original data in any way. You will have the same number of rows in your Type 2 table. Add a DISTINCT or GROUP BY.<\/li>
2. I'd suggest using MAX and MIN, partitioning by customer and lifecycle.<\/li>
3. <\/li><\/ol>

   Hopefully this makes sense.

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