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Question 109 - DP-203 discussion

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You need to implement a Type 3 slowly changing dimension (SCD) for product category data in an Azure Synapse Analytics dedicated SQL pool.

You have a table that was created by using the following Transact-SQL statement. Which two columns should you add to the table? Each correct answer presents part of the solution.

NOTE: Each correct selection is worth one point.

A.
[EffectiveStartDate] [datetime] NOT NULL,
Answers
A.
[EffectiveStartDate] [datetime] NOT NULL,
B.
[CurrentProductCategory] [nvarchar] (100) NOT NULL,
Answers
B.
[CurrentProductCategory] [nvarchar] (100) NOT NULL,
C.
[EffectiveEndDate] [datetime] NULL,
Answers
C.
[EffectiveEndDate] [datetime] NULL,
D.
[ProductCategory] [nvarchar] (100) NOT NULL,
Answers
D.
[ProductCategory] [nvarchar] (100) NOT NULL,
E.
[OriginalProductCategory] [nvarchar] (100) NOT NULL,
Answers
E.
[OriginalProductCategory] [nvarchar] (100) NOT NULL,
Suggested answer: B, E

Explanation:

A Type 3 SCD supports storing two versions of a dimension member as separate columns. The table includes a column for the current value of a member plus either the original or previous value of the member. So Type 3 uses additional columns to track one key instance of history, rather than storing additional rows to track each change like in a Type 2 SCD.

This type of tracking may be used for one or two columns in a dimension table. It is not common to use it for many members of the same table. It is often used in combination with Type 1 or Type 2 members.

Reference:

https://k21academy.com/microsoft-azure/azure-data-engineer-dp203-q-a-day-2-live-session-review/

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asked 02/10/2024
nosh shah
43 questions
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