[Solved] Which of the following is a valid reason to use a domain type instead of a plain data type? — Ans: To enforce consistent data validation across multiple tables | PostgreSQL

PostgreSQL - Advanced Features

Which of the following is a valid reason to use a domain type instead of a plain data type?

ATo automatically index a column

BTo speed up data retrieval from the database

CTo create a new table with custom columns

DTo enforce consistent data validation across multiple tables

Step-by-Step Solution

Solution:

Step 1: Identify the benefit of domain types
Domain types help enforce consistent validation rules wherever the domain is used, ensuring data integrity.
Step 2: Eliminate unrelated options
Speeding retrieval, creating tables, or indexing are unrelated to domain types' purpose.
Final Answer:
To enforce consistent data validation across multiple tables -> Option D
Quick Check:
Domain use case = Consistent validation [OK]

Quick Trick: Use domains to reuse validation rules easily [OK]

Common Mistakes:

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Which of the following is a valid reason to use a domain type instead of a plain data type?