[Solved] In an ER diagram, what does a weak entity typically become when converting to tables? — Ans: A table with a composite primary key including the owner entity's key | SQL

SQL - Table Relationships

In an ER diagram, what does a weak entity typically become when converting to tables?

AMerged into the owner entity's table

BA table with a composite primary key including the owner entity's key

CA table with no primary key

DA table with only its own attributes as primary key

Step-by-Step Solution

Solution:

Step 1: Understand weak entity characteristics
A weak entity depends on an owner entity and does not have a full primary key by itself.
Step 2: Map weak entity to table with composite key
When converting, the weak entity's table includes its own partial key plus the owner's primary key to form a composite primary key.
Final Answer:
A table with a composite primary key including the owner entity's key -> Option B
Quick Check:
Weak entity mapping = composite key [OK]

Quick Trick: Weak entities need owner keys in their primary key [OK]

Common Mistakes:

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In an ER diagram, what does a weak entity typically become when converting to tables?