[Solved] In PostgreSQL, what is the effect of using the ALL operator with a comparison and a subquery? — Ans: It returns true if the comparison holds for every value returned by the... | PostgreSQL

PostgreSQL - Subqueries in PostgreSQL

In PostgreSQL, what is the effect of using the ALL operator with a comparison and a subquery?

AIt returns true if the comparison holds for no values returned by the subquery.

BIt returns true if the comparison holds for at least one value returned by the subquery.

CIt returns true if the comparison holds for every value returned by the subquery.

DIt returns true if the comparison holds for exactly half of the values returned by the subquery.

Step-by-Step Solution

Solution:

Step 1: Understand the ALL operator
The ALL operator compares a value to every value returned by a subquery.
Step 2: Evaluate the comparison
The condition is true only if the comparison is true for every single value from the subquery.
Final Answer:
It returns true if the comparison holds for every value returned by the subquery. -> Option C
Quick Check:
Check if all values satisfy the condition [OK]

Quick Trick: ALL means every value must satisfy the condition [OK]

Common Mistakes:

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In PostgreSQL, what is the effect of using the ALL operator with a comparison and a subquery?