In SQL, what result does the expression SUM(amount) OVER () produce when used in a SELECT statement?

easy📝 Conceptual Q1 of 15

SQL - Advanced Window Functions

In SQL, what result does the expression SUM(amount) OVER () produce when used in a SELECT statement?

AThe sum of <code>amount</code> for each distinct group defined by a partition

BThe total sum of the <code>amount</code> column across all rows

CThe cumulative sum of <code>amount</code> ordered by a column

DThe average of the <code>amount</code> column over all rows

Step-by-Step Solution

Solution:

Step 1: Understand the window function syntax
SUM(amount) OVER () means sum over all rows without partitioning or ordering.
Step 2: Effect of empty OVER clause
Empty parentheses indicate the window includes all rows in the result set.
Final Answer:
The total sum of the amount column across all rows -> Option B
Quick Check:
SUM with empty OVER returns total sum [OK]

Quick Trick: Empty OVER() sums entire column [OK]

Common Mistakes:

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