Which statement about COUNT is correct?

Problem Statement

Explanation

COUNT(column) counts only non-NULL entries in that column. COUNT(*) includes every row regardless of NULLs. When you need unique non-NULLs, use COUNT(DISTINCT col).

Code Solution

SolutionRead Only

SELECT COUNT(*) all_rows, COUNT(email) emails
FROM users;

Practice Sets

This question appears in the following practice sets:

Filtering, Grouping & Aggregations

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Which statement about COUNT is correct?

Problem Statement

Explanation

Code Solution

Practice Sets

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Master Interviews Anywhere, Anytime

Which statement about COUNT is correct?

Problem Statement

Explanation

Code Solution

Practice Sets

Related Questions

Which SQL statement retrieves all columns and rows from a table named employees?

Which clause filters rows before aggregation and affects which rows are grouped?

What is the default sort order when ORDER BY is used without ASC or DESC?

Which construct is commonly used to paginate results in SQL engines like Postgres and MySQL?

Which predicate correctly checks for missing values in standard SQL?

More from SQL & Databases

Master Interviews
Anywhere, Anytime