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Which of the following is the correct syntax to count all rows in a table named users?

easy📝 Syntax Q3 of 15
SQL - Aggregate Functions
Which of the following is the correct syntax to count all rows in a table named users?
ASELECT COUNT(users.*) FROM users;
BSELECT COUNT(users) FROM *;
CSELECT COUNT() FROM users;
DSELECT COUNT(*) FROM users;
Step-by-Step Solution
Solution:

  1. Step 1: Review correct COUNT syntax

    The correct syntax to count all rows is SELECT COUNT(*) FROM table_name;

  2. Step 2: Check each option

    SELECT COUNT(*) FROM users; matches the correct syntax. Others have syntax errors or invalid expressions.

  3. Final Answer:

    SELECT COUNT(*) FROM users; -> Option D

  4. Quick Check:

    Correct COUNT syntax = SELECT COUNT(*) FROM users; [OK]
Quick Trick: Use COUNT(*) to count all rows correctly [OK]
Common Mistakes:
MISTAKES
  • Using COUNT() without arguments
  • Using COUNT(table_name) incorrectly
  • Using invalid syntax like COUNT(users.*)

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