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What does the COUNT() Function count?

Question

What does the COUNT() Function count?

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Solution

The COUNT() function in SQL is used to count the number of rows that match a specified criterion. It can be used in three ways:

  1. COUNT(*) - This counts the total number of rows in a table, including the rows containing NULL values.
  2. COUNT(column_name) - This counts the number of rows in a specific column, excluding the rows containing NULL values.
  3. COUNT(DISTINCT column_name) - This counts the number of distinct values in a specified column, excluding the rows containing NULL values.

So, in summary, the COUNT() function counts the number of rows based on the criteria you specify.

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