SQL COUNT rows, duplicates, entries table

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How do I count rows, items in a table in SQL? using SQL COUNT() statement.
The SQL COUNT() function is used to count the items, number of rows, duplicates ...., that matches a specified criterionW.

Syntax:

Let's look at the "Users" table: We will have five columns as: "id", "first_name", "last_name", "country" and "email":

Let's count the entire database (all rows in table) from "Users"

Output displayed: 5

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Tags: sql count: group by, distinct, where, rows, if, rows in table, duplicates, select, entries in table, where value equals (distinct, with condition, rows, distinct group by, multiple columns, if
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Example count with condition: SQL COUNT() function number of rows in a table satisfying specific criteria with WHERE clause.

Output displayed: 3

Let's find out: How do I count duplicates in SQL?, How does SQL count matching values?
As example let s find the duplication of first_name and last_name from a database