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SQL COUNT rows, duplicates, entries table


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SQL Tutorial » SQL add columns to a table - SQL ALTER

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:

SELECT COUNT(column_name) FROM table_name WHERE condition;

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

ID First Name Last Name Country Email
1 Clark Kent USA clarkkent@mail.com
2 Pire Joveau France pierej@mail.com
3 Nicky Anderson USA nickya@mail.com
4 Pepe Martínez Spain martinezpeper@mail.com
5 Peter Parker SUA peterparker@mail.com

 

SQL COUNT entries table - rows in table

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

SELECT COUNT(id)
FROM Users;

Output displayed: 5

Related subjects:
SQL order by SQL where clause PHP select / view data Conect to MySQLi SQL insert into table

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
What does count (*) do in SQL?
How do I count items in SQL?
Can you count in SQL?
How do I count rows in a table in SQL?
How to count the number of rows in a table in SQL Server

 

SQL COUNT rows satisfying specific criteria

Example count with condition: SQL COUNT() function number of rows in a table satisfying specific criteria with WHERE clause.

SELECT COUNT(id)
FROM Users
WHERE Country='USA';

Output displayed: 3

SQL count duplicates

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

SELECT first_name, last_name, COUNT(*)
FROM Users
GROUP BY first_name, last_name
HAVING COUNT(*) > 1

 



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
What does count (*) do in SQL?
How do I count items in SQL?
Can you count in SQL?
How do I count rows in a table in SQL?

SQL COUNT rows, duplicates, entries table - sql tutorial

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