Node.js MySQL AVG() Function
Last Updated :
07 Oct, 2021
We use AVG Function to get the average value of all rows in the given column of MySQL Table.
Syntax:
AVG([column_name])
Parameters: AVG() function accepts a single parameter as mentioned above and described below.
- column_name: Column’s name from which we have to return the average value.
Module Installation: Install the mysql module using the following command.
npm install mysql
Database: Our SQL publishers table preview with sample data is shown below:
Example 1:
index.js
const mysql = require( "mysql" );
let db_con = mysql.createConnection({
host: "localhost" ,
user: "root" ,
password: '' ,
database: 'gfg_db'
});
db_con.on( 'error' , (err) => {
console.log(err.code);
});
db_con.connect((err) => {
if (err) {
console.log( "Database Connection Failed !!!" , err.code);
return ;
}
console.log( "We are connected to gfg_db database" );
let query = "SELECT AVG(salary) AS avg_salary FROM publishers" ;
db_con.query(query, (err, rows) => {
if (err) throw err;
console.log(rows);
});
});
|
Run the index.js file using the following command.
node index.js
Output:
Example 2:
index.js
const mysql = require( "mysql" );
let db_con = mysql.createConnection({
host: "localhost" ,
user: "root" ,
password: '' ,
database: 'gfg_db'
});
db_con.on( 'error' , (err) => {
console.log(err.code);
});
db_con.connect((err) => {
if (err) {
console.log( "Database Connection Failed !!!" , err.code);
return ;
}
console.log( "We are connected to gfg_db database" );
let query = "SELECT AVG(salary) AS avg_salary
FROM publishers WHERE id < 8" ;
db_con.query(query, (err, rows) => {
if (err) throw err;
console.log(rows);
});
});
|
Run the index.js file using the following command.
node index.js
Output:
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