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NodeJS MySQL AVG() Function
  • Last Updated : 17 Feb, 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");
  
    // Here is the query
    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");
  
    // Here is the query
    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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