Node.js MySQL NULL Values

In this article, will learn to handle NULL values and make Query on the basis of NULL values.

Syntax:

IS NULL;

IS NOT NULL;

Return Value:

• ‘IS NULL’ returns the row in the column which contains one or more NULL values.
• ‘IS NOT NULL’ returns the row in the column which does not contains any NULL values.

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.connect((err) => {
    if (err) {
      console.log("Database Connection Failed !!!", err);
      return;
    }

    console.log("We are connected to gfg_db database");

    // Here is the query
    let query = "SELECT * FROM users WHERE address IS NULL";

    db_con.query(query, (err, rows) => {
        if(err) throw err;

        console.log(rows);
    });
});

Output:

Example 2:

index.js

const mysql = require("mysql");

let db_con  = mysql.createConnection({
    host: "localhost",
    user: "root",
    password: '',
    database: 'gfg_db'
});

db_con.connect((err) => {
    if (err) {
      console.log("Database Connection Failed !!!", err);
      return;
    }

    console.log("We are connected to gfg_db database");

    // Here is the query
    let query = "SELECT * FROM users WHERE address IS NOT NULL";

    db_con.query(query, (err, rows) => {
        if(err) throw err;

        console.log(rows);
    });
});

Output: