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NodeJS MySQL NULL Values
  • Last Updated : 18 Feb, 2021

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:


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