Node.js MySQL NULL Values
Last Updated :
07 Oct, 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" );
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" );
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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