Node.js MySQL Delete Query

Last Updated : 07 Oct, 2021

We use SQL DELETE Query to delete data with some condition from MySQL Table.

Syntax:

This will delete all rows of customers’ tables but everything else will remain as it is (indexing, etc).
```
DELETE FROM users
```
This will delete all rows of users table where userId is 2.
```
DELETE FROM users WHERE userId = 2
```

Modules:

mysql: To handle sql connection and queries
```
npm install mysql
```

SQL users table preview:

Example 1: Delete all rows from users table

Javascript

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 our query 
    let query = 'DELETE FROM users'; 
  
    db_con.query(query, (err, rows) => { 
        if(err) throw err; 
  
        console.log('Cleared users Table'); 
    }); 
});

Output:

Example 2: Delete all users whose name = ‘pratik’.

Approach 1: Hard code the value

Javascript

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"); 
  
    // This is our Hard Coded Query 
    let query = "DELETE FROM users WHERE name = 'pratik'"; 
  
    db_con.query(query, (err, rows) => { 
        if(err) throw err; 
  
        console.log('Number of rows deleted = ' + rows.affectedRows); 
    }); 
});

Approach 2: Dynamic Query

Javascript

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"); 
  
    // notice the ? in below query 
    let query = "DELETE FROM users WHERE name = ?"; 
      
    // Dynamic Value 
    let name = 'pratik'; 
  
    // Notice the name variable below 
    // It will replace the ? in query 
    db_con.query(query, name, (err, rows) => { 
        if(err) throw err; 
  
        console.log('Number of rows deleted = ' + rows.affectedRows); 
    }); 
});

Output:

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Article Tags :

Node.js MySQL Delete Query

Javascript

Javascript

Javascript

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