how to get knex instance code example

Example 1: knex migration

// best tutorial knex migration
https://www.youtube.com/watch?v=ipAH7lMfq7k
https://www.youtube.com/watch?v=U7GjS3FuSkA

Example 2: is knex built into node js

$ npm install knex --save

# Then add one of the following (adding a --save) flag:
$ npm install pg
$ npm install sqlite3
$ npm install mysql
$ npm install mysql2
$ npm install oracledb
$ npm install mssql