javascript - What is the difference between createTable(...).createTable(...) and createTable(...).then(...) in knex.js? -

i using knex.js connect mysql database. want create couple of tables. far, have seen 2 styles. 1 of them chains use of createtablelike so,

    knex.schema.createtable('foo',function(table){...}).createtable('bar'...)

the other style uses then mechanism same thing.

    knex.schema.createtable('foo',function(table){...}).then(function() {         knex.schema.createtable.createtable('bar'...)

are semantically similar? can assume same thing? both of them execute second clause once first clause finishes?

i think comment should enough answer,

then

in javascript returns promise executed asynchronously, while other method executed synchronously , javascript won't next line until line executed.

UV code