Unsigned Integer

For foreign key migrations instead of integer() use unsignedInteger() type or integer()->unsigned(), otherwise you may get SQL errors.

1Schema::create('employees', function (Blueprint $table) {
2    $table->unsignedInteger('company_id');
3    $table->foreign('company_id')->references('id')->on('companies');
4    // ...
5});

You can also use unsignedBigInteger() if that other column is bigInteger() type.

1Schema::create('employees', function (Blueprint $table) {
2    $table->unsignedBigInteger('company_id');
3});