Get Auto Increment Field from a table using Magento 2.

You can get the Auto Increment Field from a database table using Magento 2 as Best coding practice way.

You need to use getAutoIncrementField() for getting the auto-increment field from the table.

Output: Returns field name if an auto-increment field is available otherwise return as false.

You can call $this->getAutoIncremntFieldName() function to check sales_order table with auto_increment field name.

Output:
entity_id