Not able to create MYSQL table due to autoincrement duplicate

Question

Below is my table schema.

CREATE TABLE `tbl_certificate`
(
`certificate_id` int(11) NOT NULL AUTO_INCREMENT,    
`certificate_number` varchar(150) NOT NULL,    
`vin_no_id` varchar(50) NOT NULL,    
`product_id` int(11) NOT NULL,    
`duration_id` int(11) NOT NULL,    
`clientId` varchar(30) NOT NULL,    
`first_name` varchar(50) NOT NULL,    
`last_name` varchar(50) NOT NULL,    
`state` varchar(256) NOT NULL,    
`city` varchar(256) NOT NULL,    
`mobile` varchar(30) NOT NULL,    
`alternate_contact_number` varchar(30) NOT NULL,    
`land_line` varchar(256) NOT NULL,    
`address` varchar(300) NOT NULL,    
`email_id` varchar(50) NOT NULL,    
`registration_no` varchar(20) NOT NULL,    
`make_id` varchar(255) NOT NULL,    
`model_id` varchar(100) NOT NULL,    
`vehical_sale_date` date NOT NULL,    
`vehical_delivery_date` date NOT NULL,    
`engine_number` varchar(30) NOT NULL,    
`fuel` varchar(20) NOT NULL,    
`odometer_reading` varchar(30) NOT NULL,    
`color` varchar(32) NOT NULL,    
`variant` varchar(16) NOT NULL,    
`refered_by` int(11) NOT NULL,    
`user_id` varchar(30) NOT NULL,    
`created_date` date NOT NULL,    
`complete_status` varchar(30) NOT NULL,    
`price_amt` varchar(20) NOT NULL,    
`servicetax_amt` varchar(20) NOT NULL,    
`total_amt` varchar(20) NOT NULL,    
`quotationNumber` bigint(20) NOT NULL,    
`programstart` date NOT NULL,    
`programend` date NOT NULL,    
`uploaded_certificate` int(11) NOT NULL COMMENT '0-No,1-Yes',    
`certificate_create_date` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,    
`savedCertificateDate` datetime NOT NULL,    
`purchaseCertificateDate` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',    
`transaction_no` varchar(256) NOT NULL,    
`expired` int(11) NOT NULL DEFAULT '0'  
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

It throws an error like

Incorrect table definition; there can be only one auto column and it must be defined as a key

I am not getting what's issue, there is only one auto increment field name 'certificate_id'.

Please help.

Answer 1

You need to set "certificate_id" as the Primary Key.

The AUTO_INCREMENT column should also be defined as the primary key. Always stick to the basics of things.