Question

in the below table i would want the property_id to be unique so that it doesn’t have duplicate values. what is the syntax for this?

CREATE TABLE IF NOT EXISTS `propFeatures` (
`id` bigint(20) NOT NULL auto_increment,
`bedroom` int(10) NOT NULL,
`bathroom` int(10) NOT NULL,
`balcony` int(10) NOT NULL,
`furnished` tinyint(1) NOT NULL,
`property_id` int(10) NOT NULL,
PRIMARY KEY  (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8; 

Answer 1

You can add UNIQUE constraint to your property_id column so that it does not allow duplicates if you want.

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To check duplicates, you can run this query:

select property_id, count(property_id) as total from propFeatures
       group by property_id having count(property_id) > 1

If you want to remove duplicates, check out this post for more info:

MySQL: Remove Duplicate Rows/Records from Table