How do I add a decimal field in a Codeigniter Migration File?

codeigniter migration

'price' => array(    'type' => 'DECIMAL',    'constraint' => '10,2',),

codeigniter migration

'price' => array('type' => 'DECIMAL','constraint' => '10,2','null' => FALSE,'default' => 0.00),

codeigniter migration

'price' => array('type' => 'DECIMAL(10,2)')

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