mysql - Help writing where portion of query in codeigniter -

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i have query written using codeigniters active record class.

when query written looks like

where `account` = 1  , cgl.contactid null  , `firstname` 'm%'  or `lastname` 'm%'

but need like

where `account` = 1  , cgl.contactid null  , (`firstname` 'm%'  or `lastname` 'm%') //notice brackets

how can this?

$this->where(array('account' => 1, 'cgl.contactid' => null); $this->where(("firstname` 'm%' or `lastname` 'm%'"))

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