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Iam unable to understand following:

$this->db->select('1', FALSE)开发者_如何学编程;

Can some one elaborate it in simple way.

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The first parameter is the field names or values in your case 1 from your table, the second parameter FALSE prevents the first parameter being wrapped in backticks. You'd use this is you were nesting a sub query as the first parameter.

For further information see the Codigniter docs which are incredibly useful.