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⟩ How to write a program that performs the calculations using the SQL function?

- The SQL functions are used to perform the calculations of the statements using the Zend_Db_Select command.

- The expression needs to have parentheses and the command that is given as Zend_Db_Select need to provide the statement appropriately.

- The Zend_Db_Expr is used to explicitly create the expressions that are given below:

$select = $db->select()

->from(array('p' => 'products'),

array(

'product_id',

'cost_plus_tax' => new Zend_Db_Expr('p.cost * 1.08'),

));

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