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# ->selectAdd()

->selectAdd() -- Add selected columns

## Synopsis

``void $DB_DataObject->selectAdd` ([string $condition])`

## Description

Adds a selected columns. By default a select query will request all items (eg. SELECT * FROM table), to change this behavior you can first call selectAdd() without any arguments to clear the current request and then add the specific items you require.

You can also set up a default selection query by adding SelectAdd() method calls in the object constructor method (the one with the same name as the class)

## Parameter

- `resource $key` - table column name

## Note

This function can not be called statically.

## Example

Example 33-1. Using selectAdd()
    $person = new DataObjects_Person;
    $person->selectAdd();
    $person->selectAdd('id,name');

    while ($person->fetch()) {
      echo "$person->id} {$person->name}<BR>";
    }

    $person = new DataObjects_Person;
    $person->selectAdd("DATE_FORMAT(birthday,'%d %m %Y') as birthday_formated ");
    $person->id = 12;
    $person->find(TRUE);

    echo "$person->name} {$person->birthday_formated}<BR>";

Example 33-2. Resulting SQL
    SELECT id,name FROM person

    SELECT *, DATE_FORMAT(birthday,'%d %m %Y') as birthday_formated  FROM person WHERE id=12

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