O Guia Definitivo do Yii 1.1

SELECT DISTINCT `id`, `username`
from
function from($tables)
The from method specifies the FROM part of a query. The $tables parameter specifies
which tables to be selected from. This can be either a string representing commaseparated
table names, or an array of table names. Table names can contain schema
prefixes (e.g. public.tbl_user) and/or table aliases (e.g. tbl_user u). The method will
automatically quote the table names unless it contains some parenthesis (which means
the table is given as a sub-query or DB expression).
Below are some examples:
// FROM `tbl_user`
from('tbl_user')
// FROM `tbl_user` `u`, `public`.`tbl_profile` `p`
from('tbl_user u, public.tbl_profile p')
// FROM `tbl_user`, `tbl_profile`
from(array('tbl_user', 'tbl_profile'))
// FROM `tbl_user`, (select * from tbl_profile) p
from(array('tbl_user', '(select * from tbl_profile) p'))
where
function where($conditions, $params=array())
The where method specifies the WHERE part of a query. The $conditions parameter
specifies query conditions while $params specifies the parameters to be bound to the
whole query. The $conditions parameter can be either a string (e.g. id=1) or an array of the
format:
array(operator, operand1, operand2, ...)
where operator can be any of the following:
• and: the operands should be concatenated together using AND. For example, array
('and', 'id=1', 'id=2') will generate id=1 AND id=2. If an operand is an array, it will be
converted into a string using the same rules described here. For example, array('and',
'type=1', array('or', 'id=1', 'id=2')) will generate type=1 AND (id=1 OR id=2). The
method will NOT do any quoting or escaping.
• or: similar as the and operator except that the operands are concatenated using OR.
• in: operand 1 should be a column or DB expression, and operand 2 be an array
representing the range of the values that the column or DB expression should be in.