create_table($table[, $if_not_exists = FALSE[, array $attributes = array()]])

backup([$params = array()])

simple_query($sql)

previous_row([$type = 'object'])

field_data()

drop_table($table_name[, $if_exists = FALSE])

cache_off()

select_min([$select = ''[, $alias = '']])

or_where($key[, $value = NULL[, $escape = NULL]])

escape_like_str($str)