我是postgresql的新手，我有一些这样的查询：
SELECT * FROM "trx_mutualfund_trade" RIGHT JOIN "trx_mutualfund_nav" ON "trx_mutualfund_trade"."mtr_trade_time"::timestamp::date = trx_mutualfund_nav.mna_efective_date ....
我试着写这样的CI代码：
$this->db->select('*');
$this->db->from('mutualfund_trade');
$this->db->join('mutualfund_nav', 'mutualfund_trade.mtr_trade_time::timestamp::date = mutualfund_nav.mna_efective_date', 'right');
但是CI代码会生成这样的查询：
SELECT * FROM "trx_mutualfund_trade" RIGHT JOIN "trx_mutualfund_nav" ON "trx_mutualfund_trade"."mtr_trade_time"::"timestamp::date" = mutualfund_nav.mna_efective_date...
所以它不能运行，因为::"timestamp::date" 上有一个双引号
有人可以帮我展示如何简洁地编写CI代码吗？感谢
使用此：
$query = $this->db->query("SELECT * FROM trx_mutualfund_trade RIGHT JOIN trx_mutualfund_nav ON trx_mutualfund_trade.mtr_trade_time::timestamp::date = trx_mutualfund_nav.mna_efective_date");
$result = $query->result_array();
return $result