thinkphp联表查询这样写为什么没有结果？

Question

$sql = "select p.*,u.key_name from record p left join sys_user u on p.create_entity=u.id where u.key_name='admin' and p.punch_time between '2017-03-01' and '2017-03-08'";
$hr_punch_record = M() -> query("$sql");
var_dump($hr_punch_record);

Answer 1

thinkphp joint table query written like this why there is no result? -PHP Chinese website Q&A-thinkphp joint table query written like this why there is no result? -PHP Chinese website Q&A

Let’s take a look and learn.

Answer 2

$hr_punch_record = M() -> query("$sql");

换成

$hr_punch_record = M() -> query($sql);