Question

我从查询中得到了返回结果，但我希望它返回多个结果，这是当前查询：

$qry = "SELECT * FROM properties WHERE isLeased = 0 AND featured = 1 ORDER BY RAND() LIMIT 9";
$res = mysqli_query($mysqli, $qry) or die('-1' . mysqli_error());

我希望它能够返回这些结果，以及结果：

$qry = "SELECT * FROM properties WHERE isLeased = 0 AND propertyType = 'For Sale' ORDER BY RAND() LIMIT 3";
$res = mysqli_query($mysqli, $qry) or die('-1' . mysqli_error());

但是，如果我只是在第一部分下面添加第二部分代码，它只会返回第一部分的结果。

我怎么能告诉它根据几张表返回结果？

Answer 1

您可以使用UNION查询：

SELECT t1.*
FROM
(
    SELECT *
    FROM properties
    WHERE isLeased = 0 AND featured = 1
    ORDER BY RAND()
    LIMIT 9
) t1
UNION ALL
SELECT t2.*
FROM
(
    SELECT *
    FROM properties
    WHERE isLeased = 0 AND propertyType = 'For Sale'
    ORDER BY RAND()
    LIMIT 3
) t2

从多个表字段返回结果

1 个答案: