Question

我想从两个独立工作的查询或一个可以合并我的两个查询的查询生成单个结果响应。

我的第一个问题是：

    $query =" SELECT *
    FROM locationdetails
    WHERE user_id = " . $userid . " AND trip IN (SELECT DISTINCT trip FROM locationdetails
    GROUP BY trip
    HAVING _id = max( _id ))
    ORDER BY trip DESC
    LIMIT 0 , 5";

第二个查询几乎相同：

$query =" SELECT *
    FROM locationdetails
    WHERE user_id = " . $userid . " AND trip IN (SELECT DISTINCT trip FROM locationdetails)
    GROUP BY trip
    HAVING _id = min( _id )
    ORDER BY trip DESC
    LIMIT 0 , 5";

但我需要生成一个响应。需要一些直接的帮助。我也通过以下方法生成响应：

    function ExecuteQuery($query) {
    $response = new ApiResult();

    if (mysqli_query($this->con, $query)) {

        $results_array = array();
        $sqlResult = mysqli_query($this->con, $query);

        while ($row = $sqlResult->fetch_assoc()) {
            $results_array[] = $row;
        }

        if ($results_array != null || !empty($results_array)) {
            $response->Message = 'SUCCESSFULL';
            $response->Result = $results_array;

        } else {
            $response->Message = 'SUCCESSFULL';
            //  $response->Result = 'N;
        }
        mysqli_close($this->con);
    } else {
        $response->Message = 'Some Internal problem occurred';
        $response->Error = true;
    }

    return $response;
}

Answer 1

如下：

$query =" SELECT trip, MIN(_id) AS minid, MAX(_id) AS maxid
    FROM locationdetails
    WHERE user_id = " . $userid . "
    GROUP BY trip
    ORDER BY trip DESC
    LIMIT 0 , 5";

这将为您提供每个不同行程的列表，其中包含每个行程的最小和最大ID。

Answer 2

如果您想要来自两个查询的唯一记录，请使用UNION 和如果您想要两个查询中的所有记录，请使用UNION ALL。

    (SELECT   *
    FROM     locationdetails
    WHERE    user_id = " . $userid . " AND trip IN (SELECT DISTINCT trip FROM locationdetails
    GROUP BY trip
    HAVING   _id = max( _id ))
    ORDER BY trip DESC
    LIMIT    0 , 5
    )
    UNION
    OR
    UNION ALL
    (SELECT  *
    FROM     locationdetails
    WHERE    user_id = " . $userid . " AND trip IN (SELECT DISTINCT trip FROM locationdetails)
    GROUP BY trip
    HAVING   _id = min( _id )
    ORDER BY trip DESC
    LIMIT    0 , 5
    )

创建单个结果数组作为来自两个查询的响应

2 个答案: