Question

我有一个数据库查询输出我需要的数据，但我不知道如何将其变为我需要的格式（也需要将其转换为csv格式，但需要首先获得输出）。

SELECT `user_id`, `assessment_name`, `question_id`, `question_type_id`, `answer`, `created_at` FROM answer WHERE `assessment_id` = 1

输出是这样的（虽然每次提交有30行 - 这里只放三个作为例子）：

11  Three Intelligences 31  6   4   7/22/08 11:30
11  Three Intelligences 40  4   4   7/22/08 11:30
11  Three Intelligences 41  6   5   7/22/08 11:30
10  Three Intelligences 31  6   3   7/22/08 14:54
10  Three Intelligences 40  4   4   7/22/08 14:54
10  Three Intelligences 41  6   4   7/22/08 14:54
12  Three Intelligences 31  6   4   7/29/08 10:31
12  Three Intelligences 40  4   4   7/29/08 10:31
12  Three Intelligences 41  6   4   7/29/08 10:31

我需要的是重新格式化它以便它可以用于数据分析，这意味着为每个user_id和assessment_name和created_at

将数据分成一行

assessment_name, user_id, answer(for question 31), question_type_id(for question 31), answer(for question 40), question_type_id(for question 40), answer(for question 41), question_type_id(for question 41), created_at
Three Intelligences, 11, 6, 4, 4, 4, 6, 5, 7/22/08 11:30
Three Intelligences, 10, 6, 3, 4, 4, 6, 4, 7/22/08 14:54
Three Intelligences, 12, 6, 4, 4, 4, 6, 4, 7/29/08 10:31

这可能吗？如果是这样，我也假设我可以在php中完成它，但我不知道足以找出必要的'while'循环。它甚至可能不需要生成csv文件输出...如果我可以在页面上正确格式化它，我可以复制/粘贴此特定项目。

由于

- EDIT-- 这是我到目前为止所得到的 - 这将生成数据的半原始输出......我认为我需要的只是找出'while'中需要循环内的循环以获得所需的输出

<?php
require_once '../connection.php';	

// Create connection
$conn = new mysqli(localhost, $dbuser, $dbpass, $db);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
} 
	
	$query_responses = "SELECT `user_id`, `assessment_name`, `question_id`, `question_type_id`, `answer`, `created_at` FROM answer WHERE `assessment_id` = 1";
	$result_responses = $conn->query($query_responses);
	if ($result_responses->num_rows > 0) {
	    // output data of each row
	    while($row = $result_responses->fetch_assoc()){
	       echo $row["created_at"]. ", " .$row["assessment_name"]. ", " .$row["user_id"]. "," .$row["question_id"].  "," .$row["question_type_id"].  "," .$row["answer"].  "<br />";
	       
	    }
	} else {
	    echo "0 results";
	}
	$conn->close();
	
?>

Answer 1

这就是你要找的东西：

SELECT
  `user_id`,
  `assessment_name`,
  CONCAT(
  GROUP_CONCAT(
    CONCAT(`question_type_id`, ', ', `answer`)
   SEPARATOR ', ' ), ', ', `created_at`) AS RESULT
FROM answer 
WHERE `assessment_id` = 1
GROUP BY `user_id`
ORDER BY `user_id`;

<强>示例

MariaDB []> SELECT
    ->   `user_id`,
    ->   `assessment_name`,
    ->   CONCAT(
    ->   GROUP_CONCAT(
    ->     CONCAT(`question_type_id`, ', ', `answer`)
    ->    SEPARATOR ', ' ), ', ', `created_at`) AS RESULT
    -> FROM answer
    -> -- WHERE `assessment_id` = 1
    -> GROUP BY `user_id`
    -> ORDER BY `user_id`;
+---------+---------------------+---------------------------------------------+
| user_id | assessment_name     | RESULT                                      |
+---------+---------------------+---------------------------------------------+
|      11 | Three Intelligences | 6, 4, 4, 4, 6, 5, 2016-01-01 00:00:00       |
|      12 | Three Intelligences | 6, 4, 6, 4, 6, 4, 6, 4, 2016-01-01 00:00:00 |
+---------+---------------------+---------------------------------------------+
2 rows in set (0.00 sec)

MariaDB []>

请告诉我它是否适合您

操作/格式化数据库输出

1 个答案: