sql - SQL SUM が機能しない - そう思われる

Question

スキーマ:

-- phpMyAdmin SQL Dump
-- version 3.4.5
-- http://www.phpmyadmin.net
SET SQL_MODE="NO_AUTO_VALUE_ON_ZERO";
SET time_zone = "+00:00";
CREATE TABLE IF NOT EXISTS `links` (
  `pageId` int(10) unsigned NOT NULL,
  `linkId` int(10) unsigned NOT NULL,
  `whenUsed` datetime NOT NULL,
  `whenRendered` datetime NOT NULL,
  KEY `pageId` (`pageId`),
  KEY `linkId` (`linkId`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
INSERT INTO `links` (`pageId`, `linkId`, `whenUsed`, `whenRendered`) VALUES
(1, 9, '2013-02-14 00:44:20', '2013-02-14 00:42:39'),
(1, 9, '2013-02-14 00:44:21', '2013-02-14 00:42:39'),
(1, 9, '2013-02-14 00:44:23', '2013-02-14 00:44:21'),
(1, 8, '2013-02-14 00:44:25', '2013-02-14 00:44:23'),
(1, 7, '2013-02-14 00:44:26', '2013-02-14 00:44:25'),
(1, 6, '2013-02-14 00:44:28', '2013-02-14 00:44:26'),
(1, 3, '2013-02-14 00:44:29', '2013-02-14 00:44:26'),
(1, 7, '2013-02-14 00:44:31', '2013-02-14 00:44:29'),
(1, 8, '2013-02-14 00:44:32', '2013-02-14 00:44:31'),
(1, 11, '2013-02-14 00:44:34', '2013-02-14 00:44:32');

内部クエリ:

SELECT `linkId`, 
TIMEDIFF(`whenUsed`, `whenRendered`) AS 'URDiff', 
CONVERT(DATEDIFF(`whenUsed`, UTC_TIMESTAMP()), SIGNED) AS 'dateDiff',
CONVERT('dateDiff' = 0, UNSIGNED) AS 'usedToday',
CONVERT('dateDiff' < 8 AND 'dateDiff' > 0, UNSIGNED) AS 'usedThisWeek',
CONVERT('dateDiff' < 31 AND 'dateDiff' > 7, UNSIGNED) AS 'usedThisMonth', 
CONVERT('dateDiff' < 365 AND 'dateDiff' > 30, UNSIGNED) AS 'usedThisYear'
FROM `links` 
WHERE MINUTE('URDiff') < 15 AND HOUR('URDiff') = 0
AND `pageId` = '1'
) AS T

内部クエリの結果:

+--------+----------+----------+-----------+--------------+---------------+--------------+
| linkId | URDiff   | dateDiff | usedToday | usedThisWeek | usedThisMonth | usedThisYear |
+--------+----------+----------+-----------+--------------+---------------+--------------+
|      9 | 00:01:41 |        0 |         1 |            0 |             0 |            0 |
|      9 | 00:01:42 |        0 |         1 |            0 |             0 |            0 |
|      9 | 00:00:02 |        0 |         1 |            0 |             0 |            0 |
|      8 | 00:00:02 |        0 |         1 |            0 |             0 |            0 |
|      7 | 00:00:01 |        0 |         1 |            0 |             0 |            0 |
|      6 | 00:00:02 |        0 |         1 |            0 |             0 |            0 |
|      3 | 00:00:03 |        0 |         1 |            0 |             0 |            0 |
|      7 | 00:00:02 |        0 |         1 |            0 |             0 |            0 |
|      8 | 00:00:01 |        0 |         1 |            0 |             0 |            0 |
|     11 | 00:00:02 |        0 |         1 |            0 |             0 |            0 |
+--------+----------+----------+-----------+--------------+---------------+--------------+

外部クエリ:

SELECT 
`linkId`,
SUM('T.usedToday') AS 'countToday',
SUM('T.usedThisWeek') AS 'countThisWeek',
SUM('T.usedThisMonth') AS 'countThisMonth',
SUM('T.usedThisYear') AS 'countThisYear'
FROM
(
SELECT `linkId`, 
TIMEDIFF(`whenUsed`, `whenRendered`) AS 'URDiff', 
CONVERT(DATEDIFF(`whenUsed`, UTC_TIMESTAMP()), SIGNED) AS 'dateDiff',
CONVERT('dateDiff' = 0, UNSIGNED) AS 'usedToday',
CONVERT('dateDiff' < 8 AND 'dateDiff' > 0, UNSIGNED) AS 'usedThisWeek',
CONVERT('dateDiff' < 31 AND 'dateDiff' > 7, UNSIGNED) AS 'usedThisMonth', 
CONVERT('dateDiff' < 365 AND 'dateDiff' > 30, UNSIGNED) AS 'usedThisYear'
FROM `links` 
WHERE MINUTE('URDiff') < 15 AND HOUR('URDiff') = 0
AND `pageId` = '1'
) AS T
GROUP BY `linkId`

外部クエリの結果:

+--------+------------+---------------+----------------+---------------+
| linkId | countToday | countThisWeek | countThisMonth | countThisYear |
+--------+------------+---------------+----------------+---------------+
|      3 |          0 |             0 |              0 |             0 |
|      6 |          0 |             0 |              0 |             0 |
|      7 |          0 |             0 |              0 |             0 |
|      8 |          0 |             0 |              0 |             0 |
|      9 |          0 |             0 |              0 |             0 |
|     11 |          0 |             0 |              0 |             0 |
+--------+------------+---------------+----------------+---------------+

図に行きますか？内部の結果から、linkId 9 の usedToday 列に 1 の行が 3 つあることが明確にわかります (これらを unsigned に変換したので、合計は問題ありません)。しかし、linkId 9 の countToday は 3 ではなく 0 です。なんで？

MySQL から興味深い警告がいくつか表示されます。

Warning (Code 1292): Truncated incorrect time value: 'URDiff'
Warning (Code 1292): Truncated incorrect time value: 'URDiff'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'dateDiff'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'dateDiff'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'dateDiff'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'dateDiff'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'dateDiff'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'dateDiff'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'dateDiff'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedToday'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedThisWeek'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedThisMonth'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedThisYear'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedToday'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedThisWeek'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedThisMonth'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedThisYear'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedToday'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedThisWeek'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedThisMonth'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedThisYear'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedToday'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedThisWeek'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedThisMonth'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedThisYear'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedToday'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedThisWeek'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedThisMonth'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedThisYear'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedToday'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedThisWeek'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedThisMonth'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedThisYear'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedToday'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedThisWeek'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedThisMonth'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedThisYear'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedToday'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedThisWeek'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedThisMonth'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedThisYear'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedToday'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedThisWeek'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedThisMonth'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedThisYear'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedToday'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedThisWeek'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedThisMonth'
Warning (Code 1292): Truncated incorrect DOUBLE value: 'T.usedThisYear'

この警告について私がオンラインで見つけたものから、名前に引用符を使用しなかった一部の人々に発生しているようです (私はどこでも使用しています)。では、なぜパーサーはクォートの使用に対してこのような警告を出すのでしょうか?

score 2 · Accepted Answer

お父さん！機能したクエリは次のとおりです。

SELECT
`linkId`,
SUM(T.usedToday)ascountToday,
SUM(T.usedThisWeek)as countThisWeek,
SUM(T.usedThisMonth)as countThisMonth,
SUM(T.usedThisYear)as countThisYear
FROM

(
    SELECT `linkId`,
    TIMEDIFF(`whenUsed`, `whenRendered`) as URDiff,
    DATEDIFF(`whenUsed`, UTC_TIMESTAMP()) as `dateDiff`,
    if(DATEDIFF(`whenUsed`, UTC_TIMESTAMP()) = 0, 1, 0)as usedToday,
    if(DATEDIFF(`whenUsed`, UTC_TIMESTAMP()) < 8 AND DATEDIFF(`whenUsed`, UTC_TIMESTAMP()) > 0, 1, 0)as usedThisWeek,
    if(DATEDIFF(`whenUsed`, UTC_TIMESTAMP()) < 31 AND DATEDIFF(`whenUsed`, UTC_TIMESTAMP()) > 7, 1, 0) as usedThisMonth,
    if(DATEDIFF(`whenUsed`, UTC_TIMESTAMP()) < 365 AND DATEDIFF(`whenUsed`, UTC_TIMESTAMP()) > 30, 1, 0) as usedThisYear
    FROM `links`
    WHERE MINUTE(TIMEDIFF(`whenUsed`, `whenRendered`)) < 15 AND HOUR(TIMEDIFF(`whenUsed`, `whenRendered`)) = 0
    AND `pageId` = 1
) as T

GROUP BY `linkId`

sql - SQL SUM が機能しない - そう思われる

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