1
我有數據,其中每行代表完整的審查中的一個句子。每一行都有一個分數(-1到1)。按多組的平均數計算
從這個角度來看,我目前製作了3個視圖,每個視圖按日,月或周分組,並且彙總了評論的平均得分,並計算其中有多少是正數,有多少是負數。
了從View例如每天查詢:
SELECT
`review_score_view`.`review_date` AS `review_date`,
COUNT(`review_score_view`.`review_id`) AS `review_count`,
(AVG(`review_score_view`.`score`) * 100) AS `average_score`,
SUM((CASE
WHEN (`review_score_view`.`score` >= 0) THEN 1
ELSE 0
END)) AS `positive_count`,
SUM((CASE
WHEN (`review_score_view`.`score` < 0) THEN 1
ELSE 0
END)) AS `negative_count`
FROM
`review_score_view`
GROUP BY `review_score_view`.`review_date`
而且我得到結果是這樣的:
| id | review_date | review_count | average_score | positive_count | negative_count |
|-----|--------------|--------------|-----------------|----------------|----------------|
| 521 | 2015-01-01 | 4 | -25.0000 | 2 | 2 |
| 519 | 2015-01-07 | 1 | -100.0000 | 0 | 1 |
| 518 | 2015-01-25 | 1 | 100.0000 | 1 | 0 |
| 516 | 2015-03-09 | 7 | 57.1429 | 6 | 1 |
| 515 | 2015-04-26 | 2 | -50.0000 | 1 | 1 |
| 224 | 2015-06-01 | 68 | -23.5294 | 40 | 28 |
| 222 | 2015-06-02 | 26 | -100.0000 | 1 | 25 |
| 221 | 2015-06-03 | 41 | -36.5854 | 19 | 22 |
| 220 | 2015-06-04 | 6 | -50.0000 | 2 | 4 |
問題:我怎樣才能從這些視圖結果另一個查詢基礎上平均得分。對於每個結果(分數類別),根據分組,每月,每週或每天,我想得到這5個結果的總和。看起來像一個容易的事情,但我無法繞過它。
SUM((CASE
WHEN (average_score >= 75) THEN 1
ELSE 0
END)) AS very_positive,
SUM((CASE
WHEN (average_score between 4 and 74) THEN 1
ELSE 0
END)) AS positive,
SUM((CASE
WHEN (average_score between -5 and 5) THEN 1
ELSE 0
END)) AS neutral,
SUM((CASE
WHEN (average_score between -4 and -74) THEN 1
ELSE 0
END)) AS negative,
SUM((CASE
WHEN (average_score <= -75) THEN 1
ELSE 0
END)) AS very_negative
最後我只是繪製數據。在Excel中製作簡單的例子:
在此先感謝。
非常感謝,正是我期待的! – Vaelyr