Question

我有三个表，如DATA，SATURATION，VALUE，其中：

CREATE TABLE DATA(
  data_id INT AUTO_INCREMENT,
  PRIMARY KEY(data_id)
);

CREATE TABLE VALUE(
  value_id INT AUTO_INCREMENT,
  data_id INT,
  sample INT,
  channel_1 DOUBLE,
  channel_2 DOUBLE,
  channel_3 DOUBLE,
  PRIMARY KEY (value_id),
  FOREIGN KEY(data_id) REFERENCES DATA(data_id)
);

CREATE TABLE SATURATION(
  saturation_id INT AUTO_INCREMENT,
  data_id INT,
  sample INT,
  channel_1 INT CHECK (channel_1 >= 0 AND channel_1 <= 1),
  channel_2 INT CHECK (channel_2 >= 0 AND channel_2 <= 1),
  channel_3 INT CHECK (channel_3 >= 0 AND channel_2 <= 3),
  PRIMARY KEY (saturation_id),
  FOREIGN KEY(data_id) REFERENCES DATA(data_id)
);

我的查询如下：

SELECT s.sample AS 'S Sample', s.channel_1 AS '#Ch_1 S', s.channel_2 AS '#Ch_2 ES', s.channel_3 AS '#Ch_3 ES',
  v.sample AS 'V Sample', v.channel_1 AS '#Ch_1 V', v.channel_2 AS '#Ch_2 V', v.channel_3 AS '#Ch_3 V'
FROM VALUE v
  LEFT OUTER JOIN SATURATION s
  ON v.data_id = s.data_id
  WHERE s.sample = v.sample AND s.data_id = 1;

如果一个系列中的样本数相等，则结果可以。但我想要这样的事情：

-----------
| ES Sample | #Ch_1 ES | #Ch_2 ES | #Ch_3 ES | EV Sample | #Ch_1 EV | #Ch_2 EV | #Ch_3 EV |
-----------
| 1 | 1 | 0 | 1 | 1 | 114.5 | 10.2 | 114.5 |
-----------
| 2 | 0 | 0 | 1 | 2 | 114.5 | 10.2 | 114.5 |
-----------
| 3 | 0 | 0 | 1 | 3 | 114.5 | 10.2 | 114.5 |
-----------
| 4 | 1 | 0 | 1 | 4 | 114.5 | 10.2 | 114.5 |
-----------
| null | null | null | null | 5 | 114.5 | 10.2 | 114.5 |
-----------

怎么做？通常没有子句's.sample = v.sample'我得到this。我不希望在一个表中存储饱和度和值，但我想这是一个非常简单和愚蠢的解决方案。

更新

这是一个根据我的需要生成result的查询（如果我在一个系列中的值多于饱和度）：

SELECT v.data_id AS 'V ID', s.data_id AS 'S ID', s.sample AS 'S Sample', s.channel_1 AS '#Ch_1 S', s.channel_2 AS '#Ch_2 S', s.channel_3 AS '#Ch_3 S',
  v.sample AS 'V Sample', v.channel_1 AS '#Ch_1 V', v.channel_2 AS '#Ch_2 V', v.channel_3 AS '#Ch_3 V'
FROM SATURATION s RIGHT JOIN VALUE v ON v.sample = s.sample
WHERE (v.data_id = 1 OR s.data_id IS NULL) AND (s.data_id = 1 OR s.data_id IS NULL);

Answer 1

我会在数据和值以及饱和度之间创建一个示例表。因此，数据将包含许多样本，每个样本将具有零个或一个值以及零个或一个饱和度记录

然后从此Sample表中驱动查询，左边连接到Value和Saturation。

如果这没有意义，请告诉我，我会尽力澄清，但希望你能明白我的意思。

SQL连接没有多行

1 个答案: