回答編集履歴
2
質問内容の訂正に合わせてコード修正
test
CHANGED
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@@ -1,6 +1,10 @@
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1
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+
companyが"A" で、value が Null でないYearが最大のレコードを抽出
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2
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+
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3
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+
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4
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+
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1
5
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```SQL
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2
6
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3
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-
SELECT
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7
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+
SELECT table_a.*
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4
8
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5
9
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FROM table_a
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6
10
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@@ -17,3 +21,35 @@
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17
21
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WHERE value Is Not Null AND company="A");
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18
22
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19
23
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```
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24
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+
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25
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+
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26
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+
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27
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+
company毎に、value が Null でないYearが最大のレコードを抽出
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28
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+
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29
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+
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30
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+
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31
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+
```SQL
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32
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+
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33
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+
SELECT a.*
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34
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+
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35
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FROM
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36
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+
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37
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table_a AS a INNER JOIN
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38
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+
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39
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+
(SELECT company, Max(Year) AS maxYear
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40
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+
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41
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FROM table_a
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42
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+
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43
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WHERE value Is Not Null
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44
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+
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45
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GROUP BY company) AS b
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46
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+
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47
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ON a.company = b.company AND a.year = b.maxYear
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48
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+
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49
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WHERE a.value Is Not Null;
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50
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+
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51
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+
```
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52
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+
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53
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+
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54
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+
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55
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+
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1
コードの間違い訂正
test
CHANGED
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@@ -6,12 +6,14 @@
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6
6
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7
7
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WHERE
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8
8
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9
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+
company="A" AND
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10
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+
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9
11
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value is not null AND
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10
12
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11
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-
year = (SELECT Max(
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13
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+
year = (SELECT Max(Year)
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12
14
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13
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-
FROM table_a
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15
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+
FROM table_a
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14
16
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15
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-
WHERE
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17
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+
WHERE value Is Not Null AND company="A");
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16
18
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17
19
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```
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