質問編集履歴
1
質問自体の修正
test
CHANGED
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File without changes
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test
CHANGED
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@@ -1,44 +1,57 @@
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1
1
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下記テーブルを作成し、データをインサートします。
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2
2
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```
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3
3
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CREATE TABLE table1(id integer);
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4
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+
CREATE TABLE table2 (id integer, pcs integer, category integer);
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4
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-
CREATE TABLE table
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5
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+
CREATE TABLE table1(id integer, value text);
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5
6
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6
7
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INSERT INTO table1(1);
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7
8
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INSERT INTO table1(2);
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8
9
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9
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-
INSERT INTO table2(1, 10);
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10
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+
INSERT INTO table2 VALUES(1, 10, 1);
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10
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-
INSERT INTO table2(1,
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11
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+
INSERT INTO table2 VALUES(1, 9, 1);
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12
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+
INSERT INTO table2 VALUES(1, 8, 2);
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13
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+
INSERT INTO table2 VALUES(1, 7, 2);
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11
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-
INSERT INTO table2(2,
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14
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+
INSERT INTO table2 VALUES(2, 6, 1);
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15
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+
INSERT INTO table2 VALUES(2, 5, 1);
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12
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-
INSERT INTO table2(2,
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16
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+
INSERT INTO table2 VALUES(2, 4, 2);
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17
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+
INSERT INTO table2 VALUES(2, 3, 2);
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18
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+
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19
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INSERT INTO table3 VALUES(1, 'a');
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20
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INSERT INTO table3 VALUES(1, 'b');
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21
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```
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22
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15
23
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これを各idごとにpcsの合計値を表示したいです。
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16
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-
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24
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+
ただしcategory が1のもののみ。
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作ったSELECT文
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```
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20
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-
SELECT table1.id, SUM(table2.pcs)
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+
SELECT table1.id, SUM(table2.pcs), table3.value
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FROM table1
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21
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LEFT JOIN table2
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ON table1.id = table2.id
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AND table2.category = 1
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GROUP BY table1.id
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LEFT JOIN table3
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ON table1.id = table3.id
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```
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38
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エラー
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26
39
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```
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27
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-
ERROR: column "table1.id" must appear in the GROUP BY clause or be used in an aggregate function
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28
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-
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40
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+
ERROR: syntax error at or near "LEFT"
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LINE 7: LEFT JOIN table3
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42
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^
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43
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+
SQL 状態: 42601
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44
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+
文字: 146
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29
45
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```
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30
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-
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31
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-
GROUP BY を使うように言われているのですが、
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32
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-
JOINに対してどのように使えばよいか分かりません。
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33
46
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34
47
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回答よろしくお願いします。
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35
48
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36
49
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期待値
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37
50
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```
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38
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-
id, su
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51
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+
id, pcs, value
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39
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-
---------
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52
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+
--------------
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40
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-
1, 1
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53
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+
1, 19, a
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41
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-
2, 1
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54
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+
2, 11, b
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42
55
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```
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43
56
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44
57
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psql (PostgreSQL) 14.1
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