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Developer-C 11.1
3.0
4.0
10.2
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5.5
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13
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15
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17
2012
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CREATE TABLE tab AS SELECT 1 AS id, 2 AS id2, 10 AS value UNION ALL SELECT 1,3,20 UNION ALL SELECT 1,4,30 UNION ALL SELECT 2,3,10 UNION ALL SELECT 2,4,40 UNION ALL SELECT 3,4,10
WITH cte AS ( SELECT id, value FROM tab UNION ALL SELECT id2, value FROM tab ) SELECT id, AVG(value) AS value FROM cte GROUP BY id;
id
value
1
20
2
20
3
13.333333333333
4
26.666666666667