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126440 transponer-un-resultado-de-una-columna-a-otra-en-postgres

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   postgresql_version
1 PostgreSQL 9.6.2, compiled by Visual C++ build 1800, 64-bit
   id concept year_id mes_10 mes_11 mes_12
1 1234 D 2017 18 8,5000 8
2 1234 C 2017 17 7,4000 7
3 1234 A 2017 15 5,2000 5
4 1234 B 2017 16 6,3000 6