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Developer-C 11.1
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with Compania as( select 1 cia_clave, 'impresa_b' cia_nom, 'asdasdasd' cia_rfc from dual union all select 2 cia_clave, 'impresa_c' cia_nom, 'yxcyxcyxc' cia_rfc from dual union all select 123 cia_clave, 'impresa_q' cia_nom, 'QWEQWEQWE' cia_rfc from dual ), Periodo as ( select '2018 - 2019' periodo, 1 valor from dual union all select '2019 - 2020' periodo, 2 valor from dual ) SELECT COMPANIA.CIA_CLAVE,COMPANIA.CIA_NOM, CASE WHEN Periodo.valor IS NULL THEN 'N' ELSE 'Y' END VAC_APLICA FROM Compania LEFT JOIN Periodo ON COMPANIA.CIA_CLAVE = Periodo.valor AND Periodo.PERIODO = '2018 - 2019' order by 1
CIA_CLAVE
CIA_NOM
VAC_APLICA
1
impresa_b
Y
2
impresa_c
N
123
impresa_q
N