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SUBTRAÇÃO DE DOIS SELECTS(TIME)


Ricardson Couto
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Meus caros,

Como eu faço a subtração de dois selects com valores do tipo hora(time)?

Abaixo segue o meu código:

select SEC_TO_TIME( SUM( TIME_TO_SEC( valor ) ) )
FROM
((SELECT  
SEC_TO_TIME( SUM( TIME_TO_SEC( IIRTN_MessageTime ) ) )valor /*inicio de trabalho*/
from returnmessage_iirtn where IIRTN_MacroNumber = 9)
UNION
(SELECT  
SEC_TO_TIME( SUM( TIME_TO_SEC( IIRTN_MessageTime ) ) )valor /*inicio almoco*/
from returnmessage_iirtn where IIRTN_MacroNumber = 10) 
) returnmessage_iirtn;

 

P.S: EU CONSIGO SOMAR AS HORAS, MAS não SUBTRAIR

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