(select 'tabela_01' from dual)
union all
(select 'tabela_02' from dual)
union all
(select 'tabela_03' from dual)
SELECT A.VALOR_A,
B.VALOR_B
FROM (SELECT SUM(VALOR) VALOR_A
FROM TABELA_A) A,
(SELECT SUM(VALOR) VALOR_B
FROM TABELA_B) B
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