Unir tablas PIVOT eliminando duplicados - Bigquery

fusion.sql

CREATE OR REPLACE TABLE `tabla_c` AS
(
    WITH tabla_intermedia AS (
        SELECT * FROM `tabla_a` #Tabla Inicial
        UNION DISTINCT
        SELECT * FROM `tabla_2` #Tabla particionada 2
    )

    SELECT row[OFFSET(0)].* FROM (
      SELECT ARRAY_AGG(t ORDER BY fecha_consulta DESC LIMIT 1) row
      FROM tabla_intermedia t
      GROUP BY id_interno
    )ORDER BY id_interno
)