Combinare tutti i prodotti

Fa parte della sezione Fondamenti del percorso SQL di Coddy. Lezione 55 di 72.

Sfida

Medio

Tabelle e colonne disponibili:
enom_gilpane: part_id, rpm, watt, size
castle_loctus: part_id, rpm, watt, size
honpan_bilopsa: part_id, rpm, watt, size
yurnol_qoltam: part_id, rpm, watt, size

Ora calcola la stessa qualità per tutti i prodotti (ogni tabella è un prodotto) e combinali tutti usando UNION ALL:

quality_table as (
    SELECT * FROM filtered_quality_1
    UNION ALL
    SELECT * FROM filtered_quality_2
    UNION ALL 
    SELECT * FROM filtered_quality_3
    UNION ALL 
    SELECT * FROM filtered_quality_4
)

Restituisci part_id e quality

Provalo tu

-- El primer bloque de producto ya está hecho; se ha trasladado de la lección anterior
WITH filtered_enom_gilpane_quality as (
    WITH enom_gilpane_quality as (
        SELECT part_id, ((rpm * watt) / size) as quality
        FROM (
            SELECT part_id, rpm, watt + (select avg(watt) from enom_gilpane) as watt, size
            FROM enom_gilpane
        )
    )

    SELECT *
    FROM enom_gilpane_quality
    WHERE quality > (select avg(quality) from enom_gilpane_quality)
),
-- Crea el mismo bloque para cada una de las tres tablas de productos siguientes
filtered_castle_loctus_quality as (
    ____
),
filtered_honpan_bilopsa_quality as (
    ____
),
filtered_yurnol_qoltam_quality as (
    ____
),
-- Apila los cuatro bloques uno sobre otro, conservando todas las filas
quality_table as (
    SELECT * FROM filtered_enom_gilpane_quality
    ____
)

SELECT ____
FROM quality_table