Postgresは、jsonbの配列を使用して、最低価格から最高価格の順に並んでいます。

Question

私はタイトルなどの共通のプロパティと配列内のバリアントを持つ次の製品スキーマを持っています。

価格を最低から最高までどのように注文するのですか？ variantsをネスト解除する

drop table if exists product; 

create table product (
    id int, 
    data jsonb 
); 

insert into product values (1, ' 
{ 
    "product_id": 10000, 
    "title": "product 10000", 
    "variants": [ 
    { 
     "variantId": 100, 
     "price": 9.95, 
     "sku": 100, 
     "weight": 388 
    }, 
    { 
     "variantId": 101, 
     "price": 19.95, 
     "sku": 101, 
     "weight": 788 
    } 
    ] 
}'); 

insert into product values (2, ' 
{ 
    "product_id": 10001, 
    "title": "product 10001", 
    "variants": [ 
    { 
     "variantId": 200, 
     "price": 89.95, 
     "sku": 200, 
     "weight": 11 
    }, 
    { 
     "variantId": 201, 
     "price": 99.95, 
     "sku": 201, 
     "weight": 22 
    } 
    ] 
}'); 

insert into product values (3, ' 
{ 
    "product_id": 10002, 
    "title": "product 10002", 
    "variants": [ 
    { 
     "variantId": 300, 
     "price": 1.00, 
     "sku": 300, 
     "weight": 36 
    } 
    ] 
}'); 


select * from product; 

1;"{"title": "product 10000", "variants": [{"sku": 100, "price": 9.95, "weight": 388, "variantId": 100}, {"sku": 101, "price": 19.95, "weight": 788, "variantId": 101}], "product_id": 10000}" 
2;"{"title": "product 10001", "variants": [{"sku": 200, "price": 89.95, "weight": 11, "variantId": 200}, {"sku": 201, "price": 99.95, "weight": 22, "variantId": 201}], "product_id": 10001}" 
3;"{"title": "product 10002", "variants": [{"sku": 300, "price": 1.00, "weight": 36, "variantId": 300}], "product_id": 10002}" 

Answer 1

使用jsonb_array_elements()、例えば：

select 
    id, data->'product_id' product_id, 
    var->'sku' as sku, var->'price' as price 
from 
    product, jsonb_array_elements(data->'variants') var 
order by 4; 

id | product_id | sku | price 
----+------------+-----+------- 
    3 | 10002  | 300 | 1.00 
    1 | 10000  | 100 | 9.95 
    1 | 10000  | 101 | 19.95 
    2 | 10001  | 200 | 89.95 
    2 | 10001  | 201 | 99.95 
(5 rows)