Postgresql 加入 json 陣列

Question

我正在嘗試編寫一個涉及 JSON 數組連接的查詢。 以下是表格

提案表：

id       details
1        {units: [1, 2]}
2        {units: [1]}

單位表：

id   DMA_ID
1    1
2    2

DMA表：

id    name
1     SOLAPUR
2     PUNE

Output：

DMA_NAME,   Count of proposals
SOLAPUR     2
PUNE        1

我的一些嘗試是，

SELECT 
    dma.name,
    count(
    CASE
        WHEN EXISTS p.id from proposals_proposal p where (p.details->>'units')::jsonb->>u.unit_id is not null then 1
        ELSE 0
    )
FROM signs_dma dma JOIN signs_unit u ON dma.id=u.dma_id;

任何幫助表示贊賞。 提前致謝！

Answer 1

您可以使用下一個查詢：

SELECT DMA.name, COUNT(*) PROPOSAL_COUNT
FROM DMA 
JOIN UNITS ON DMA.id=UNITS.dma_id
JOIN PROPOSAL ON to_jsonb(UNITS.id) <@ (PROPOSAL.details->'UNITS')
GROUP BY DMA.name;

SQL 在線編輯

Answer 2

這完成了工作

with base_proposal as (select id, jsonb_array_elements(details->'units') unit_id, created from proposals_proposal)
    select
        TRIM(dma.name) DMA, count(distinct bp.id) Proposals
    from base_proposal bp 
    join signs_unit unit on unit.unit_id=bp.unit_id
    join signs_dma dma on unit.dma_id = dma.id 
    where bp.created between {{start_date}} and {{end_date}} 
    group by TRIM(dma.name) order by count(distinct bp.id);