在PostgreSQL上過濾JSONB列不起作用

Question

我在jsonb類型的列中存儲了以下JSON。我想查詢外部數組的第二個元素，並過濾'cid'列中值爲'CID1'的所有行。

{"root":[[ 
      {"cid":"CID1","Display":"User One","FName":"User","LName":"One"}, 
      {"cid":"CID1","Display":"User Two","FName":"User","LName":"Two"}, 
      {"cid":"CID1","Display":"User Three","FName":"User","LName":"Three"}, 
      {"cid":"CID2","Display":"User One","FName":"User","LName":"One"}, 
      {"cid":"CID2","Display":"User Two","FName":"User","LName":"Two"}, 
      {"cid":"CID2","Display":"User Three","FName":"User","LName":"Three"}  

      ], 
      [ 
      {"cid":"CID1","Display":"User One","FName":"Userfff","LName":"One"}, 
      {"cid":"CID1","Display":"User Two","FName":"User","LName":"Two"}, 
      {"cid":"CID1","Display":"User Three","FName":"User","LName":"Three"}, 
      {"cid":"CID2","Display":"User One","FName":"User","LName":"One"}, 
      {"cid":"CID2","Display":"User Two","FName":"User","LName":"Two"}, 
      {"cid":"CID2","Display":"User Three","FName":"User","LName":"Three"}  
      ]]} 

我寫了下面的查詢，併成功地但是從第二數組作爲JSON對象檢索所有的行，當我嘗試對其進行過濾，得到錯誤

42703：列「 filterin」不存在

select jsonb_array_elements((ARRAY(select jsonb_array_elements(msg->'root') ele))[2]::jsonb) filterin 
from js 
where filterin->>'cid'='CID1'; 

我應該糾正下面的查詢，使我能夠在列過濾器？

Answer 1

輸出別名不能在WHERE部分中使用。你有兩個選擇：子查詢或複製定義。

select jsonb_array_elements((ARRAY(select jsonb_array_elements(msg->'root') ele))[2]::jsonb) filterin 
from js 
where jsonb_array_elements((ARRAY(select jsonb_array_elements(msg->'root') ele))[2]::jsonb)->>'cid'='CID1'; 

或

SELECT filterin FROM 
(select jsonb_array_elements((ARRAY(select jsonb_array_elements(msg->'root') ele))[2]::jsonb) filterin 
from js) data 
WHERE filterin->>'cid'='CID1';