json - 在 postgresql 中拆分 JSON 列

Question

我有一个表，其中有一列具有 JSON 值。此栏目过于拥挤，无法从栏目中获取详细信息。

   Company     User
    A   [{"Name":"Mark","email":"mark.com","password":"password"},{"Name":"Keith","email":"Keith.com","password":"password"}]
    B   [{"Name":"Anna","email":"anna.com","password":"password"},{"Name":"Lewis","email":"Lewis.com","password":"password"}]
    C   [{"Name":"Bill","email":"bill.com","password":"password"},{"Name":"Stuart","email":"stuart.com","password":"password"}]

有什么方法可以在 select 语句中打破如下所示的列

Company User_1_name User_1_email User_1_password User_2_name User_2_email User_2_password
A         Mark      mark.com       password        Keith      Keith.com     password
B         Anna      anna.com       password        Lewis      Lewis.com     password
C         Bill      bill.com       password        Stuart     stuart.com    password

Answer 1

由于根据您的评论，该列未定义为 jsonb 或 json，因此您需要进行强制转换才能使其正常工作:

select company, 
       (user::jsonb)->0->>'Name' as user_1_name,
       (user::jsonb)->0->>'email' as user_1_email,
       (user::jsonb)->0->>'password' as user_1_password,       
       (user::jsonb)->1->>'Name' as user_2_name,
       (user::jsonb)->1->>'email' as user_2_email,
       (user::jsonb)->1->>'password' as user_2_password
  from your_table;

如果每行的用户数量有所不同，那么您将需要添加尽可能多的列以捕获最大大小。

如果任何行的 user 列中包含无效的 json，则此操作将不起作用。