Question

我的表名是拥有is_nse，布尔列和交换列类型json的公司，其值类似于＆＃34; [{＆＃34; exchange＆＃34;：＆＃34; NSE＆＃34;，＆＃34;自动收报机＆＃34;：＆＃34; ABC＆＃34;}，{＆＃34;交换＆＃34;：＆＃34; BSE＆＃34;＆＃34;股票＆＃34;：＆＃34; ABC＆＃34 ;}]＆＃34;

现在我有了这个查询

 update companies set is_nse=0 from (SELECT is_nse, obj.value->>'exchange' As exch FROM  (SELECT * FROM   companies WHERE  sector is not null) u JOIN LATERAL json_array_elements(exchanges) obj(value) ON obj.value->>'exchange' = 'BSE')y

但它更新了公司表中的所有行而不是子查询的行。可以有人告诉我哪里出错了吗？

Answer 1

您需要将companies中的update与from子句相关联。假设你有一个id，你可以这样做：

update companies
    set is_nse = 0
    from (select c.*
          from companies u join lateral
               json_array_elements(exchanges) obj(value)
               on obj.value->>'exchange' = 'BSE'
          where u.sector is not null
         ) y
    where y.companyid = companies.companyid ;

根据其他列POSTGRES中的键值更新表列

1 个答案: