how to update all tables with a particular column name

Question

I am trying to update all tables starting with string like \'agg%\' and column_name =\'%userid%\'... But i dont see any such examples online even though i was able to find o

Answer 1

To get the update query for your condition

     select 
        'update '||c.table_name||' set '||c.COLUMN_NAME||' = ''rajeev'';' 
         as my_update_query
     from 
        (select 
            table_name,COLUMN_NAME
         from INFORMATION_SCHEMA.COLUMNS 
         where table_name LIKE 'agg%' and COLUMN_NAME LIKE '%userid%') c

---

To execute

 do $$
  declare
    arow record;
  begin
    for arow in
    select 
        'update '||c.table_name||' set '||c.COLUMN_NAME||' = ''rajeev'';' 
         as my_update_query
     from 
        (select 
            table_name,COLUMN_NAME
         from INFORMATION_SCHEMA.COLUMNS 
         where table_name LIKE 'agg%' and COLUMN_NAME LIKE '%userid%') c
    loop
     execute arow.my_update_query;
    end loop;
  end;
$$;