Count of schema based on the value in a column

Question

I have to write a query to count the number of schema that have the value in a column as '1' in a table For ex
I have a table called Vendor in all the schemas(schema1 through 50) I have to look for the value in a column(Benefits) if it 1 or 0 . I need to do the count of the number of schema who have the Benefits turned ON (value '1')
suppose the value in benefits(col) in Vendor (tbl) for schema1 is 0 than donot count that schema
and if the value in benefits(col) in Vendor (tbl) for schema2 is 1 than count
do i connect as a system manager? Do I need a Pl/sql table to put the count in it
anybody please help.
TX
KK

Answer 1

As I understand from 325537 description, the table VENDOR contains only one row and column BENEFITS_TRACKING is either 0 or 1
In this case the total can be calculated by simply summing the values of all BENEFITS_TRACKING
In case VENDOR has more than one row you need some grouping function like SUM or COUNT
I don't unterstand why you loop through dba_users.
Im quite sure that you won't find a VENDORS table in the SYSTEM schema. The 'execute immediate' will fail with a table not found exception.
Another problem in your code is, you will get no_data_found exception when benefits_tracking=0 because of your where condition
(remove the where-condition or use a grouping function as explained above)
declare
  v_count      pls_integer := 0;
  v_curr_count pls_integer := 0;
begin
  for rec in (select owner from all_tables where owner like 'SCHEMA%' and table_name='VENDORS') loop
      execute immediate 'select SUM(BENEFITS_TRACKING) from '||rec.owner||'.VENDORS' into v_curr_count;
--      execute immediate 'select COUNT(BENEFITS_TRACKING) from '||rec.owner||'.VENDORS where BENEFITS_TRACKING=1' into v_curr_count;
--      execute immediate 'select BENEFITS_TRACKING from '||rec.owner||'.VENDORS' into v_curr_count;
      v_count := v_count + v_curr_count;
  end loop;
  dbms_output.put_line(v_count);
end;