Count specific match from complete table data in Oracle DB - sql

Question

I want to count "Yes" and "No" from the below table data irrespective of the columns.
Oracle DB Table:
Intended Output:
It doesn't matter from which column it is coming. I just want to calculate the total count of Yes and No.
I tried with pivot but couldn't find a way how to use that for multiple columns.
Please help.

Answer 1

If it has to be dynamic, then ... it has to be dynamic, which means that PL/SQL is an option to do what you want. Here's an example:
Function that loops through all columns in a table whose name is passed as a parameter and calculates number of a value passed as the second parameter:
SQL> create or replace function f_yes_no
2 (par_table_name in varchar2, par_yes_no in varchar2)
3 return number
4 is
5 l_cnt number;
6 retval number := 0;
7 begin
8 for cur_r in (select column_name from user_tab_columns
9 where table_name = dbms_assert.sql_object_name(par_table_name)
10 and data_type like '%CHAR%'
11 )
12 loop
13 execute immediate
14 'select count(*) from ' || dbms_assert.sql_object_name(par_table_name) ||
15 ' where ' || cur_r.column_name || ' = ' ||
16 dbms_assert.enquote_literal(par_yes_no)
17 into l_cnt;
18 retval := retval + l_cnt;
19 end loop;
20 return retval;
21 end;
22 /
Function created.
SQL>
Testing: sample table:
For a sample table:
SQL> select * from test;
ZING PLING COL3 BOING
----- ----- ----- -----
Yes No Yes No
Yes No No No
No No Yes No
SQL> select f_yes_no('TEST', 'Yes') cnt_yes,
2 f_yes_no('TEST', 'No' ) cnt_no
3 from dual;
CNT_YES CNT_NO
---------- ----------
4 8
SQL>
What's nice with it? You can reuse the function for other strings in another tables, e.g. how many MANAGERs are there in Scott's EMP table?
SQL> select ename, job from emp order by job;
ENAME JOB
---------- ---------
SCOTT ANALYST
FORD ANALYST
MILLER CLERK
JAMES CLERK
SMITH CLERK
ADAMS CLERK
BLAKE MANAGER
JONES MANAGER
CLARK MANAGER
KING PRESIDENT
TURNER SALESMAN
MARTIN SALESMAN
WARD SALESMAN
ALLEN SALESMAN
14 rows selected.
SQL> select f_yes_no('EMP', 'MANAGER') cnt_mgr from dual;
CNT_MGR
----------
3
SQL>

Answer 2

The UNPIVOT clause?
SELECT
SUM(DECODE(v, 'Yes', 1)) "Yes",
SUM(DECODE(v, 'No', 1)) "No"
FROM t
UNPIVOT (
v FOR value_type IN (c1, c2, c3, c4, c5)
);
db<>fiddle
More generic way:
SELECT
SUM(DECODE(yes_no, 'Yes', 1)) "Yes",
SUM(DECODE(yes_no, 'No', 1)) "No"
FROM (
SELECT
x.yes_no.EXTRACT(c.column_name || '/text()').getStringVal() yes_no
FROM
XMLTABLE ('/ROWSET/ROW'
PASSING XMLTYPE(dbms_xmlgen.getxml('SELECT * FROM t'))
COLUMNS
yes_no XMLTYPE PATH '*[text() = ("Yes", "No")]') x
CROSS JOIN user_tab_columns c
WHERE
c.table_name = 'T' AND
column_name LIKE 'C%'
) t;
db<>fiddle
All credit must go to https://stackoverflow.com/a/45866854/3350428.

Answer 3

One method would use a lateral join:
select sum(case when col = 'Yes' then 1 else 0 end) as num_yes,
sum(case when col = 'No' then 1 else 0 end) as num_no
from t cross join lateral
(select t.column1 as col from dual union all
select t.column2 from dual union all
select t.column3 from dual union all
select t.column4 from dual union all
select t.column5 from dual
) t