COUNT(USER_ID) Without GROUP BY - sql

Question

Table_A Data :
NAME USER_ID V_NAME NUMBER
AUTO 1 HOME 123
CAT 2 HAT 456
DOT 3 789
FAN 4 REG
I was looking for output like
No of distinct users no.of ID's no.of V_Name no.of users with no.of
NUMBER column data users without NUMBER column data
4 4 3 3 1
Query :
SELECT
count(distinct NAME) AS No_of_Names,
count (distinct ID) AS No_of_ID,
(select count(distinct ID) from TABLE_A where NUMBER is not null) as No_of_users_with_Number_Data,
(select count(distinct ID) from TABLE_A where NUMBER is null) as No_of_users_without_Number_Data,
count (distinct V_NAME) as No_of_V_NAME FROM TABLE_A;
But with above query I am getting error :
ORA-00937: not a single-group group function.
Please help in getting the data in above format. Thanks for your help in advance

Answer 1

You can use:
SELECT COUNT(DISTINCT NAME) AS No_of_Names,
COUNT(DISTINCT ID) AS No_of_ID,
COUNT(DISTINCT V_NAME) as No_of_V_NAME,
COUNT(DISTINCT CASE WHEN "NUMBER" IS NOT NULL THEN ID END)
AS No_of_users_with_Number_Data,
COUNT(DISTINCT CASE WHEN "NUMBER" IS NULL THEN ID END)
as No_of_users_without_Number_Data
FROM table_a;
Which, for the sample data:
CREATE TABLE table_a (name, id, v_name, "NUMBER") as
SELECT 'AUTO', 1, 'HOME', 123 FROM DUAL UNION ALL
SELECT 'CAT', 2, 'HAT', 456 FROM DUAL UNION ALL
SELECT 'DOT', 3, NULL, 789 FROM DUAL UNION ALL
SELECT 'FAN', 4, 'REG' , NULL FROM DUAL;
(Note: You should not name your columns NUMBER as that is a data type.)
Outputs:
NO_OF_NAMES
NO_OF_ID
NO_OF_V_NAME
NO_OF_USERS_WITH_NUMBER_DATA
NO_OF_USERS_WITHOUT_NUMBER_DATA
4
4
3
3
1
If you then add extra rows:
INSERT INTO table_a VALUES ('DOT', 3, NULL, NULL);
INSERT INTO table_a VALUES ('FAN', 4, 'XYZ', 321);
Then the query output is:
NO_OF_NAMES
NO_OF_ID
NO_OF_V_NAME
NO_OF_USERS_WITH_NUMBER_DATA
NO_OF_USERS_WITHOUT_NUMBER_DATA
4
4
4
4
2
(Note: the output in the last two columns is a count of distinct users and not a count of rows.)
db<>fiddle here

Answer 2

Here's one option:
SQL> with table_a (name, user_id, v_name, num) as
2 (select 'auto', 1, 'home', 123 from dual union all
3 select 'cat' , 2, 'hat' , 456 from dual union all
4 select 'dot' , 3, null , 789 from dual union all
5 select 'fan' , 4, 'reg' , null from dual
6 )
7 select
8 count(distinct name) cnt_1,
9 count(distinct user_id) cnt_2,
10 sum(case when v_name is not null then 1 else 0 end) cnt_3,
11 sum(case when num is not null then 1 else 0 end) cnt_4,
12 sum(case when num is not null then 0 else 1 end) cnt_5
13 from table_a;
CNT_1 CNT_2 CNT_3 CNT_4 CNT_5
---------- ---------- ---------- ---------- ----------
4 4 3 3 1
SQL>