How to count null values with non null values.

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I want to write query to getting count of values (including nuu values) using group by...

see below example.

Emp_Id EmpName Marks
101 A 90
101 A 85
101 NULL 89
102 B 90
102 B 85
102 B 89
102 NULL 89
103 C 90
103 C 85
103 C 89
103 C 89
103 NULL 90

i want to get the count of 101,102,103.

for example, 101 -> 3 (including null)

102 -> 4 (inluding null)

103 -> 5 (including null)

How to write count query using group by

Posted 2-Apr-12 23:07pm

gani7787

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bhagirathimfs · Accepted Answer · 2012-04-02T23:16:00

Solution 1

SELECT EMP_ID,COUNT(EMP_ID) FROM EMP GROUP BY EMP_ID;

This will show the emp_id and the no of records present for that emp_id.

Posted 2-Apr-12 23:16pm

bhagirathimfs

Comments

gani7787 3-Apr-12 6:31am

no..it's not working.

it will come as below.

Emp_id Name Tot Count
101 NULL 1
101 A 2
102 NULL 1
102 B 3
103 NULL 1
103 C 4

But, i want 101 --> 2+1 = 3

102 --> 3+1 = 4

103 --> 4+1 = 5

like below o/p..

Emp_id Name Tot Count
101 A 3
102 B 4
103 C 5

bhagirathimfs 3-Apr-12 8:07am

SELECT EMP_ID,EMP_NAME AS NAME,COUNT(EMP_ID) AS TOTAL FROM EMP GROUP BY EMP_ID;

If u write the above code than it will show
emp_id name total
101 A 3
102 B 4
103 C 5

If u write
SELECT EMP_ID,EMP_NAME AS NAME,COUNT(EMP_ID) AS TOTAL FROM EMP GROUP BY EMP_ID,NAME;

than this will show
emp_id name total
101 A 2
101 null 1
102 B 3
102 null 1
103 C 4
103 null 1

So please group by only emp_id