Query to find the duplicates between the name and number in table - mysql

Question

SELECT count(*), lower(name), number
FROM tbl
GROUP BY lower(name), number
HAVING count(*) > 1;
input tb1
slno name number
1 aaa 111
2 Aaa 111
3 abb 221
4 Abb 121
5 cca 131
6 cca 141
7 abc 222
8 cse 222
This query can just find the duplicates in the number and names which are same but it wont be able find the duplicates in the 3 and 4th row!!!
SELECT count(*), lower(name)
FROM tbl
GROUP BY lower(name)
HAVING count(lower(name)) > 1
this query can find all the duplicates in name!!! it works perfectly
SELECT count(*), number
FROM tbl
GROUP BY number
HAVING count(number) > 1
this query can find all the duplicates in number!!! it works perfectly
I want a query which can find all the duplicates in both name and number whether the name consists of lower case and upper case
output
name number count
2 111 aaa
2 --- abb
2 --- cca
2 222 ---

Answer 1

Updated question
"Get duplicate on both number and name" ... "name and number as different column"
Rows can be counted twice here!
SELECT lower(name), NULL AS number, count(*) AS ct
FROM tbl
GROUP BY lower(name)
HAVING count(*) > 1
UNION ALL
SELECT NULL, number, count(*) AS ct
FROM tbl
GROUP BY number
HAVING count(*) > 1;
-> sqlfiddle
Original question
The problem is that the query groups by
GROUP BY lower(name), number
As row 3 and 4 have a different number, they are not the same for this query.
If you want to ignore different numbers for this query, try something like:
SELECT lower(name)
, count(*) AS ct
FROM tbl
GROUP BY lower(name)
HAVING count(*) > 1;

Answer 2

With a little work we can show counts for both name and number in one column:
select NameOrNumber, count(*) as Count
from (
select name as NameOrNumber from tb1
union all
select number from tb1
) a
group by NameOrNumber
having count(NameOrNumber) > 1
SQL Fiddle Example #1
Output #1:
| NAMEORNUMBER | COUNT |
------------------------
| 111 | 2 |
| aaa | 2 |
| abb | 2 |
| cca | 2 |
If you want the output in separate columns, you can do something like this:
select distinct if(t1.name = t2.name, t1.name, null) as DUPLICATE_Name,
if(t1.number = t2.number, t1.number, null) as DUPLICATE_Number
from tb1 t1
inner join tb1 t2 on (t1.name = t2.name or t1.number = t2.number)
and t1.slno <> t2.slno
SQL Fiddle Example #2
Output #2:
| DUPLICATE_NAME | DUPLICATE_NUMBER |
-------------------------------------
| Aaa | 111 |
| Abb | (null) |
| cca | (null) |