Multiple rows show in a single row using query in sql? - sql

Question

I want to display the department no. and the number of employees in each department from EMP table in a single row. I had one query which display the result in separate rows.
select deptno, count(*) from emp
group by deptno;
Dptno Count(*)
10 5
20 3
30 4
I want to display the result as a single-row. For example:
Dpt10 Count(*) Dpt20 Count(*) Dpt30 Count(*)
10 5 20 3 30 4
The output in this forum is not proper but try to understand that the no. 5,3 & 4 should be below count(*) column and 10,20 & 30 should be below deptno.

Answer 1

Since pivot doesn't support several aggregates in SQL Server:
with t as (
select 10 id, 15 su union all
select 10 id, 10 su union all
select 10 id, 5 su union all
select 20 id, 135 su union all
select 20 id, 100 su union all
select 20 id, 15 su union all
select 30 id, 150 su union all
select 30 id, 1000 su union all
select 30 id, 500 su
)
select max(case when id = 10 then id end) dept10
, count(case when id = 10 then id end) dept10_cnt
, max(case when id = 20 then id end) dept20
, count(case when id = 20 then id end) dept20_cnt
, max(case when id = 30 then id end) dept30
, count(case when id = 30 then id end) dept30_cnt
from t
SQLFiddle

Answer 2

In SQL Server, there are several ways that you can convert multiple rows of data into columns.
If you needed to just convert the count of each deptno into columns, then you could do this easily with either the PIVOT function or a CASE/aggregate combination
select
sum(case when deptno = 10 then 1 else 0 end) Count_Dpt10,
sum(case when deptno = 20 then 1 else 0 end) Count_Dpt20,
sum(case when deptno = 30 then 1 else 0 end) DCount_pt30
from emp
See Demo
But part of the problem is that you want to pivot both the DeptNo and the Total_Count into column - this would need to use 2 different aggregate functions. In your situation the PIVOT function won't work, so you'd have to use a different aggregate function along with a CASE expression similar to:
select
max(case when deptno = 10 then deptno end) Dpt10,
sum(case when deptno = 10 then 1 else 0 end) Count_Dpt10,
max(case when deptno = 20 then deptno end) Dpt20,
sum(case when deptno = 20 then 1 else 0 end) Count_Dpt20,
max(case when deptno = 30 then deptno end) Dpt30,
sum(case when deptno = 30 then 1 else 0 end) DCount_pt30
from emp;
See SQL Fiddle with Demo. Now since you have unknown departments, so you'll need use dynamic sql. This will create a sql string that will then be executed. To create the sql string you'll need to use STUFF and FOR XML PATH. The dynamic code would be:
DECLARE #cols AS NVARCHAR(MAX),
#query AS NVARCHAR(MAX)
select #cols
= STUFF((SELECT
', max(case when deptno = '+cast(deptno as varchar(10))+' then deptno end) as '+ QUOTENAME('Dpt'+cast(deptno as varchar(10)))
+ ', sum(case when deptno = '+cast(deptno as varchar(10))+' then 1 else 0 end) as '+ QUOTENAME('Count_Dpt'+cast(deptno as varchar(10)))
from emp
group by deptno
order by deptno
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set #query
= 'SELECT ' + #cols + '
from emp'
exec sp_executesql #query;
See SQL Fiddle with Demo. this gives you a result:
| DPT10 | COUNT_DPT10 | DPT20 | COUNT_DPT20 | DPT30 | COUNT_DPT30 |
|-------|-------------|-------|-------------|-------|-------------|
| 10 | 5 | 20 | 3 | 30 | 4 |

Answer 3

You can try this -
Schema
DECLARE #emp TABLE ([deptno] int NULL, [deptcount] int NULL);
INSERT #emp ([deptno], [deptcount]) VALUES (10, 5), (20, 3), (30, 4);
Query
SELECT STUFF((
SELECT ' ' + CAST([deptno] AS VARCHAR) + ' ' + CAST([deptcount] AS VARCHAR)
FROM #emp
FOR XML PATH('')
), 1, 1, '')
OutPut
10 5 20 3 30 4