SQL total row count

I need to select the number of rows:

select 
    int_re_usu as Qtd_Respostas 
from 
    tb_questionario_voar_resposta  
group by 
    int_re_usu

It returns:

1- 687
2- 375076
3- 339012
4 -314083
5 -52741
6 -339977
7- 276041
8- 373304
9 - 339476
10- 51095
11- 270365
12 - 6
13 - 308670
14 -305232
15 - 85868
16 - 9893
17 -300598
18 - 300572
19 - 275889
20 - 6092
21 - 80092
22 - 307104
23 -273393

I want to select开发者_开发百科 instead the number 23,which is the total row_count.

Any ideias?

Use @@RowCount

select int_re_usu as Qtd_Respostas from tb_questionario_voar_resposta  group by int_re_usu
Select @@RowCount

OR Use a Derived Table

Select Count(*) from 
(select int_re_usu as Qtd_Respostas from tb_questionario_voar_resposta  group by int_re_usu) q1

Use COUNT():

select COUNT(*) FROM (
    SELECT int_re_usu as Qtd_Respostas 
    from tb_questionario_voar_resposta
    group by int_re_usu
)

Instead of GROUP BY, you can use DISTINCT:

SELECT COUNT(DISTINCT int_re_usu)
FROM tb_questionario_voar_resposta

select count(*) from
( select int_re_usu as Qtd_Respostas from tb_questionario_voar_resposta  group by int_re_usu ) as a

You can use the count(*) function.

select count(*) 
from table_name 
group by column_name

With temp as 
( select int_re_usu as Qtd_Respostas 
  from tb_questionario_voar_resposta  
  group by int_re_usu )

Select count(*) from temp