How can I bring the recordset count inside the same recordset?

Question

I have a query inside a procedure where I'm paging the results.
I dont know how to bring the total results inside the recordset.
How can I bring the recordset count inside the same recordset?
SELECT *
FROM ( select a.*, rownum rnum
     FROM (SELECT
          FROM table
          ORDER BY id DESC) a
     WHERE rownum <= pg*50 )
WHERE rnum > (pg-1)*50

Answer 1

My query is much more comples, so that is why I'm using the other script.
When I included the "COUNT(*) OVER() tot_cnt AS total" it didn't worked:
ORA-00904: "TOT_CNT": invalid identifier
What is the tot_cnt?
SELECT *
FROM (SELECT a.*, rownum rnum
FROM (SELECT
ed_fotos.id AS COD_FOTO,
ed_fotos.arquivo AS NOM_ARQUIVO,
ed_areas.nome AS NOM_REDACAO,
COUNT(*) OVER() tot_cnt AS total
FROM edt.ed_fotos ed_fotos
INNER JOIN edt.ed_volumes ed_volumes ON ed_volumes.id = ed_fotos.volume_id
INNER JOIN edt.ed_caminhos path_alta ON path_alta.id = ed_volumes.caminho1
INNER JOIN edt.ed_caminhos path_baixa ON path_baixa.id = ed_volumes.caminho2
INNER JOIN edt.ed_areas ed_areas ON ed_areas.id = ed_fotos.redacao_id
ORDER BY id DESC) a
WHERE rownum <= 200 )
WHERE rnum >= 100