Hur visar man det totala antalet för den sista raden efter filstatus?

Använd en korrelerad underfråga:

SELECT COUNT(DISTINCT f_bankid) AS tcount
FROM tbl_fileStatus t
WHERE ? = (SELECT f_filestatus FROM tbl_fileStatus WHERE f_bankid = t.f_bankid ORDER BY f_id DESC LIMIT 1)

Byt ut ? med f_bankid du söker efter.
Se demon .

I MySql 8.0+ kan du använda FIRST_VALUE() fönsterfunktion:

SELECT COUNT(*) AS tcount
FROM (
  SELECT DISTINCT f_bankid, 
         FIRST_VALUE(f_filestatus) OVER (PARTITION BY f_bankid ORDER BY f_id DESC) f_filestatus
  FROM tbl_fileStatus
) t
WHERE f_filestatus = ?

Se demon .

Om du vill ha resultat för alla f_filestatus i 1 rad:

SELECT
  SUM(f_filestatus = 1) AS tcount1,
  SUM(f_filestatus = 2) AS tcount2,
  SUM(f_filestatus = 3) AS tcount3
FROM (
  SELECT t.f_bankid, t.f_filestatus
  FROM tbl_fileStatus t
  WHERE t.f_id = (SELECT f_id FROM tbl_fileStatus WHERE f_bankid = t.f_bankid ORDER BY f_id DESC LIMIT 1)
) t

Se demon .
Resultat:

> tcount1 | tcount2 | tcount3
> ------: | ------: | ------:
>       0 |       1 |       2