oracle - Sql query alternative way -

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i want find

select no of employees joined respect year , month employee table

my query is: 

select to_char(joining_date,'yyyy') "year",        to_char(joining_date,'mm') "month",        count(first_name)    employee  group to_char(joining_date,'yyyy'),           to_char(joining_date,'mm');

no error, runs successfully.

is there alternative way same results query?

if group year , month, can following:

select to_char(joining_date, 'mm-yyyy'), count(first_name) test_date group to_char(joining_date, 'mm-yyyy')

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