How can I use pick and match for the following expression

[aarav021]

((count({<hospital_name={'xyz'}>}hospital_name)-
count({1}if(MONTH=monthname(monthname(MONTH)-1) and hospital_name='xyz',hospital_name)))/
count({1}if(MONTH=monthname(monthname(MONTH)-1) and hospital_name='xyz',hospital_name)))

[ajaykakkar93]

hi,

can you share a proper example