select dynamic database

Question

hi team,

 

how to select dynamic database.

e.g 

 

select top 10 * from ELCM_mahsqa.tna.rostering 

 

my query is that how to change  'mahsqa'  dynamically

 

suppose client name is abc then i want o/p like

 

select top 10 * from ELCM_abc.tna.rostering