dealy in sql or wait in sql query

In many application or process we required dealy

there is dealy in sql server
call WAITFOR

select '1'
WAITFOR DELAY '00:00:30'

above query run and wait 30 sec for output

select '2'
WAITFOR Time '15:00'


above query run and wait for 3:00pm for output


WAITFOR gives out put after end of process if you want out put after each wait then use code as follows

select getdate()
WAITFOR DELAY '00:00:30'
Go
select getdate()
WAITFOR DELAY '00:00:30'
Go
select getdate()
Go

alternate logic for delay is while loop but its not accurate
it gives differnt interval on different configuration server.