varchar to money

-- setup test table with bad data, blanks, scientific value, null
create table #t2 (vcm varchar(30))
insert #t2 values ('bad')
insert #t2 values ('1e2')
insert #t2 values ('1.2')
insert #t2 values ('1.22222222')
insert #t2 values ('123')
insert #t2 values ('b123')
insert #t2 values ('b123')
insert #t2 values ('')
insert #t2 values (null)

-- your 3-statement script
update #t2 set vcm = null where ISNUMERIC(vcm)<>1
update #t2 set vcm = CONVERT(varchar(30), convert(float, vcm))
alter table #t2 alter column vcm money

-- verify results
select * from #t2

alter table #t2 alter column vcm money

would this work for existing table


would this create error for existing values

thanks