To declare the datatype of a new column in a create table or alter table statement, use:
create table [[database.]owner.]table_name (column_name datatype [identity | not null | null] [, column_name datatype [identity | not null | null]]...)
alter table [[database.]owner.]table_name add column_name datatype [identity | null [, column_name datatype [identity | null]...
For example:
create table sales_daily (stor_id char(4)not null, ord_num numeric(10,0)identity, ord_amt money null)
You can also declare the datatype of a new column in a select into statement, use convert or cast:
select convert(double precision, x), cast ( int, y) into newtable from oldtable
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