12.sql

select
    l_shipmode,
    sum(
        case
            when o_orderpriority = '1-URGENT'
            or o_orderpriority = '2-HIGH' then 1
            else 0
        end
    ) as high_line_count,
    sum(
        case
            when o_orderpriority <> '1-URGENT'
            and o_orderpriority <> '2-HIGH' then 1
            else 0
        end
    ) as low_line_count
from
    orders,
    lineitem
where
    o_orderkey = l_orderkey
    and l_shipmode in ('RAIL', 'FOB')
    and l_commitdate < l_receiptdate
    and l_shipdate < l_commitdate
    and l_receiptdate >= date '1997-01-01'
    and l_receiptdate < date '1997-01-01' + interval '1' year
group by
    l_shipmode
order by
    l_shipmode;