oracle中的rownum如何轉換成postgresql的sql

blackcat242

select
l_returnflag,
l_linestatus,
sum(l_quantity) as sum_qty,
sum(l_extendedprice) as sum_base_price,
sum(l_extendedprice * (1 - l_discount)) as sum_disc_price,
sum(l_extendedprice * (1 - l_discount) * (1 + l_tax)) as sum_charge,
avg(l_quantity) as avg_qty,
avg(l_extendedprice) as avg_price,
avg(l_discount) as avg_disc,
count(*) as count_order
from
lineitem
where
l_shipdate <= date '1998-12-01' - interval '94' day (3)
group by
l_returnflag,
l_linestatus
order by
l_returnflag,
l_linestatus;
where rownum <= -1;

上面是oracle中的一個sql語句，最后面的rownum<=-1的意思，baidu了一下，意思是執(zhí)行查詢，但是最后的結果不打印。

在postgresql中有沒有類似的語法呢？我試過limit，但是使用limit 0后，連查詢都不執(zhí)行了。達不到效果。

skykiker

select * from(select row_number() over() as rownum,* from tb1) tbx where rownum<=-1;