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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中的一个sql语句,最后面的rownum<=-1的意思,baidu了一下,意思是执行查询,但是最后的结果不打印。
在postgresql中有没有类似的语法呢?我试过limit,但是使用limit 0后,连查询都不执行了。达不到效果。 |
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