postgresql 除法保留小数位的实例

\x
select 8/(100-3) as c1,
 round(8/(100-3) ,4) as c2,
 round(8/(100-3)::numeric ,4) as c3,
 8/(100-3)::numeric as c4
;
-[ RECORD 1 ]--------------
c1 | 0
c2 | 0.0000
c3 | 0.0825
c4 | 0.08247422680412371134
(1 row) 

SQL> select 1/2 from dual;
 1/2
----------
 .5

bill=# select 1/2;
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bill=# select 1/2::float8; 
 ?column? 
----------
 0.5
(1 row)
bill=# select 1/2::numeric; 
 ?column? 
------------------------
 0.50000000000000000000
(1 row)
bill=# select 1::money/2; 
 ?column? 
----------
 $0.50
(1 row)



以上为个人经验，希望能给大家一个参考，也希望大家多多支持。如有错误或未考虑完全的地方，望不吝赐教。