四捨五入postgresql中的列值

Question

我想用兩位小數取整列值。

create table ABC("NUM" real);----------created table 

insert into ABC values(22.567333335555555); ---------inserted values 

但是我想這個查詢

select ROUND("NUM:,2) from ABC; 

並獲得以下錯誤消息

ERROR: function round(real, integer) does not exist 
LINE 1: select ROUND("NUM",2) from ABC; 

我想要顯示的答案應該是兩位十進制值等作爲

NUM 
----- 
22.56 

Answer 1

試試這個工作吧ng

SELECT round(CAST("NUM" as numeric), 2) FROM ABC;