四舍五入高达9位小数

Question

我有一个程序，我设置的值作为

DECLARE V_FACTOR DECIMAL(14,9); 

SET V_FACTOR = ROUND((73108997572.52/69453547621393.89),9); 

应该给我像0.001052632的值，但其付出的0.00105

Answer 1

我跑了下面的测试。

创建一个源文件round.sql。

--#SET TERMINATOR @ 
connect to pocdb@ 

values (ROUND((73108997572.52/69453547621393.89),9))@ 

create or replace procedure stack.round_proc(out r decimal(14,9)) 
language sql 
begin 
    declare r1 decimal(14,9); 
    set r = ROUND((73108997572.52/69453547621393.89),9); 
end 
@ 

create or replace function stack.round_func() 
returns decimal(14,9) 
language sql 
begin atomic 
    declare r1 decimal(14,9); 
    set r1 = ROUND((73108997572.52/69453547621393.89),9); 
    return r1; 
end 
@ 

call stack.round_proc(?)@ 

values (stack.round_func())@ 

connect reset@ 
terminate@ 

执行的源文件，使用：

db2 -tvf round.sql > round.out 2>&1 

结果round.out捕获：

connect to pocdb 

    Database Connection Information 

Database server  = DB2/LINUXX8664 10.5.3 
SQL authorization ID = DB2INST1 
Local database alias = POCDB 


values (ROUND((73108997572.52/69453547621393.89),9)) 

1 
--------------------------------- 
      0.001052632000000000 

    1 record(s) selected. 


create or replace procedure stack.round_proc(out r decimal(14,9)) 
language sql 
begin 
    declare r1 decimal(14,9); 
    set r = ROUND((73108997572.52/69453547621393.89),9); 
end 

DB20000I The SQL command completed successfully. 

create or replace function stack.round_func() 
returns decimal(14,9) 
language sql 
begin atomic 
    declare r1 decimal(14,9); 
    set r1 = ROUND((73108997572.52/69453547621393.89),9); 
    return r1; 
end 

DB20000I The SQL command completed successfully. 

call stack.round_proc(?) 

    Value of output parameters 
    -------------------------- 
    Parameter Name : R 
    Parameter Value : 0.001052632 

    Return Status = 0 

values (stack.round_func()) 

1 
---------------- 
    0.001052632 

    1 record(s) selected. 


connect reset 
DB20000I The SQL command completed successfully. 

terminate 
DB20000I The TERMINATE command completed successfully. 

如果您收到的结果是不同的，你应该打开一个PMR。