1. Oracle

Alibaba-inc

2010-05

http://blog.csdn.net/yzsind

2.

(NUMBER)

(STRING)

(DATETIME)

(LOB)

3.

NUMBER(p,s)

p:+ 1-38

s:-47-127

Number(6,2)6422

Number(6,-2)???

Number(1,-2)??? 949,950

DATA_LENGTH===22???

4. Number

1-21

01(0x80)

12(0xC1,0x02)

-13(0x3E,0x64,0x66)

SQL> select dump(123456789,16) from dual;

DUMP(123456789,16)

-----------------------------

Typ=2 Len=6: c5,2,18,2e,44,5a

5. unDumpNumber

if Bytes(0) = 128 then --1280

result := 0;

elsif Bytes(0) > 128 then --128

for i in 1 .. vlength - 1 loop

result := result +

(Bytes(i) - 1) * power(100, (Bytes(0) - 193) - i+1);

end loop;

else --128

for i in 1 .. vlength - 2 loop --102

result := result +

(Bytes(i) - 101) * power(100, (62 - Bytes(0)) - i+1);

end loop;

end if;

return(Result);

6. (10g)

BINARY_FLOAT

4

BINARY_DOUBLE

8

7. Number VS Binary_Float

insert into t(c_number,c_float) select rownum/100,rownum/100 from dual connect by rownum

總結

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