oracle的TO_NUMBER函数

时间:2016-06-14 13:41:13   收藏:0   阅读:4614

TO_NUMBER(x [, format], [ nls_language ]) converts x to a NUMBER.

Number Format Elements:

ElementExampleDescription
, . 1,234.56 Commas and decimal points  逗号和小数点
$ $123.45 Leading dollar sign. 前置$符号
0 0012.34 Leading or trailing 0. 前置或后置0
9 123 Any digit. 任意数字
B B123 Leading blank for integers. integer类型前置空白符
C C123 The ISO currency symbol defined in the NLS_ISO_CURRENCY parameter.定义在NLS_ISO_CURRENCY参数中的国际标准货币符号
D 123D99 The current decimal character defined in the NLS_NUMERIC_CHARACTERS parameter. The default value is a period.
EEEE 1.2EEE Returns a value in scientific notation.用科学计数法表示返回值
G 9G123 Returns the group separator (e.g., a comma).
L L123 Returns the local currency symbol.
MI 123MI negative value with trailing minus sign; returns positive value with a trailing blank.
PR 123PR The negative values in angle brackets.
RN I values in Roman numerals, uppercase.
rn i values in Roman numerals, lowercase.
S (prefix) S1234 negative values with a leading minus sign, positive values with a leading positive sign.
S (suffix) 1234S negative values with a trailing minus sign, positive values with a trailing positive sign.
TM TM The text minimum number format model returns the smallest number of characters possible.
U U123 the Euro currency symbol or the NLS_DUAL_CURRENCY parameter.
V 123V99 a value multiplied by 10n, where n is the number of 9s after the V.
X XXXX the hexadecimal value.十六进制值

SQL> select to_number(‘123.45‘) from dual;

TO_NUMBER(‘123.45‘)
-------------------
             123.45

SQL> select to_number(‘123.45‘, ‘9999.99‘) from dual;

TO_NUMBER(‘123.45‘,‘9999.99‘)
-----------------------------
                       123.45

SQL> select to_number(‘12‘, ‘99‘) from dual;

TO_NUMBER(‘12‘,‘99‘)
--------------------
                  12

SELECT TO_NUMBER(‘$12,123.23‘,‘$999,999.99‘) FROM DUAL;

SQL>
SQL>
SQL>
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Do calculation after the conversion


SQL> select to_number(‘123.45‘) + 2 from dual;

TO_NUMBER(‘123.45‘)+2
---------------------
               125.45

SQL> SELECT TO_NUMBER(‘-$12,345.67‘, ‘$99,999.99‘) FROM dual;

TO_NUMBER(‘-$12,345.67‘,‘$99,999.99‘)
-------------------------------------
                            -12345.67

SQL>
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