不会写 TO_NUMBER

Question

我将数字保存在 table 中作为字符串，例如

25758313,1
200000000
1418213,04

我知道有 1) 总是没有组分隔符； 2) 如果需要，逗号作为小数点分隔符； 3) 不超过 2 个十进制字符。

尝试使用定义为 to_number(string_val) 的列创建视图，但可以编写正确的表达式。

Answer 1

manual page for TO_NUMBER() 有一个你可以改编的例子：

The 'nlsparam' argument in this function has the same purpose as it does in the TO_CHAR function for number conversions.
SELECT TO_NUMBER('-AusDollars100','L9G999D99',
   ' NLS_NUMERIC_CHARACTERS = '',.''
     NLS_CURRENCY            = ''AusDollars''
   ') "Amount"
     FROM DUAL;

可能是这样的：

WITH data AS (
    SELECT '25758313,1' AS original_text FROM DUAL
    UNION ALL SELECT '200000000' FROM DUAL
    UNION ALL SELECT '1418213,04' FROM DUAL
)
SELECT original_text,
TO_NUMBER(original_text, '999999999999D999999999999', 'NLS_NUMERIC_CHARACTERS = '',.''') AS parsed_number
FROM data;

ORIGINAL_T PARSED_NUMBER
---------- -------------
25758313,1    25758313.1
200000000      200000000
1418213,04    1418213.04

不会写 TO_NUMBER

Can't write TO_NUMBER

oracle

oracle11g

string-conversion