mysql - 使用 SQL 将 varchars 转换为两点十进制值

Question

我有一个包含以下金额列表的平面文件，请您告诉我，我怎样才能将下面的金额列表转换为两位十进制值，例如 1234567.80，以 {,A,H,E,C,I, F 通过使用 SQL？

12345678{
00484326A
00000210H
00000185A
00000077E
00000833C
00000255I
00000077E
00000039F
00000088A
00000000F
00000000A
00000100{  

谢谢你，

Answer 1

我把它写成一个函数是因为我认为它比内联代码更容易阅读：

create function dbo.convert_amount_str ( @amount_str varchar(50) )
returns money
as
begin
declare @char_index int
declare @amount money
declare @char varchar(50)
declare @decimal money

-- Match the first non-numeric character
select @char_index = PATINDEX('%[^0-9]%', @amount_str)

-- Get the numeric characters into a numeric variable
select @amount = convert(money, SUBSTRING(@amount_str, 0, @char_index))

-- Get the non-numeric character (will work for multiple characters)
select @char = SUBSTRING(@amount_str, @char_index, (len(@amount_str) - @char_index) + 1)

-- Convert the non-numeric characters into decimal amounts
select @decimal = case @char
    when 'A' then .8 -- whatever this should equate to
    when 'H' then .7 -- whatever this should equate to
    -- output for remaining characters
    end

return @amount + @decimal
end

然后像这样使用它：

select dbo.convert_amount_str('00484326A')

或者，更可能的是，引用包含数字字符串值的任何列。

Answer 2

试试这个 SQLfiddle。不漂亮，但它有效

SELECT 
    CAST(
        CONCAT(SUBSTRING(test_value,1, LENGTH(test_value) -2),
               '.',
               SUBSTRING(test_value, LENGTH(test_value) -1, 1))
    AS DECIMAL(7,1))
FROM TEST
WHERE SUBSTRING(test_value, LENGTH(test_value)) = 'A' 
|| SUBSTRING(test_value, LENGTH(test_value)) = 'H'
-- keep adding above line for the rest of the ending characters you want