Convert text to float, when text comes in different formats - mysql

Question

I want to store a text as a float. My problem is, that this text comes in different formats , and I cannot influence that. My TEXT column contains strings like
357000
218000.56
500.000.00
I don't have a problem converting the first two strings. I DO have a problem converting the last one, because the decimal mark is the same character as the thousands separator.
How should I deal with this problem? Is there an explicit conversion string-to-float using a format I can define?
EDIT: I forgot to say, that in the above cases, the last . (if there is any) is always the decimal separator if it is followed by a two digits number. So, '153.650' should convert to 153650 for example.

Answer 1

"EDIT: I forgot to say, that in the above cases, the last . (if there is any) is always the >decimal separator if it is followed by a two digits number. So, '153.650' should convert to >153650 for example."
There's your answer.
Check if the character at index (yourString.Length - 3) is one of your delimiters. If it is, then you have a decimal value; if not, you don't. Proceed to strip out all extraneous symbols and then re-insert your choice of decimal separator at the correct index.
Clean? No. But the situation stinks, TBH.

Answer 2

Correct the data before giving them to SQL - a programming language is simpler, for instance using regular expression replace.
s = s.replaceAll("\\D(\\d\\d\\d)", "$1").replaceFirst("\\D". ".");
(Which does not consider signs!)
It first removes non-digits followed by three digits, and then make a period out of the first remaining non-digit. Can be done smarter.
The above is Java, but regex exists in all sensible programming languages.

Answer 3

you can try this
CONVERT(
REPLACE(REPLACE(value, '.', ''), ',', '.'),
DECIMAL(10,2))
this will replace . and, from your string and will convert it into decimal (10,2).
According To Your
SELECT
IF(
LENGTH(
SUBSTRING_INDEX('351.000', '.', - 1)
) >= "3",
CONVERT(
REPLACE("351.000", ".", ''),
DECIMAL (10, 2)
),
CONVERT(
CONCAT(
REPLACE(
LEFT(
'351.000',
LENGTH("351.000") - LOCATE('.', REVERSE("351.000"))
),
'.',
''
),
CONCAT(
".",
SUBSTRING_INDEX('351.000', '.', - 1)
)
),
DECIMAL (10, 2)
)
)
I have tried for
1234.56 gives 1234.56
1234.000.00 gives 1234000.00
and 1234.000 gives 1234000
but it is not a good way to do so much in mysql query. you should handle it in programming part

Answer 4

SQL Fiddle
MySQL 5.5.32 Schema Setup:
CREATE TABLE Table1
(`TEXT` varchar(10))
;
INSERT INTO Table1
(`TEXT`)
VALUES
('357000'),
('218000.56'),
('500.000.00')
;
Query 1:
SELECT CAST(concat(
REPLACE(CASE WHEN substr(TEXT,-3,1) = "." THEN substr(TEXT,1,length(TEXT)-3)
ELSE TEXT END,'.',''),
CASE WHEN substr(TEXT,-3,1) = "." THEN right(TEXT,3)
ELSE '' END) AS decimal(12,2)
) AS Amount
FROM Table1
Results:
| AMOUNT |
|-----------|
| 357000 |
| 218000.56 |
| 500000 |