在SQL数据库上整理手机号码

Question

All the mobile numbers have gone into the format 447XXXXXXXX, I would like the numbers to be in the format of 07XXXXXXXXXX.

I was going to try the following query:

UPDATE stack
SET Telephone= REPLACE(Telephone,'447','07')

However, if a number contains 447 this will also be replaced, I was thinking to use wildcards to replace just the first two 4's of every column. How would be the best way to update all 49,000 entries, I have created a backup just in case.

UPDATE

It seems the numbers were set in the wrong format so the following query was used to put them in the correct format:

ALTER TABLE stack ALTER COLUMN Telephone VARCHAR(15)

Now ALL the numbers are showing up in a weird format: 4.47944e+011

Answer 1

Change your data type to varchar (number data types don't store leading zeros). To do that you need to change it to bigint first, to make the conversion work:

ALTER TABLE your_table ALTER COLUMN Telephone BIGINT;
ALTER TABLE your_table ALTER COLUMN Telephone VARCHAR(15);

After that you can change your data like this

UPDATE your_table
SET Telephone = '07' + substring(Telephone, 4,99)
WHERE charindex('447', Telephone) = 1

SQLFiddle demo

Answer 2

Maybe change the source (and avoid conversion requirements in future?):

=IF(LEFT(A1,2)="44",0&MID(A1,3,15),LEFT(A1,15))  

This results in a string.

Answer 3

Following should work. I gave an example as well... You need to only use the UPDATE statement...

DECLARE @Telephone TABLE(Telephone VARCHAR(100))

INSERT INTO @Telephone 
SELECT '44712345' UNION ALL
SELECT '123447' UNION ALL
SELECT '447123447' 

SELECT *
FROM @Telephone

UPDATE @Telephone
SET Telephone = STUFF(Telephone, 1, 3, '07')
WHERE (charindex('447', Telephone) = 1)

SELECT *
FROM @Telephone

Answer 4

1) Phone number are stored (usually) using a VARCHAR column.

2) Assuming that the old Telephone column was a FLOAT column, if you Telehone column (now a VARCHAR(15) column) has values like '4.47944e+011' then you need to convert these values back to FLOAT and then you have to use STR to convert FLOAT values to VARCHAR. For example, following script

DECLARE @PhoneFromFloat VARCHAR(15) = '4.47944e+011'
SELECT STR(CONVERT(FLOAT, @PhoneFromFloat), 15, 0)

outputs: 447944000000 .

To execute this update you could use this script:

BEGIN TRANSACTION;

UPDATE  dbo.Stack
SET     Telephone = STR(CONVERT(FLOAT, Telephone), 15, 0)
OUTPUT  deleted.Telephone, inserted.Telephone -- This clause will show affected phone numbers
WHERE   Telephone LIKE '%e%';

ROLLBACK;
-- COMMIT

Note: you could avoid these problems if you import phone numbers into a VARCHAR column directly and not into a FLOAT column.

3) Then you could use:

BEGIN TRANSACTION;

UPDATE  dbo.Stack
SET Telephone = STUFF(Telephone, 1, 2, '0')
WHERE   Telephone LIKE '447%';

ROLLBACK;
-- COMMIT

Note: you could do this replace in Excel using, of course, Excel functions.