Solved

sql state ment to select the row that not is email address in mysql

Posted on 2011-02-12
2
268 Views
Last Modified: 2012-05-11
I have a column email (varchar)
how can I select  rows that column "email" is not email
0
Comment
Question by:teera
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
2 Comments
 
LVL 3

Accepted Solution

by:
sunezapa earned 500 total points
ID: 34881101
I would consider to do the check in frontend code.

But by SQL you can check some elements of "valid email"-rules, here I found example:

--No embedded spaces
- '@' can't be the first character of an email address
- '.' can't be the last character of an email address
- There must be a '.' somewhere after '@'
- the '@' sign is allowed
- Domain name should end with at least 2 character extension
- can't have patterns like '.@' and '..'

SELECT email_address WHERE NOT (
     CHARINDEX(' ',LTRIM(RTRIM(@email_address))) = 0 
AND  LEFT(LTRIM(@email_address),1) <> '@' 
AND  RIGHT(RTRIM(@email_address),1) <> '.' 
AND  CHARINDEX('.',@email_address ,CHARINDEX('@',@email_address)) - CHARINDEX('@',@email_address ) > 1 
AND  LEN(LTRIM(RTRIM(@email_address ))) - LEN(REPLACE(LTRIM(RTRIM(@email_address)),'@','')) = 1 
AND  CHARINDEX('.',REVERSE(LTRIM(RTRIM(@email_address)))) >= 3 
AND  (CHARINDEX('.@',@email_address ) = 0 AND CHARINDEX('..',@email_address ) = 0)
)

Open in new window


0
 
LVL 15

Expert Comment

by:Jagadishwor Dulal
ID: 34882139
Fetch your row and check the fetched record is valid email or not.
0

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

'Between' is such a common word we rarely think about it but in SQL it has a very specific definition we should be aware of. While most database vendors will have their own unique phrases to describe it (see references at end) the concept in common …
If you find yourself in this situation “I have used SELECT DISTINCT but I’m getting duplicates” then I'm sorry to say you are using the wrong SQL technique as it only does one thing which is: produces whole rows that are unique. If the results you a…
Finds all prime numbers in a range requested and places them in a public primes() array. I've demostrated a template size of 30 (2 * 3 * 5) but larger templates can be built such 210  (2 * 3 * 5 * 7) or 2310  (2 * 3 * 5 * 7 * 11). The larger templa…
Are you ready to implement Active Directory best practices without reading 300+ pages? You're in luck. In this webinar hosted by Skyport Systems, you gain insight into Microsoft's latest comprehensive guide, with tips on the best and easiest way…

734 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question