Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
I have to compare post contents in mysql to avoid repost the same content
...WHERE not exists (SELECT 1 FROM posts p
WHERE p.content = stg.content);
I wanner to know how mysql compare two string internal, did they scan the string one character by character?
And Will this lead to some performance issue if I am about do a lot compare at a time?
Thanks very much.
do not compare post contents at mysql side, for example , if you use php, you can compute the md5 value of post contents, and save it this record into mysql, next time , if you want insert post contents into mysql, compute the md5 value and check whether it’s already save into mysql.