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 was wondering if to use 2 tables is better then using 1 single table .
Scenario:
i have a simple user table and a simple user_details table. i can JOIN tables and select both records.
But i was wondering if to merge 2 table into 1 single table.
what if i have 2milions users records in both tables?
in terms of speed and exec time is better to have a single table when selecting records?
You should easily be able to make either scenario perform well with proper indexing. Two million rows is not that many for any modern RDBMS.
However, one table is a better design if rows in the two tables represent the same logical entity. If the user table has a 1:1 relationship with the user_detail table, you should (probably) combine them.
Edit: A few other answers have mentioned de-normalizing–this assumes the relationship between the tables is 1:n (I read your question to mean the relationship was 1:1). If the relationship is indeed 1:n, you absolutely want to keep them as two tables.