DBA > Job Interview Questions > MySQL and SQL

You wrote a search engine that should retrieve 1

More DBA job interview questions and answers at http://dba.fyicenter.com/Interview-Questions/

(Continued from previous question...)

You wrote a search engine that should retrieve 10 results at a time, but at the same time you’d like to know how many rows there’re total. How do you display that to the user?

SELECT SQL_CALC_FOUND_ROWS page_title FROM web_pages LIMIT 1,10; SELECT FOUND_ROWS(); The second query (not that COUNT() is never used) will tell you how many results there’re total, so you can display a phrase "Found 13,450,600 results, displaying 1-10". Note that FOUND_ROWS does not pay attention to the LIMITs you specified and always returns the total number of rows affected by query.

(Continued on next question...)

Other Job Interview Questions