显示MySQL数据库的结果数量

Question

I have a classifieds website, and it is using MySQL as a database.

My goal is to show the number of private, company and total ads in the db with the search-term entered in a text-input inside the form!

The Problem: There are two types of ads: Private, and Company. The user may specify which to display, or both, so thats three options.

On the website, after displaying the search results, I want to show the user THREE tabs: All ads, Private ads, Company ads.

I have a field in every record in MySQL which contains the value of either Private or Company.

I know of a way to display the number of private ads, company ads and TOTAL ads but it requires multiple queries.

For example, if the user CHECKS the PRIVATE ONLY check-box then only private ads are searched, but I won't know how many company ads there are until I make a new query, where I search also for company ads. Then add them, and I have also the total nr of ads.

Just wonder if you know of a good way, to maybe get rid of the extra query?

Thanks

Answer 1

You could use a ROLLUP:

SELECT
    IFNULL( field , 'All ads' ) AS 'Type',
    COUNT( * )
FROM
    `table`
GROUP BY
    field
WITH ROLLUP

So with four Company and one Private ad you would see:

Type       COUNT( * )
Company    4
Private    1
All ads    5