If I have this:
$results = mysql_query(“SELECT * FROM table_name WHERE id=$id”);
is there then any way to check how many rows which have a field-value of “Private” or “Company” ?
I need to show the user how many “Private” and “Company” records where found, without making another query. (There is a column called ‘ad_type’ which contains either “private” or “company”)
I already know the mysql_num_rows for counting all rows!
EDIT:
There are 500thousand records! So maybe an iteration through the result is slow, what do you think?
Thanks for all help 🙂
解决方案
The above answers are great and all, but the currently checked answer will work very inefficiently should you be dealing with a large amount of data
Example of the above answer (via Gal)
$results = mysql_query(“SELECT *,(SELECT COUNT(*) FROM table_name WHERE column=$value) count FROM table_name WHERE id=$id”);
It’s good and all, and it returns what you need but the obvious design flaw is that making your SQL server return the results then re-return them and look at just the count is very inefficient for large amounts of data.
Simply do this:
$results = mysql_query(“SELECT * FROM table_name WHERE column=$value”);
$num_rows = mysql_num_rows($result);
It will yield the same results and be much more efficient in the long run, additionally for larger amounts of data.