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    <h2>Getting total rows in a query result...</h2> <p>You could just iterate the result and count them. You don't say what language or client library you are using, but the API does provide a <a href="http://dev.mysql.com/doc/refman/5.0/en/mysql-num-rows.html" rel="noreferrer">mysql_num_rows</a> function which can tell you the number of rows in a result.</p> <p>This is exposed in PHP, for example, as the <a href="http://php.net/manual/en/mysqli-result.num-rows.php" rel="noreferrer">mysqli_num_rows</a> function. As you've edited the question to mention you're using PHP, here's a simple example using mysqli functions:</p> <pre><code>$link = mysqli_connect("localhost", "user", "password", "database"); $result = mysqli_query($link, "SELECT * FROM table1"); $num_rows = mysqli_num_rows($result); echo "$num_rows Rows\n"; </code></pre> <h2>Getting a count of rows matching some criteria...</h2> <p>Just use COUNT(*) - see <a href="http://dev.mysql.com/doc/refman/5.0/en/counting-rows.html" rel="noreferrer">Counting Rows</a> in the MySQL manual. For example:</p> <pre><code>SELECT COUNT(*) FROM foo WHERE bar= 'value'; </code></pre> <h2>Get total rows when LIMIT is used...</h2> <p>If you'd used a LIMIT clause but want to know how many rows you'd get without it, use <a href="http://dev.mysql.com/doc/refman/5.0/en/select.html#id959825" rel="noreferrer">SQL_CALC_FOUND_ROWS</a> in your query, followed by SELECT <a href="http://dev.mysql.com/doc/refman/5.0/en/information-functions.html#function_found-rows" rel="noreferrer">FOUND_ROWS();</a></p> <pre><code>SELECT SQL_CALC_FOUND_ROWS * FROM foo WHERE bar="value" LIMIT 10; SELECT FOUND_ROWS(); </code></pre> <p>For very large tables, this isn't going to be particularly efficient, and you're better off running a simpler query to obtain a count and caching it before running your queries to get pages of data.</p>
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    1. POHow can I count the numbers of rows that a mysql query returned?
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    1. USPaul Dixon
    1. USPaul Dixon
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    1. POHow can I count the numbers of rows that a mysql query returned?
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    1. CO+1 much more complete than my answer. I'm removing mine.
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      1. USPaolo Bergantino
    2. CO+1 for including SQL_CALC_FOUND_ROWS and the proper context to use it in
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      1. USrobmerica
    3. CO-1 SQL CALC FOUND ROWS is a VERY demanding operation. This should be avoided. and can be avoided by creating the same query as before, only selecting the ID and not *. Also select * should be avoided as well... view here: http://www.parseerror.com/sql/select*isevil.html
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      1. USPetrogad
 

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