能否在一定程度上缩小一个表的两行之间的差别?
我试图这样做,但努力工作:
$diff = mysql_num_rows("
SELECT (`used`-`paid`)
FROM `coupons_codes`
WHERE `cid`= ".$data[ cid ]." ");
能否在一定程度上缩小一个表的两行之间的差别?
我试图这样做,但努力工作:
$diff = mysql_num_rows("
SELECT (`used`-`paid`)
FROM `coupons_codes`
WHERE `cid`= ".$data[ cid ]." ");
你应该这样做:
//store the query in a string
$query = "SELECT `used`-`paid` FROM `coupons_codes` WHERE `cid`= ".$data[ cid ]." ";
//execute the query on the MySQL database
$result = mysql_query($query);
//extract the result from the response from the MySQL server
$diff = mysql_result($result, 0, 0);
您重新使用的功能用于计算从<条码>米sql_query(>);条码(>)查询中获取的分行数。
我建议你努力阅读有关公共卫生和社会福利部和我SQL的一些基本内容,我感到,你缺乏一些基本知识,无法真正制定良好的守则。
I noticed that there were some threads with similar questions, and I did look through them but did not really get a convincing answer. Here s my question: The subquery below returns a Table with 3 ...
<?php $con=mysql_connect("localhost","mts","mts"); if(!con) { die( unable to connect . mysql_error()); } mysql_select_db("mts",$con); /* date_default_timezone_set ("Asia/Calcutta"); $date = ...
我把我的用心从使用QQL转向MySQL。 它与凯科特合作,现在不工作,因为我已经改变,使用MySQL。 这里的错误信息是:
We have a restaurant table that has lat-long data for each row. We need to write a query that performs a search to find all restaurants within the provided radius e.g. 1 mile, 5 miles etc. We have ...
Is it possible in php to return a specific row of data from a mysql query? None of the fetch statements that I ve found return a 2 dimensional array to access specific rows. I want to be able to ...
Our website was developed with a meta tag set to... <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /> This works fine for M-dashes and special quotes, etc. However, I ...
What are some of the strategies being used for pagination of data sets that involve complex queries? count(*) takes ~1.5 sec so we don t want to hit the DB for every page view. Currently there are ~...
My table looks like person_id | car_id | miles ------------------------------ 1 | 1 | 100 1 | 2 | 200 2 | 3 | 1000 2 | 4 | 500 I need to ...