对不起，我想重复一下这个问题，因为我觉得你不清楚，我这样做很难得到我想要的东西。
我想从单个查询中得到三个表格的总和，这是我的表格!!
1：付款
id | school_fee | trans_fee
1 20000 3000
2 10000 2000
The total is 35000
，代码在这里
<?php
//mysql_connect
if (isset($_GET['query']))
{
$query=$_GET['query'];
// Instructions if $_POST['value'] exist
}
// gets value sent over search form
$min_length = 3;
// you can set minimum length of the query if you want
if(strlen($query) >= $min_length){ // if query length is more or equal minimum
length then
$query = htmlspecialchars($query);
// changes characters used in html to their equivalents, for example: < to >
$query = mysql_real_escape_string($query);
// makes sure nobody uses SQL injection
$raw_results = mysql_query("SELECT SUM(school_fee+trans_fee) As Total
FROM payment WHERE (`class` LIKE '%".$query."%')") or die(mysql_error());
// * means that it selects all fields, you can also write: `id`,
`title`, `text`
// articles is the name of our table
// '%$query%' is what we're looking for, % means anything, for example
if
$query
is Hello
// it will match "hello", "Hello man", "gogohello", if you want exact match use
`title`='$query'
// or if you want to match just full word so "gogohello" is out use '% $query %'
...OR ... '$query %' ... OR ... '% $query'
if(mysql_num_rows($raw_results) > 0){
// if one or more rows are returned do following
while($results = mysql_fetch_array($raw_results)){
while($results2 = mysql_fetch_array($raw_results2)){
//
$results = mysql_fetch_array($raw_results) puts data from database into
array, while it's valid it does the loop
// posts results gotten from database(title and text) you can also show
id ($results['id'])
}{
echo " Total amount of money payed by "
.$results['class'] ." "."class is " . $results ['Total'] .
" /=Tshs";
echo"<br>"; echo"<br>";
}
}
}
}
?>
2：payment_one
id | school_fee | trans_fee
1 10000 20000
2 30000 50000
The Total is 110000
除表的名称外，CODE与第一个表相同 这里是代码
<?php
//mysql_connect
if (isset($_GET['query']))
{
$query=$_GET['query'];
// Instructions if $_POST['value'] exist
}
// gets value sent over search form
$min_length = 3;
// you can set minimum length of the query if you want
if(strlen($query) >= $min_length){ // if query length is more or equal minimum
length then
$query = htmlspecialchars($query);
// changes characters used in html to their equivalents, for example: < to >
$query = mysql_real_escape_string($query);
// makes sure nobody uses SQL injection
$raw_results = mysql_query("SELECT SUM(school_fee+trans_fee) As Total
FROM payment_one WHERE (`class` LIKE '%".$query."%')") or die(mysql_error());
// * means that it selects all fields, you can also write: `id`,
`title`, `text`
// articles is the name of our table
// '%$query%' is what we're looking for, % means anything, for example
if
$query
is Hello
// it will match "hello", "Hello man", "gogohello", if you want exact match use
`title`='$query'
// or if you want to match just full word so "gogohello" is out use '% $query %'
...OR ... '$query %' ... OR ... '% $query'
if(mysql_num_rows($raw_results) > 0){
// if one or more rows are returned do following
while($results = mysql_fetch_array($raw_results)){
while($results2 = mysql_fetch_array($raw_results2)){
//
$results = mysql_fetch_array($raw_results) puts data from database into
array, while it's valid it does the loop
// posts results gotten from database(title and text) you can also show
id ($results['id'])
}{
echo " Total amount of money payed by "
.$results['class'] ." "."class is " . $results ['Total'] .
" /=Tshs";
echo"<br>"; echo"<br>";
}
}
}
}
?>
最后一个是
3：payment_two
id | school_fee | trans_fee
1 10000 20000
2 30000 10000
The Total is 70000
代码如下
<?php
//mysql_connect
if (isset($_GET['query']))
{
$query=$_GET['query'];
// Instructions if $_POST['value'] exist
}
// gets value sent over search form
$min_length = 3;
// you can set minimum length of the query if you want
if(strlen($query) >= $min_length){ // if query length is more or equal minimum
length then
$query = htmlspecialchars($query);
// changes characters used in html to their equivalents, for example: < to >
$query = mysql_real_escape_string($query);
// makes sure nobody uses SQL injection
$raw_results = mysql_query("SELECT SUM(school_fee+trans_fee) As Total
FROM payment_two WHERE (`class` LIKE '%".$query."%')") or die(mysql_error());
// * means that it selects all fields, you can also write: `id`,
`title`, `text`
// articles is the name of our table
// '%$query%' is what we're looking for, % means anything, for example
if
$query
is Hello
// it will match "hello", "Hello man", "gogohello", if you want exact match use
`title`='$query'
// or if you want to match just full word so "gogohello" is out use '% $query %'
...OR ... '$query %' ... OR ... '% $query'
if(mysql_num_rows($raw_results) > 0){
// if one or more rows are returned do following
while($results = mysql_fetch_array($raw_results)){
while($results2 = mysql_fetch_array($raw_results2)){
//
$results = mysql_fetch_array($raw_results) puts data from database into
array, while it's valid it does the loop
// posts results gotten from database(title and text) you can also show
id ($results['id'])
}{
echo " Total amount of money payed by "
.$results['class'] ." "."class is " . $results ['Total'] .
" /=Tshs";
echo"<br>"; echo"<br>";
}
}
}
}
?>
所以我想通过php进行查询，这样我就可以获得215000作为这三个表的总计， 我需要帮助。 注意：id是自动增量。
答案 0 :(得分：2)
你可以用UNION做到这一点：
SELECT SUM(total) FROM
(
SELECT SUM(school_fee+trans_fee) As Total
FROM payment
UNION
SELECT SUM(school_fee+trans_fee) As Total
FROM payment_one
UNION
SELECT SUM(school_fee+trans_fee) As Total
FROM payment_two
) a