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[英]Query MySQL results using PHP and multiple HTML dropdown boxes from multiple tables including 'id' reference tables
[英]show results from multiple mysql tables using php
我有多个具有相同结构的mysql表。 我试图用一个查询显示所有表的所有结果。 我已经在网上搜索了几个小时,这就是我想出的。
$videos_query = mysql_query("SELECT
table1.title,
table1.url,
table1.image,
table2.title,
table2.url,
table2.image,
table3.title,
table3.url,
table3.image
FROM
table1
INNER JOIN table2 ON table1.url = table2.url
INNER JOIN table3 ON table1.url = table3.url");
while($video_info = mysql_fetch_array($videos_query)){
但是,在PHP im中使用以上代码会得到错误“警告:mysql_fetch_array()期望参数1为资源,给定布尔值”
您的SQL查询中有一个错误table1
必须是table2
:
$videos_query = mysql_query("SELECT
table1.title,
table1.url,
table1.image,
table2.title,
table2.url,
table2.image,
table3.title,
table3.url,
table3.image
FROM
table1
INNER JOIN table2 ON table1.url = table2.url
INNER JOIN table3 ON table1.url = table3.url");
if (mysql_num_rows($videos_query) > 0) {
while ($video_info = mysql_fetch_array($videos_query)) {
// process your data here
}
}
如果要执行联合选择:
$videos_query = mysql_query("
SELECT title, url, image
FROM table1
UNION
SELECT title, url, image
FROM table2
UNION
SELECT title, url, image
FROM table3
");
if (mysql_num_rows($videos_query) > 0) {
while ($video_info = mysql_fetch_array($videos_query)) {
// process your data here
}
}
另外,也许您想按某列排序-因此,请在此添加ORDER BY
+ column_name。
更改
INNER JOIN table2 ON table1.url = table1.url
至
INNER JOIN table2 ON table1.url = table2.url
在选中“ ON
您正在比较table1.url = table1.url
,这是不正确的。
这是正确的代码:
$videos_query = mysql_query("SELECT
table1.title,
table1.url,
table1.image,
table2.title,
table2.url,
table2.image,
table3.title,
table3.url,
table3.image
FROM
table1
INNER JOIN table2 ON table1.url = table2.url
INNER JOIN table3 ON table1.url = table3.url");
while($video_info = mysql_fetch_array($videos_query)){
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