Get the solution ↓↓↓
I am trying to select two tables with where clause,
The problem: I am getting more than 2 result. something like123451111 I only have two ids with the value 1. I think I am doing it wrong.
The tables don't have the same structure and are not related by any means. Any ideas?
<?php include_once("config.php");
$s = '1';
$stmt =$mydb->prepare("select * FROM table1,table2 where table1.id = ? or table2.id = ?");
stmt->bind_param('ss', $s, $s);
echo $mydb->error;
$stmt->execute();
?>
<?php
$results = $stmt->get_result();
while ($row = $results->fetch_assoc()) {
echo $row['id']."<br/>";
}
?>
You need to have a join between table1 and table2 on some unique column, say id.
select * FROM table1,table2 where table1.id = table2.id;
Additionally you can have multiple filter conditions( say you want to filter the tables on id=101 -
select *
FROM table1,table2
where table1.id = table2.id
and table1.id = 101;
Hope this helps. Whenever you have multiple tables in a SQL statement, you need to join them otherwise the engine would make cartesian product as it happens in Cartesian product of mathematical set theory.
Basically you should have at least n-1 join conditions where n is the number of tables used.
Your question is a little problematic, but if your problem is not getting two id's, but you are getting one correctly with the use of a JOIN, you may be looking for a IN clause:
SELECT *
FROM table1,table2
WHERE table1.id = table2.id
AND table1.id IN (ID1, ID2);
Using IN instead of = lets you match multiple values to the table.id. This way, you get data from both tables and you get both ID's
This is join usage :
select t1.*,t2.* FROM table1 t1
left join table2 t2
on t1.id = t2.id
where t1.id = "keyword"
Our community is visited by hundreds of web development professionals every day. Ask your question and get a quick answer for free.
Find the answer in similar questions on our website.
Do you know the answer to this question? Write a quick response to it. With your help, we will make our community stronger.
PHP (from the English Hypertext Preprocessor - hypertext preprocessor) is a scripting programming language for developing web applications. Supported by most hosting providers, it is one of the most popular tools for creating dynamic websites.
The PHP scripting language has gained wide popularity due to its processing speed, simplicity, cross-platform, functionality and distribution of source codes under its own license.
https://www.php.net/
DBMS is a database management system. It is designed to change, search, add and delete information in the database. There are many DBMSs designed for similar purposes with different features. One of the most popular is MySQL.
It is a software tool designed to work with relational SQL databases. It is easy to learn even for site owners who are not professional programmers or administrators. MySQL DBMS also allows you to export and import data, which is convenient when moving large amounts of information.
https://www.mysql.com/
Welcome to the Q&A site for web developers. Here you can ask a question about the problem you are facing and get answers from other experts. We have created a user-friendly interface so that you can quickly and free of charge ask a question about a web programming problem. We also invite other experts to join our community and help other members who ask questions. In addition, you can use our search for questions with a solution.
Ask about the real problem you are facing. Describe in detail what you are doing and what you want to achieve.
Our goal is to create a strong community in which everyone will support each other. If you find a question and know the answer to it, help others with your knowledge.