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[英]How to link the foreign key field to a primary key field from another table using php and mysql?
[英]PHP primary key table from foreign key
book_id|title
1 |apple
2 |banana
3 |volkswagen
genre_id|name
1 |fruits
2 |cars
id|book_id|genre_id
1 | 1 | 1
2 | 3 | 2
3 | 2 | 1
我想按字母顺序显示所有类型为水果的书籍,我的代码是:
<?php
include "mysql-connect.php";
$sql =
"SELECT title
FROM books
INNER JOIN multiple ON book.book_id = multiple.book_id
VALUES ('1')";
if (mysqli_query($conn, $sql)) {
while($row = $result->fetch_assoc()) {
echo "" . $row["title"]."<br>";
}
} else {
echo "0 results";
}
$conn->close();
?>
更改值后仍显示0个结果
这是什么?
SELECT title
FROM books
INNER JOIN multiple
ON book.book_id = multiple.book_id VALUES ('1')
对我来说,这看起来不像是有效的SELECT查询, WHERE
在WHERE
? 典型值用于插入
INSERT INTO multiple (id) VALUES (1)
可能您需要这样的东西
SELECT title
FROM books
INNER JOIN multiple
ON book.book_id = multiple.book_id
WHERE
some_column = 1
这是some_column
我不知道。
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