[英]how to select data from a table useing values from another table
I want to select data from a table called tbl_users
using a value from another table called mergeing
and column called donator_1
. 我想使用另一个表中的值(称为
mergeing
和列donator_1
从一个名为tbl_users
的表中选择数据。
I tried the following: 我尝试了以下方法:
$result = $DBcon->query("SELECT tbl_users.username, tbl_users.email, tbl_users.Phone_number FROM tbl_users,mergeing WHERE mergeing.donator_1= tbl_users.user_id AND mergeing._id = 6");
while($row = $result->fetch_array()) {
echo '<b>' . $l['user_id'] .'</b><b>' . $l['username'] . '</b>';
}
You can try nested queries: 您可以尝试嵌套查询:
SELECT username, email, Phone_number
FROM tbl_users
WHERE user_id = (SELECT donator_1 FROM mergeing WHERE _id = 6 )
or an inner join : 或内部联接:
SELECT username, email, Phone_number
FROM tbl_users
JOIN mergeing ON tbl_users.user_id = mergeing.donator_1
WHERE mergeing._id = 6
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