Php 如何使用union在两个表中搜索?
我正在尝试使用以下联合查询在两个表中搜索:Php 如何使用union在两个表中搜索?,php,mysql,pdo,Php,Mysql,Pdo,我正在尝试使用以下联合查询在两个表中搜索: public function searchInAll($keyword) { $sql = "(SELECT * FROM user_information WHERE title LIKE ? OR name LIKE ? OR surname LIKE ?) UNION (SELECT * FROM groups WHERE name LIKE ?)";
public function searchInAll($keyword) {
$sql = "(SELECT * FROM user_information
WHERE title LIKE ? OR name LIKE ? OR surname LIKE ?)
UNION
(SELECT * FROM groups WHERE name LIKE ?)";
$query = $this->db->prepare($sql);
$result = $query->execute(array("%$keyword%", "%$keyword%", "%$keyword%", "%$keyword%"));
if($query->rowCount()) {
$results = $query->fetchAll();
return $results;
}
return false;
}
它总是返回false。例如,我试着用一张桌子
SELECT * FROM groups WHERE name LIKE ?
或
这些工作,但对于两个表,它不工作
为什么返回错误
用户信息:
小组:
注意:
它们之间没有联系。它们是不同的表。如果两个表的列数不同,则不能使用
SELECT*
和UNION
您应该这样做:
(
SELECT id, name, 'user' AS type
FROM user_information
WHERE title LIKE ? OR name LIKE ? OR surname LIKE ?
)
UNION
(
SELECT id, name, 'group' AS type
FROM groups
WHERE name LIKE ?
)
但是如何在phppdo中使用数组的from中获得的结果呢?
(
SELECT id, name, 'user' AS type
FROM user_information
WHERE title LIKE ? OR name LIKE ? OR surname LIKE ?
)
UNION
(
SELECT id, name, 'group' AS type
FROM groups
WHERE name LIKE ?
)