I am new to SQL and PDO and PHP so I know I am asking a lot of myself. Still nothing ventured... I want to combine the results of two queries and am using aliases to make the column names the same for the UNION query. I have tried all sorts of reducing till there is nothing left to reduce, there are many more in the actual result I need for my app. I have the following code by can't think why it is not working.
Both queries work on their own but I get nothing when I combine them with a UNION. Any suggestions would be most helpful.
include ("conn/dbCon_1.php");
$sql= "(SELECT First_Name AS myResult FROM tbl_User WHERE First_Name LIKE ?)";
$sql.=" UNION ALL ";
$sql.= "(SELECT Course_Title AS myResult FROM tbl_Course WHERE Course_Title LIKE ? )";
$c1 = "%le%";
try {
$qResults = $dbConn->prepare($sql);
$qResults->execute([$c1]);
$qResults->fetch(PDO::FETCH_ASSOC);
return $qResults;
//Close connection
$dbConn = null;
} catch(PDOExcepetion $e) {
echo $e->getMessage();
}
Many thanks in anticipation and thank you for your kind attention.
Bri
由于您有两个占位符 - 您应该将值绑定两次 :
$qResults->execute([$c1, $c1]);
您使用两个参数调用查询(例如在第一个查询中,在第二个查询中调用,即使它们具有相同的值),因此您必须传递两个参数
$qResults->execute([$c1, $c1]);
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