使用多个查询合并来自两个mysql数据库的两个表

Question

Now that I know that one query will not be able to combine two tables from two different mysql databases, Is it possible to create multiple queries to display results in PHP after combining two tables from two mysql databases? I have two mysql databases that have different passwords. I would like to display the results after I join two tables: one from each database. This is what I have thus far:

$connectdb1 = mysqli_connect("localhost", "dblogin1", "pswd1", "db1");
$connectdb2 = mysqli_connect("localhost", "dblogin2", "pswd2", "db2");

$sorc815sql = "SELECT * FROM db1.myaudtable LEFT JOIN db2.contacttable ON myaudtable.myAudContactID=contacttable.contactID";

$sorc815res = mysqli_query($sorc815sql);
echo '<br>$sv815res='.$sorc815res;

I do get an error, "Warning: mysqli_query() expects at least 2 parameters, 1 given in (file location) on line 31"

Answer 1

mysqli_query($connection,$query) expects 2 parameters. first one is the connection string, in your case $connectdb1 or $connectdb2 and second query $sorc815sql

You can't join two tables from different database in a single query.