Laravel MySQL多个表的联合

Question

I have multiple identical mysql database tables .
What I need is a raw sql or Laravel schema to get the Union of all the tables in the database except the one's that are not identical.
I already tried the following code

$multipleUnion = DB::table('teble_1')->union(DB::table('teble_2')->union(DB::table('teble_3')))->get();

but I got this error

SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'union (select * from table_3 ))' at line 1 (SQL: (select * from table_1 ) union ((select * from table_2 ) union (select * from table_3 )))

I don't want to query like

SELECT * FROM table_1 UNION SELECT * FROM table_2 UNION SELECT * FROM table_3

Because the number of tables can increase as the time goes. Thanks in Advance.

Answer 1

Try this:

$multipleUnion = DB::table('teble_1')->union(DB::table('teble_2'))
    ->union(DB::table('teble_3'))->get();

Creating a query from an array of table names:

$query = DB::table($tables[0]);
foreach(array_slice($tables, 1) as $table) {
    $query->union(DB::table($table));
}
$multipleUnion = $query->get();