PHP - SQL如何从表中选择ID并插入另一个表？

Question

I need to do an inner join with the insert into statement. I need to insert data into 2 tables but the id of the records from the second table should also be stored into a column from the first table.

the first sql section makes a new record for every given dj name in the dj table, the second part is supposed to get the id from the added dj and insert it into a column from table "articles".

$alle_djs = explode(', ', $this->djs);
foreach ($alle_djs as $elke_dj) {
  $sql = "INSERT INTO dj (name) VALUES ( :name_dj )";
  $st = $conn->prepare($sql);
  $st->bindValue( ":name_dj", $elke_dj, PDO::PARAM_STR );
  $st->execute();

  $sql2 = "INSERT INTO articles (dj_ids) SELECT id FROM dj WHERE name=:name_dj";
  $st2 = $conn->prepare($sql2);
  $st2->bindValue( ":name_dj", $elke_dj, PDO::PARAM_STR );
  $st2->execute();
}
$conn = null

Answer 1

Use the LAST_INSERT_ID() function:

$sql2 = "INSERT INTO articles(dj_ids) VALUES (LAST_INSERT_ID())";