title: Insert into partition table postgresql
body: <p>everyone!
  I'm trying to insert data from non-partition  table t1 to a partition one t2 with</p>
  <pre><code>insert into t2 (select * from t1);
  </code></pre>
  <p>But I get an error: Partition key of the falling row contains (<em>column_name</em>) = (<em>value</em>)</p>
  <p>What can be wrong?
  t2 is partitioned by months by column <em>date_name</em> , not <em>column_name</em></p>
  <p>P.s. when I try to insert data from partition to partition table with the same way, I get the same error</p>
  <p>Hoe should I insert data in partition table?
  Version: <strong>Postgresql 11</strong></p>