title: Mysql ERROR 1241 (21000): Operand should contain 1 column
body: <p>I'm attempting to insert some data with MySQL using a subquery like so:</p>
  
  <pre><code>INSERT
  INTO dw_plynjasa.jumlah_fact
      SELECT null, jasa_sk, waktu_sk, sum(hrg_pes), count(d.no_pes) 
      FROM   dw_plynjasa.jasa_dim      a,
             dw_plynjasa.waktu_dim     b,
             oltp_plynjasa.detil_pesan c,
             oltp_plynjasa.pesan       d,
             oltp_plynjasa.jasa        e
      WHERE  b.tgl = d.tgl_pes
        AND  a.kd_jasa = e.kd_jasa
        AND  a.nm_jasa = e.nm_jasa
        AND  a.satuan = e.satuan
        AND  a.hrg_satuan = e.hrg_satuan 
      GROUP  BY (jasa_sk, waktu_sk);
  </code></pre>
  
  <p>but I get only <code>error 1241, operand should contain 1 column(s)</code></p>
  
  <p>How can I fix my query?</p>