title: Syntax error on MERGE statement
body: <p>I'm trying to do a MERGE statement in Go:</p>
  
  <pre><code>query := "MERGE staged ON (email=$1)" +
  " WHEN NOT MATCHED THEN INSERT (email, secret, passwd, ts, newAcct)" +
  " VALUES($1,$2,$3,$4,TRUE)" +
  " WHEN MATCHED THEN UPDATE staged SET" +
  " newAcct=TRUE, existingUser=NULL, secret=$2, ts=$4"
  
  _, err := db.Exec(query, email, secret, passwd, time.Now())
  </code></pre>
  
  <p>but I got this error:</p>
  
  <pre><code>pq: S:"ERROR" F:"scan.l" R:"scanner_yyerror" L:"1001" M:"syntax error at or near \"MERGE\"" P:"1" C:"42601"
  </code></pre>
  
  <p>The same happens in MySQL:</p>
  
  <pre><code>Error 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 'MERGE staged ON (email=?) WHEN NOT MATCHED THEN INSERT (email, secret, passwd, t' at line 1
  </code></pre>
  
  <p>What's wrong?</p>