title: Does dolphindb support list query?
body: <p>I would like to apply the following group of SQL statements at once and union the result to get the most recent record behind mt=52355979 of various stock(idetified by 'symbol') of different trade places and market types(identified by 'c1','c2','c3','c4').</p>
  
  <pre><code>select * from t where symbol=`A,c1=25,c2=814,c3=11,c4=2, date=2020.02.05, mt&lt;52355979 order by mt desc limit 1
  select * from t where symbol=`B,c1=25,c2=814,c3=12,c4=2, date=2020.02.05, mt&lt;52355979 order by mt desc limit 1
  select * from t where symbol=`C,c1=25,c2=814,c3=12,c4=2, date=2020.02.05, mt&lt;52354979 order by mt desc limit 1
  select * from t where symbol=`A,c1=1180,c2=333,c3=3,c4=116, date=2020.02.05, mt&lt;52355979 order by mt desc limit 1
  
  </code></pre>
  
  <p>The filter columns in where condition will not change, while the filter values may change each time. Does DolphindB offer querying methods which allow to run list query with varying input parameters?</p>