grafana/public/app/plugins/datasource/postgres/partials/query.editor.html

<query-editor-row query-ctrl="ctrl" has-text-edit-mode="true">

  <div ng-if="ctrl.target.rawQuery">
  	<div class="gf-form-inline">
  		<div class="gf-form gf-form--grow">
  			<code-editor content="ctrl.target.rawSql" datasource="ctrl.datasource" on-change="ctrl.panelCtrl.refresh()" data-mode="sql">
  			</code-editor>
  		</div>
  	</div>
  </div>

  <div ng-if="!ctrl.target.rawQuery">
    <div class="gf-form-inline">
      <div class="gf-form">
        <label class="gf-form-label query-keyword width-7">FROM</label>
        <metric-segment segment="ctrl.schemaSegment" get-options="ctrl.getSchemaSegments()" on-change="ctrl.schemaChanged()"></metric-segment>
        <metric-segment segment="ctrl.tableSegment" get-options="ctrl.getTableSegments()" on-change="ctrl.tableChanged()"></metric-segment>
      </div>
    </div>
  </div>

  <div class="gf-form-inline">
    <div class="gf-form">
			<label class="gf-form-label query-keyword">Format as</label>
			<div class="gf-form-select-wrapper">
				<select class="gf-form-input gf-size-auto" ng-model="ctrl.target.format" ng-options="f.value as f.text for f in ctrl.formats" ng-change="ctrl.refresh()"></select>
			</div>
		</div>
		<div class="gf-form">
      <label class="gf-form-label query-keyword" ng-click="ctrl.showHelp = !ctrl.showHelp">
        Show Help
        <i class="fa fa-caret-down" ng-show="ctrl.showHelp"></i>
        <i class="fa fa-caret-right" ng-hide="ctrl.showHelp"></i>
      </label>
		</div>
		<div class="gf-form" ng-show="ctrl.lastQueryMeta">
      <label class="gf-form-label query-keyword" ng-click="ctrl.showLastQuerySQL = !ctrl.showLastQuerySQL">
        Generated SQL
        <i class="fa fa-caret-down" ng-show="ctrl.showLastQuerySQL"></i>
        <i class="fa fa-caret-right" ng-hide="ctrl.showLastQuerySQL"></i>
      </label>
		</div>
		<div class="gf-form gf-form--grow">
			<div class="gf-form-label gf-form-label--grow"></div>
		</div>
	</div>

	<div class="gf-form" ng-show="ctrl.showLastQuerySQL">
		<pre class="gf-form-pre">{{ctrl.lastQueryMeta.sql}}</pre>
	</div>

	<div class="gf-form"  ng-show="ctrl.showHelp">
		<pre class="gf-form-pre alert alert-info">Time series:
- return column named <i>time</i> (UTC in seconds or timestamp)
- return column(s) with numeric datatype as values
- (Optional: return column named <i>metric</i> to represent the series name. If no column named metric is found the column name of the value column is used as series name)

Table:
- return any set of columns

Macros:
- $__time(column) -&gt; column as "time"
- $__timeEpoch -&gt; extract(epoch from column) as "time"
- $__timeFilter(column) -&gt;  extract(epoch from column) BETWEEN 1492750877 AND 1492750877
- $__unixEpochFilter(column) -&gt;  column &gt; 1492750877 AND column &lt; 1492750877
- $__timeGroup(column,'5m') -&gt; (extract(epoch from column)/300)::bigint*300 AS time

Example of group by and order by with $__timeGroup:
SELECT
  $__timeGroup(date_time_col, '1h'),
  sum(value) as value
FROM yourtable
GROUP BY time
ORDER BY time

Or build your own conditionals using these macros which just return the values:
- $__timeFrom() -&gt;  to_timestamp(1492750877)
- $__timeTo() -&gt;  to_timestamp(1492750877)
- $__unixEpochFrom() -&gt;  1492750877
- $__unixEpochTo() -&gt;  1492750877
		</pre>
	</div>

	</div>

	<div class="gf-form" ng-show="ctrl.lastQueryError">
		<pre class="gf-form-pre alert alert-error">{{ctrl.lastQueryError}}</pre>
	</div>

</query-editor-row>