ArcGIS API for JavaScript ^3.26

require([
  "esri/tasks/query", ... 
], function(Query, ... ) {
  var query = new Query();
  ...
});

function executeQueryTask(event) {
  // When the user clicks on a map, the onClick event returns the event point 
  // where the user clicked. The event contains mapPoint (esri.geometry.Point)

  query.geometry = event.mapPoint;

  //Execute task
  queryTask.execute(query, showResults);
}

query.geometryPrecision = 1;

query.groupByFieldsForStatistics = ["SUB_REGION"];

function queryTaskExecuteCompleteHandler(queryResults){
  console.log("complete", queryResults);
}

function queryTaskErrorHandler(queryError){
  console.log("error", queryError.error.details);
}

var queryTask = new QueryTask("http://servername.fqdn.suffix/arcgis/rest/services/Hosted/pasadena/FeatureServer/0");
var query = new Query();
query.objectIds = [22];
query.multipatchOption = "xyFootprint";
query.outFields = ["*"];
query.returnGeometry = true;
queryTask.on("complete", queryTaskExecuteCompleteHandler);
queryTask.on("error", queryTaskErrorHandler);
queryTask.execute(query);

query.orderByFields = ["STATE_NAME DESC"];

query.outFields = ["NAME", "STATE_ABBR", "POP04"];

require([
  "esri/tasks/query", "esri/tasks/StatisticDefinition", ... 
], function(Query, StatisticDefinition, ... ) {
  var query = new Query();
  var statisticDefinition = new StatisticDefinition();
  statisticDefinition.statisticType = "sum";
  statisticDefinition.onStatisticField = "POP2000";
  statisticDefinition.outStatisticFieldName = "TotalPop";

  query.outStatistics = [statisticDefinition];
  ...
});

var query = new Query();
query.quantizationParameters = {
  mode: "view",
  originPosition: "upperLeft",
  tolerance: 4820,
  extent: layer.fullExtent
};

require([
  "esri/tasks/query", ... 
], function(Query, ... ) {
  var query = new Query();
  query.spatialRelationship = Query.SPATIAL_REL_CONTAINS;
  ...
});

query.text = stateName;

require([
  "esri/layers/FeatureLayer", "esri/TimeExtent", "esri/tasks/query", ... 
], function(FeatureLayer, TimeExtent, Query, ... ) {
  var layer = new FeatureLayer( ... );
  var timeExtent = new TimeExtent( ... );
  var timeQuery = new Query();
  timeQuery.timeExtent = timeExtent;
  layer.queryFeatures(timeQuery,function(featureSet) {});
  ...
});

  query.where = "NAME = '" + stateName + "'"; 
		

  query.where = "POP04 > " + population;