What is a query and how do I use the Query tool?
The query tool allows you to look for specific pieces of information in a data layer. For example, you might want to query the asthma hospitalizations layer for all towns with greater than average hospitalizations. Once you perform a query using the instructions below, the results will be displayed in the Map Information box and the features of the layer (in this example, towns) that met criteria in the query will be highlighted. 1. Click on . 2. Select the layer you would like to query, and make that layer active by selecting the radio button next to the layer in the Layer list. It should look like this: . 3. In the Map Information tab, select the field you would like to query in the drop-down list entitled Field. 4. Select the operator to use in your calculations in the drop-down list entitled Operator. (Note: the default is =, the equals sign). 5. Either click on Get Samples to retrieve your choices, or type in what you want to query for. NOTE: It is recommended that you click on Ge
