1. Querying a View ArcView_module_4 May 13, 9:00 AM

2. Outline Concept Uses of Query Types of Query Demo How to select features in ArcView

3. Uses of Query enables you to find specific geographic features that interest you or meet certain important criteria e.g. area with high percentage of mortality? e.g. area with no aquifer? e.g. area with HH income level less than 20K? e.g. area underserved by medical service

4. Types of Query Query over one theme By location By attributes Query over the spatial relationships between themes (spatial overlay)

5. Types of Query Query over one theme By location - By attributes - Query over the spatial relationship between themes “ Theme-on-theme selection ”

6. Selecting features by location the Select Feature tool Point at theme or draw the selection box Hold shift key to add selection To unselect features, click again while holding shift key the Select Features Using Graphic Draw a graphic using the Draw tool, and then find the features that intersect the graphic

7. Selecting features by location the Find tool Find the feature with the value you specified in the Find textbox, in any of text fields Select one feature at a time The value typed in the textbox doesn ’ t have to be quoted the Pointer tool in a Table When you work table and map side by side the Query Builder button Select features according to their attributes values

8. How to build Query Choose 1. the field2. operator3. value

9. Using the Query Builder Strings should be quoted in queries Case-insensitive ( [state_name] = "california" ) Use * as a multiple character wildcard ( [state_name] = "missi*" )

10. How to build Query A OR B A AND B

11. Find vs Query Builder FindQuery Builder Specify fieldnoyes #feature selected Only one at a time Any # feature that meets criteria Numeric fieldNo (only text field) Yes Text fieldYes (no quote) Yes (quote)