1. Today’s Goals Answer questions about homework and lecture 2 Understand what a query is Understand how to create simple queries using Microsoft Access 2007 1R. Kornak, AIT Training, July 2009

2. Review Topic 1 2R. Kornak, AIT Training, July 2009

3. IFRI Data Workflow 1.Record Field Data on Paper Forms 3.Manage Data, Create Queries, and Perform Simple Analysis Using Microsoft Access 2.Enter Data Using IFRI Data Entry Application 4. Export Data for Advanced Analysis and Visualization Using Other Software (e.g. Excel, SPSS, STATA, GIS) 3R. Kornak, AIT Training, July 2009

4. Review The IFRI database has 24 tables that are linked together based on their relationships Most forms correspond with one table One row for each instance of a form Column names used in the database are found in the IFRI manual in <> after each question Each column can only have one data type 4 R. Kornak, AIT Training, July 2009

5. Review Coded values are used to represent multiple choice answers The codes used in the database are shown in ( ) with each question in the IFRI Manual You can use Microsoft Access to explore your data using the sort and filter tools 5R. Kornak, AIT Training, July 2009

6. Introduction to Database Queries Topic 2 6R. Kornak, AIT Training, July 2009

7. What is a Database Query? A way to create subsets of the full IFRI database that address a particular research question The result of a query is a table showing only the data you are interested in at a given time Allows you to combine data from multiple forms and sites 7R. Kornak, AIT Training, July 2009

8. Database Queries Your results can be explored in Access or exported to another program such as SPSS, Excel, or GIS Queries can be saved and/or modified for future use –Provides a record of your calculations if you need to redo them or document them for a paper 8R. Kornak, AIT Training, July 2009

9. Queries Tools in Access 2007 We will use the “Design View tool” to create queries in this class This tool allows us to add tables to a workspace and specify fields from each one that we are interested in Similar to a table, you can view your query in design view or data sheet view 9R. Kornak, AIT Training, July 2009

10. Software Demonstration Description of tools on the create tab of the ribbon Adding a table to a query Explore your query in design view and data sheet view The “run” button runs your query 10R. Kornak, AIT Training, July 2009

11. Queries in Access 2007 There are tools to specify how the results should be sorted and filtered using one or more variables Similar to the “filter” tool we talked about yesterday except you can use multiple variables at the same time 11R. Kornak, AIT Training, July 2009

12. Software Demonstration 12R. Kornak, AIT Training, July 2009

13. Types of Queries There are many different types of queries in Microsoft Access Today we are only going to talk about 3 types –Select Queries –Make Table Queries –Summary Queries 13R. Kornak, AIT Training, July 2009

14. Select Queries Allow you to select only the variables you are interested in A select query does NOT make a copy of your data tables 14R. Kornak, AIT Training, July 2009

15. Select Queries The data shown in your results will automatically update if you make changes to your master data tables Data in your master tables will automatically update if you make changes in your results table 15R. Kornak, AIT Training, July 2009

16. Software Demonstration Let’s practice by creating a very simple select query using only the OVERSITE table Make a change in either your master table or results table and see how they both update Save the query for later use 16R. Kornak, AIT Training, July 2009

17. Make Table Queries Allow you to select only the variables you are interested in and create a new table from them A make table query makes a copy of your data and adds it to a new table 17R. Kornak, AIT Training, July 2009

18. Make Table Queries The data shown in your results will NOT automatically update if you make changes to your master data tables Data in your master tables will NOT automatically update if you make changes in your results table 18R. Kornak, AIT Training, July 2009

19. Software Demonstration Let’s practice by opening the select query we just made and changing it to a make table query Specify a name for your new table and run the query Make a change in either your master table or results table and see how they both DO NOT update Save the query for later use 19R. Kornak, AIT Training, July 2009

20. Summary Queries Allow you to create summary statistics about one or more tables Count –e.g. find number of plots per forest or plots per site Average, Total (Sum), Minimum, Maximum, Standard Deviation, Variance –e.g. find the average tree height per plot Summary queries can be saved as either make table or select queries 20 R. Kornak, AIT Training, July 2009

21. Summary Queries Summary queries are very helpful when you first begin exploring your data Similar to the filter tool except you can count how many of each value occur in your data (histogram) You can easily create histograms for each variable to see if there are any significant patterns You can easily identify and correct missing or incorrect data 21 R. Kornak, AIT Training, July 2009

22. Software Demonstration Let’s practice by opening the make table query we just finished We will make a few small changes to it to create a summary query 22R. Kornak, AIT Training, July 2009

23. Homework 1 Create a select by query with only the following variables –FNAME –FSIZE –FTOPOGRAPH –FSTEEP Save the query as “Select_Forest” 23R. Kornak, AIT Training, July 2009

24. Homework 2 Using the query “Select_Forest” answer the following questions: Which of the variables are coded values and which are measured values? How big is the Khog Bung Preu Forest? How many forests are “primarily steep”? What does the value “0” mean in the FSTEEP column? 24R. Kornak, AIT Training, July 2009

25. Homework 3 Create a make table query with only the following variables –FK_FOREST –PPIN –PSTEEP Save the query as “MakeTable_Plot” Run the query and save the table as “Plot_results” 25R. Kornak, AIT Training, July 2009

26. Homework 4 Using the table “Plot_results” answer the following questions: –What are the units of PSTEEP? –How many plots are in the table? –How many plots are missing data (value of 0) in the PSTEEP field? –What is the maximum steepness? (hint – use the sort tool) –How many plots have a value of 5 for “FK_FOREST? (hint – use the filter tool) 26 R. Kornak, AIT Training, July 2009

27. Homework 5 Create a new table using a make table query with the following fields: –SNAME –SMARKET –SINDPOP Run the query and save the table as “Settlement_Sample” 27R. Kornak, AIT Training, July 2009

28. Homework 6 What do each of the fields mean in the “Settlement_Sample” table? What data type is each field? What are the units of SMARKET? 28R. Kornak, AIT Training, July 2009

29. Homework 7 Add the “Settlement_sample” table to a new query Select the totals icon and make your query match the one below 29 R. Kornak, AIT Training, July 2009

30. Homework 8 Run the query (you may need to rename the table or change it to a select query) What is the average distance to market? What does the “count” statistic mean? 30R. Kornak, AIT Training, July 2009

31. Homework 9 Add the PRODUCT table to a new query Select the totals icon Add the “RNAME” field to your query 2 times Under the “Total Option” choose “Group By” for the first RNAME and “Count” for the second RNAME 31R. Kornak, AIT Training, July 2009

32. 32R. Kornak, AIT Training, July 2009

33. Homework 10 You just created a histogram of product types How many unique products are in the table? What are the 3 most common products? 33R. Kornak, AIT Training, July 2009