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Identifying unmatched records


From:

Access 2010: Queries in Depth

with Adam Wilbert

Video: Identifying unmatched records

The Find Unmatched query is another query type that we can use to keep our database organized. The Find Unmatched query will look at one table and find all of the records that will have associated data in another table. Let's take a look at how we can use the Find Unmatched query to find all of the states that don't have any customers in them yet. We'll go up to the Create tab and we'll select the Query Wizard. I'll choose the Unmatched Query Wizard and say OK. Now, we need to choose the table that has the information in it that we're looking for.
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  1. 9m 9s
    1. Welcome
      1m 10s
    2. Using the exercise files
      41s
    3. Introducing the database
      4m 29s
    4. Previewing the course
      2m 49s
  2. 17m 17s
    1. Understanding queries
      3m 31s
    2. Following naming conventions and best practices
      2m 56s
    3. Using the Query Wizard
      5m 21s
    4. Exploring the design interface
      5m 29s
  3. 26m 39s
    1. Defining criteria
      5m 40s
    2. Understanding comparison operators
      3m 19s
    3. Defining the column headers
      2m 49s
    4. Exploring the property sheet
      7m 32s
    5. Printing query results
      2m 41s
    6. Working with joins
      4m 38s
  4. 14m 14s
    1. Understanding parameter queries
      4m 27s
    2. Obtaining parameters from forms
      5m 17s
    3. Creating a combo box
      4m 30s
  5. 23m 24s
    1. Understanding the Totals field
      5m 31s
    2. Creating aggregate calculations
      3m 31s
    3. Exploring the Expression Builder interface
      4m 28s
    4. Using mathematical operators
      5m 46s
    5. Applying text functions
      4m 8s
  6. 24m 23s
    1. Understanding dates as serial numbers
      2m 42s
    2. Specifying a range of dates or times
      3m 47s
    3. Formatting dates
      4m 31s
    4. Using other Date/Time functions
      3m 47s
    5. Defining today's date
      2m 41s
    6. Calculating time intervals
      6m 55s
  7. 19m 55s
    1. Introducing the conditional IIf function
      2m 43s
    2. Creating an IIf function
      7m 31s
    3. Nesting IIf functions
      4m 57s
    4. Using the Switch function
      4m 44s
  8. 20m 41s
    1. Understanding the reporting tool
      2m 13s
    2. Building the form
      6m 57s
    3. Building the query
      5m 4s
    4. Building the report
      3m 30s
    5. Finalizing the reporting tool
      2m 57s
  9. 25m 37s
    1. Finding duplicate records
      2m 17s
    2. Identifying unmatched records
      2m 29s
    3. Creating crosstab results
      2m 57s
    4. Creating backups
      1m 29s
    5. Creating update queries
      3m 22s
    6. Making, deleting, and appending records
      5m 36s
    7. Uniting tables
      3m 16s
    8. Embedding SQL code in queries
      4m 11s
  10. 1m 0s
    1. Next Steps
      1m 0s

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Watch the Online Video Course Access 2010: Queries in Depth
3h 2m Intermediate Jun 16, 2011

Viewers: in countries Watching now:

In this course, author Adam Wilbert illustrates how to create and leverage real-world queries and turn raw data into usable information. The course covers setting up queries, performing calculations, using the built-in Access functions to further refine query results, and identifying top performers or areas for improvement based on a range of criteria.

Topics include:
  • Naming conventions and best practices
  • Working with joins
  • Using comparison operators
  • Defining criteria for select queries
  • Creating parameter queries
  • Creating calculated fields
  • Working with dates and times
  • Using the Expression Builder
  • Creating conditional statements
  • Making, deleting and appending records
  • Building reports
Subject:
Business
Software:
Access Office
Author:
Adam Wilbert

Identifying unmatched records

The Find Unmatched query is another query type that we can use to keep our database organized. The Find Unmatched query will look at one table and find all of the records that will have associated data in another table. Let's take a look at how we can use the Find Unmatched query to find all of the states that don't have any customers in them yet. We'll go up to the Create tab and we'll select the Query Wizard. I'll choose the Unmatched Query Wizard and say OK. Now, we need to choose the table that has the information in it that we're looking for.

We're looking for all the states that don't have customers, so I'll choose the States table. Go ahead and say Next. Now, Access asks us which table or query contains the related records. Here we're looking for customers. So I'll select my DirectCustomers table and say Next. Access has correctly identified how those two tables are related. The Abbreviation field in the States table and the States field in the Customers table. We'll go ahead and say Next again. Now, Access ask us which field we want to see in our query results.

We're interested in finding out which states don't have customers so we'll just take state's name. Go ahead and say Next and we'll accept the default name. Press Finish. Access has identified that the state of Arkansas currently doesn't have any customers. So this could be an area where we could focus an advertising campaign. Let's take a look at one more example of the Find Unmatched query. We'll go back to the Query Wizard, Find Unmatched, and OK. This time we'll find out if we have any products that haven't had any orders placed with them yet.

We'll select the Products table and say Next. Which table or query contains the related records? We're looking for the Orders table here. Go ahead and say Next. Again, Access has identified how those two tables are related. We'll say Next. Which fields do you want to see in the query results? Well, I'm interested in which products haven't had orders for them yet, so I want to know the product ID and the product name that hasn't been used yet. We'll go ahead and say Next and again we'll accept this default name and say Finish.

Now, Access has identified the two products that haven't had any orders placed for them yet. We have the two sampler sizes in the extra virgin oil and the pure oil. We can use this information to identify products that we might want to place a promotion on. So those are just two examples of how you might apply your Find Unmatched query.

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