The Find Unmatched query will search through the database and locate records that don't have any corresponding records in a related table. Using the Find Unmatched Query Wizard, Adam creates a series of queries that identify salespeople without any sales, and customers that haven't yet placed an order.
- [Voiceover] Over time, your database will grow and change,…and records will get added and removed.…Throughout these changes, it's possible…that records in some tables may lose connection…to related records in other tables.…If we think back to our table relationships,…the most typical is a one-to-many relationship.…One record in Table A corresponds…to many records in Table B.…You may often hear to this referred to…as Table A being the parent and Table B the child.…When a record in a parent table has no…corresponding records in the child table,…those records are called widows.…When a record in a child table…has no corresponding records in the…parent table, they're called orphans.…
In either case, it may be an indicator…that something has gone awry, or it might be just fine,…depending on the particulars of your data.…While you'll have to make the decision on whether…something needs to be done about…orphaned or widowed records, the first step…is to identify where this has occurred.…The unmatched query is the tool for the job.…
- Creating a query with the wizard
- Defining query criteria
- Using comparison and wildcards in criteria
- Working with joins
- Creating parameter queries
- Using the built-in functions in Access
- Summarizing data
- Aggregating records with totals
- Working with dates
- Creating alternative queries: unmatched, crosstab, and more
- Writing queries with SQL
Skill Level Intermediate
1. Introduction to Access Queries
2. Creating Simple Select Queries
3. Creating Parameter Queries
4. Use the Built-In Functions
5. Aggregating Records with a Totals Query
6. Working with Dates in Queries
7. Understanding Program Flow Functions
8. Alternative Query Types
9. Writing Queries with Structured Query Language
Explore the basics of SQL5m 59s
10. Useful Query Tricks
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