01. Undo System 1 (18:52)
Creating an undo system in Microsoft Access  
Utilizing a change log table  
Adding a change timestamp  
Working with primary keys and auto numbers  
Implementing before update events  
Writing SQL insert into statements  
Using DMax and DLookup functions  
Designing an undo button in Access forms  
Opening record sets for reading and writing  
Handling multi-user scenarios with change logs

02. Undo System 2 (9:20)
Finishing undoing an edit
Moving focus to modified record
Editing records in order detail table
Using record set for data restoration
Handling order ID in restoration
Updating and closing record sets
Requerying form to update changes
Using DoCmd.FindRecord command
Looping through records to find ID
Storing order detail ID in a variable
Navigating records with DoCmd commands
Exiting loop if record isn't found

03. Undo System 3 (16:46)
Track type of change: edit, addition, or deletion  
Build custom delete button  
Handle undoing a record deletion  
Insert change type ID to change log  
Suppress built-in delete events in Access  
Turn off allowed deletions property  
Implement delete confirmation message box  
Use DoCmd.RunCommand for deletion  
Save deleted record to undo table  
Insert fields into table using SQL  
Determine action type for undo operation  
Handle additions and deletions in undo button  
Set auto number for adding record back  
Edit or delete specific record logic  
Finish adding rest of fields for undo  
Close and requery record sets after undo  
Address order ID constraint when undoing deletion

04. Undo System 4 (15:16)
Auto number reset issue  
Fixing auto number by adding and deleting record  
Handling duplicate values in primary key  
Restoring deleted records  
Using CurrentDB.Execute with error handling  
After insert event for record tracking  
Updating change log after record insertion  
Order detail change log issue  
Required fields during record insertion  
Using DoCmd.RunSQL for error visibility

05. Undo System 5 (14:15)
Hiding the undo button based on change log
Implementing On Current event for form
Using DLookup to find recent changes
Visibility toggle for undo button
Creating a function for recent change timestamp
Handling undo button caption text
Select Case to determine change type
Adjusting button size for captions
Explaining potential redo functionality
Discussing a pop-up change log feature