Sql update command for updating date along with timestamp
Sql update command for updating date along with timestamp - Two way sex cam android
So an expression to extract the month from a date field would look something like this: Date Part("m",[Birthday])“m” stand for month[Birthday] is the name of the field that stores employees' birthdates.
In addition to locating records by a difference between two dates, you can also query your database based on part of a date.
First, I will need to add a field to my table and name the field "Last Updated." This field will be used to store the date/time information gathered whenever a record is updated (you can use Microsoft's Northwind sample database to practice, if you like).
To test the data macro, just locate a record in the table and edit something.
The following method is only available for Microsoft Access 2010 databases, as this will use a new feature called a Data Macro to automatically update a Last Updated field to the current date and time whenever a record is modified.
For this example, let's say we want to track when an employee's contact information was last updated and build a query to locate employees whose information has not been updated recently (say, in the last year).
So, our Date Diff function is simply calculating the difference between when the field was last updated and right now.
To limit our query results down to show only those records older than 6 months, we can then tack on a greater than symbol and the number six after the Date Diff function.
We can achieve this level of control by writing an expression in the field's Validation Rule property box inside the table.
For more examples of validation rules and expressions, please visit the Microsoft Help Topic Create a validation rule to validate data in a field.
In our example, Date1 is the information stored in the Last Updated field.
For Date2, however, since we want to save and reuse the query, we want to reference the Now() function, to calculate using the system date and time.
Microsoft Access date functions are a powerful way to retrieve and analyze data in your Access databases, but very few users know about these functions or how to use them.