ACC: Updating a Table from a Second Table Using an Expression

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The sample query below adds data from the Current Week table to the records in the Yearly Rainfall table.

NOTE: This type of query does not work if the data being added is the result of a totaling or grouping.

1. Create a new table with the following fields and save it as Yearly Rainfall:
   

         City      Inches   Last Updated
         -------------------------------
         Baroda     0.5     4/2/93
         Basildon  22.0     4/2/93
         Beaver    18.0     4/2/93

2. Create a new table with the following fields and save it as Current Week:
   

         City      Inches   Week Of
         --------------------------
         Baroda     0.1     4/9/93
         Basildon   2.0     4/9/93
         Beaver     2.5     4/9/93

3. Create a new query based on the tables Yearly Rainfall and Current Week. Join the tables on the City field.
4. On the Query menu, click Update.
5. Drag the Last Updated and Inches fields from the Yearly Rainfall table to the query grid.
6. Create the following entries in the Update To row of the query grid:
   

         Field: Last Updated
            Table: Yearly Rainfall
            Update To: [Current Week].[Week Of]
         Field: Inches
            Table: Yearly Rainfall
            Update To: [Yearly Rainfall].[Inches]+[Current Week].[Inches]

7. Save and then run the query.
   

      The data in the table Yearly Rainfall is now:
   
         City      Inches     Last Updated
         ---------------------------------
         Baroda     0.6       4/9/93
         Basildon  24.0       4/9/93
         Beaver    20.5       4/9/93