UPDATE is especially useful when you want to change many records or when the records that you want to change are in multiple tables. You can change several fields at the same time. The following example increases the Order Amount values by 10 percent and the Freight values by 3 percent for shippers in the United Kingdom:. This example changes values in the ReportsTo field to 5 for all employee records that currently have ReportsTo values of 2.
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MoveFirst Do Until rst. EOF rst. Edit copyMVF rst! Update rst. Use a multivalued field in a query. Add criteria to a multivalued field in a query. Add multiple criteria to a multivalued field in a query.
Grouping and counting a multivalued field in a query. Use an Append query with a multivalued field. Use an Update query with a multivalued field. Use a Delete query with a multivalued field. The display value of a Lookup field is automatically shown in query datasheet view by default.
When you create a query, you can override this behavior so that the bound value is shown instead. In this example, suppose you want to see the bound value of a Lookup field in a Headquarters table that "looks up" a New England state name.
In this example, add Headquarters and NewEngland tables. For more information, see Join tables and queries. Drag the a field along with the Lookup field to the query design grid. In this example, add the City and NEState field.
In this example, use the NEState field. In the property sheet, select the Lookup tab, and then in the Display Control property, select Text Box. Result Now when you view the query in Datasheet View, you see the corresponding bound value of the display value. When you create a Lookup field, a join is created between the Bound value and the Display value. Although you cannot directly use the Display value in a query, you can use the corresponding value from the other data source.
In this example, suppose you want to use the display value of the Lookup field, NEState , in the Headquarters table in a query as criteria. In this example, add the Headquarters and NewEngland tables.
The two tables should be joined. Drag the fields that you want to use to the query grid. In this example, drag City from the Headquarters table to the first column, NEState from the Headquarters table to the second column, and StateName from the NewEngland table to the third column.
Clear the Show check box of the StateName in the query grid. In the query grid, under StateName , in the Criteria row, enter Vermont. The query criteria is based on the StateName column, which of course is the same value as the Display value, NEState , but is not shown in Datasheet View. On the Design tab, in the Results group, click Run. Here are the 3 update queries I tried and got the same error each time. CustomerSales is a linked table the source table - data came from this table. The three queries below produce the same result, but none of them succeeded due to the Access error "Operation must use an updatable query".
Query 1: This is the most common way to do multiple table update in Access. CustomerID set a. CustomerID, x. CustomerID as b on a. It's less efficient than using inner join because join can take advantage of the index on the join column if it exists.
SalesDate The solution: To fix the problem, I had to split my original update query into two queries. The first one is a make-table query and the other one is a cross-table update query. This query uses the temporary table we created in Step 1 to update the local table. SalesDate To sum up, when we do multiple table updates in MS Access, first we need to make sure that the source table contains unique data in the joined column s. This may be a primary key column or a column with unique index, or columns with combined uniqueness also known as composite unique index.
Uniqueness prohibits duplicated values in the column s. Secondly, if the source table is a linked table, we can resort to a two-step process. Building a temporary table in Access that contains the data obtained from the linked table, then do the update locally by using the temporary table as the source table because the temporary table contains the qualified data from the linked table.
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