How to Update a Table Using Data Retrieved from an Inner Join in SQL?

Updating Data from an Inner Join in SQL

Consider the following scenario: you have a query that retrieves the FermentId from the FERMENT table based on an inner join with the [BELGIUM BEER] table. Now, you want to update another table, EXAMPLETABLE, using the retrieved FermentId.

Inner Join and Data Modification

In SQL, you can use an inner join to combine data from multiple tables based on a common column. However, directly updating rows from a joined query is not possible. To update a different table based on the results of an inner join, you need to follow a different approach.

Access Specific Syntax

In Microsoft Access, the syntax for updating data from an inner join query is slightly different. The SET clause comes after the join conditions. Additionally, the select and order by clauses should be omitted.

Updated Query for Access

Based on the provided query and the desired update, the updated query should look like this:

UPDATE FERMENT
INNER JOIN ([BELGIUM BEER] ON FERMENT.FermentName = [BELGIUM BEER].FermentId)
SET EXAMPLETABLE.FermentColumn = a.FermentColumn

This query updates the FermentColumn column in the EXAMPLETABLE based on the matching FermentId values obtained from the inner join query.

Note: The a alias in the updated query refers to the subquery that retrieves the FermentId values.

If the query does not work as expected, you can try building the join in the query builder to ensure its accuracy.

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