On 16 March 2015 at 17:02, Rob Richardson <rdrichard...@rad-con.com> wrote:
> Greetings!
>
>
>
> An update query is apparently succeeding, even though the query refers to
> fields that do not exist.  Here’s the query:
>
>
>
> update inventory set
>
> x_coordinate = (select x_coordinate from bases where base = '101'),
>
> y_coordinate = (select y_coordinate from bases where base = '101')
>
> where charge = 100
>
>
>
> -- select x_coordinate, y_coordinate from bases where base = '101'
>
>
>
> When I run the update query, it tells me that the query succeeded and that
> four records were updated, which is what I expect.  But when I looked at the
> inventory table, I found that the four records were unchanged.  So, I tried
> to check the values of the base coordinates by running the select statement
> shown above.  That statement threw an error complaining that x_coordinate
> and y_coordinate did not exist.  This is correct; I should have been
> querying a view that includes those fields.  But why didn’t the update
> statement throw an error?

Because inventory contains those fields.

-- 
If you can't see the forest for the trees,
Cut the trees and you'll see there is no forest.


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