Question

I am occasionally forced to use MS-SQL, so my knowledge of it is basic. I’m sure the following problem is piece of cake for an MS-SQL expert, but for me this looks really like a nasty bug:

Say I have a simple table containing a person’s last name, first name, and email, like this:

CREATE TABLE dbo.people
(
lastName varchar(50) NULL,
firstName varchar(50) NULL,
email varchar(50) NULL
)

Now I’m going to create a view so I have some pre-concated fields, like this:

CREATE VIEW v_people AS
SELECT
    people.*,
    people.lastName + ' ' + people.firstName AS concatName
FROM people

Now I notice that I forgot the Phone number field, and alter the original table, but ONLY the table, NOT the view:

ALTER TABLE dbo.people ADD
phone varchar(50) NULL

Cool, also works. But what now happened to the view is quite horrible: The view field ‘concatName’ does not contain the concated names, but the Phone Numbers, even if the view fields are STILL the same amount and names!

It seems that MS-SQL is just moving the data columns within the view without updating the column definitions. Quite horrible scenario, if you forget to update views that depends on tables you alter…

Do I have overseen something, or am I really responsible for always checking / altering all the views if I just add a new table column? Is there a way to let the MS-SQL server at least throw a warning about depending views?

I noticed that it does not happen if the view is constructed like this:

CREATE VIEW v_people AS
SELECT
    people.lastName + ' ' + people.firstName AS concatName,
    people.*
FROM people

But for me this just looks like a nasty workaround….

Any hints?

Answer 1

You need to call sp_refreshview 'YourView' after altering the definition of tables selected from with *.