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Posted by / 02-Dec-2019 19:21

Functions, variables, constants, non computed column names or any combination of all these may be used along with operators to create a computed column.

In this tip we will go through an example of implementing a computed column.

Persisted You may have noticed that we also used the property "Persisted" for our computed column.

This property for computed columns has been introduced in SQL Server 2005 and onwards.

Provide specifications for the calculated column as shown below.

Now we have our table CCtest with a computed column.

I have tried to figure it out by either updating a temp table I create, or adding the value during the SELECT INTO statement.

The purpose of this table is to store a record of the historic updates to a case, identified by the --------------------------------- | case_id | modify_time | --------------------------------- | 1 | 2015-05-01 | | 1 | 2015-05-02 | | 1 | 2015-05-03 | | 2 | 2015-05-01 | | 2 | 2015-05-01 | | 3 | 2015-05-02 | --------------------------------- ------------------------------------------- | case_id | modify_time | version | ------------------------------------------- | 1 | 2015-05-01 | 1 | | 1 | 2015-05-02 | 2 | | 1 | 2015-05-03 | 3 | | 2 | 2015-05-01 | 1 | | 2 | 2015-05-01 | 2 | | 3 | 2015-05-02 | 1 | ------------------------------------------- value changes.

CCTest GO Here we can see our computed column has been updated.

I have tested the scripts on SQL Server 2005 and SQL Server 2008.

In the following script we will create a table called CCtest in the Adventure Works database with three columns [emp Numb], [DOBirth] , [DORetirement].

:-( This is on SQL Server 2012 and I am not afraid to try anything no matter how advanced as I can only learn from this exercise.

Thank you for taking the time to view my question and thank you in advance if you can help me out here. But since you could also generate that version column on the fly every time you need to query (maybe it could be in a view), I don't see any benefit of storing the output or even having a version column in the table, since you are potentially going to be updating it more often than you read it (you will have to update entire ranges or even the entire table every time any rows are changed or added).

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It is important for any computed column, because many additional features depend on it.