calculated-columns

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How to change a normal column to "computed" column

I ha开发者_运维技巧ve a table in MSSQL server 2008. I would like to change one of the column in that table to computed column. Could somebody tell me how do I do that ?Preserve the old data:[详细]

2023-03-22 06:06 分类：问答
Access SQL computed columns through ActiveRecord

I have a Person model, which includes a property representing the data of birth (birth_date). I also have a method called age(), which works out the current age of the person.[详细]

2023-03-21 10:06 分类：问答
SharePoint 2010 Views / Date Comparison Problem

I\'m using Sharepoint 2010 Enterprise and I\'m trying to create a view which seems like it should be pretty simple.It is based on the task list:[详细]

2023-03-19 14:29 分类：问答
Computed column based on nullable columns

I want to create a computed column that is the concatenation of several other columns.In the below example, fulladdress is null in the result set whe开发者_如何学运维n any of the \'real\' columns is n[详细]

2023-03-17 18:50 分类：问答
Microsoft Access: How to do IF in Calculated Field Expression?

I want my calculated field to have a conditional value like this: if fieldA is 0 then set fieldC to 0 else field C = fieldB开发者_Python百科 / fieldA[详细]

2023-03-10 21:11 分类：问答
Entity Framework persisted computed column woes

I recently updated a computed column to be persisted due to poor performance when querying it. However now updates to child records throw this error[详细]

2023-03-10 11:52 分类：问答
Computed columns or store

I need a couple of computed columns that contain count totals (indexed columns). Do you think it is better to use a computed column in a view or add extra columns to the table that will store the tota[详细]

2023-03-08 06:05 分类：问答
Automatic Field Update/ Calculated Field

I\'ve been trying to find out if the following scenario is possible, I\'ll do my best to describe! Table - trespondent[详细]

2023-03-07 20:15 分类：问答
Updating computed columns

I sql databas开发者_运维技巧e and it has a table which has got five columns and two of which computed columns, the table acts as a datasource for the datagridview control. The problem I am having is t[详细]

2023-03-07 03:10 分类：问答
Why does the Execution Plan include a user-defined function call for a computed column that is persisted?

I have a table with 2 computed columns, both of which has \"Is Persisted\" set to true. However, when using them in a query the Execution Plan shows the UDF used to compute the columns as part of the[详细]

2023-03-06 01:01 分类：问答