I have a single row in a table variable that looks like this:
CanEdit | CanView | CanAdd | CanDelete
All columns are bit fields. I need to convert this table to a comma-delimited string like the following:
If the user has true for each column... E,V,A,D
If the user only has Edit and Add... E,A
How can I do this?
As it's a fixed set, it can be done directly as follows.
SUBSTRING(
CASE WHEN CanEdit = 1 THEN ',E' ELSE '' END
+ CASE WHEN CanView = 1 THEN ',V' ELSE '' END
+ CASE WHEN CanAdd = 1 THEN ',A' ELSE '' END
+ CASE WHEN CanDelete = 1 THEN ',D' ELSE '' END,
2,
7
)
That said, it is very rare that this is recommended.
If you are refactoring your data, this is reversing the atomicity of your data and is considered a fundamentally problematic anti-pattern in SQL.
If you are doing this for presentation in a client, doing this in SQL couples your data layer and presentation layer, another anti-pattern.
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