unav | GPS Navigator for Ubuntu Touch
kandi X-RAY | unav Summary
kandi X-RAY | unav Summary
GPS Navigator for Ubuntu Touch
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QUESTION
I'm still a relative novice when it comes to designing SQL databases, so apologies if this is something obvious that I'm missing.
I have a few tables of controlled vocabularies for certain values that I'm representing as FKs referencing the controlled vocab tables (there are few distinct vocabularies I'm trying to represent). My schema specification allows each of these vocabularies to also allow a controlled set of values for "unknown" information (coming from DataCite). Here is an example using a table dates
that must specify a date_type
, which should be either a value from date_types
or unknown_values
. I have a few more tables with this model as well, each with their own specific controlled vocabularies, but should also allow values from unknown_values
. So the values in unknown_values
should be shared among many tables of controlled vocabularies with similar structure to date_types
.
ANSWER
Answered 2022-Mar-24 at 18:15What you are requesting is the ability for a FK to have optional referenced table. Also as discovered Postgres nor SQLite(?) provides this option (afaik neither does any other RDBMS). Postgres at lease offers a work around, I do not know it its doable in SQLite. You need to:
- drop the not null constraint on the currently defined FK
- add a FK column referencing the
unknown_values
table - add
check
constraint that requires exactly 1 on the columnsdate_type
and the new FK column to be null. See the num_nulls function.
Changes you need: ( see demo )
QUESTION
I have a problem with a server-client project. The server is a ASP MVC project, and the client is an Angular project. When I deploy my server project through IIS and browse it, I get this:
I have installed on my angular project the packages Tadman suggested on this post but unsuccessfully. I have tried to use old published versions of my site but the result is the same. My client project contains the favicon.ico
file in its src folder.
How could I solve it?
ANSWER
Answered 2022-Feb-18 at 07:42If anyone encounters this error, I managed to get rid of the it by creating a new site in IIS with the same publish source as the old one.
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