You should be able to do something like this with a writable CTE:
WITH i AS (
INSERT INTO host (hostname, hostrole) VALUES ('foobar', 'Virtual') RETURNING id
)
INSERT INTO interface (name, mac, host)
SELECT 'eth0', '00:50:56:9d:34:d4', id
FROM i
(untested, but it should be something like that)
Writable CTE is in PostgreSQL 9.1 and up.
If I understand your requirements correctly....
I would just use the natural key, LanguageCode-CultureCode ("en-US," for example). It's small enough. (I'm using the entire "en-US" as the primary key to differentiate it from "en-GB," for example.)
CREATE TABLE [dbo].[Language](
[Language] [char](2) NOT NULL,
[Culture] [char](2) NOT NULL,
[LanguageCode] AS (([Language]+'-')+[Culture]) PERSISTED NOT NULL,
CONSTRAINT [PK_Language] PRIMARY KEY CLUSTERED
(
[Language] ASC,
[Culture] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY],
CONSTRAINT [LanguageCode] UNIQUE NONCLUSTERED
(
[LanguageCode] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
CREATE TABLE [dbo].[Language_Text](
[LanguageID] [varchar](5) NOT NULL,
[LanguageCode] [varchar](5) NOT NULL,
[LanguageName] [nvarchar](20) NULL,
CONSTRAINT [PK_Language_Text] PRIMARY KEY CLUSTERED
(
[LanguageID] ASC,
[LanguageCode] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
ALTER TABLE [dbo].[Language_Text] WITH CHECK ADD CONSTRAINT [FK_Language_Text_Language] FOREIGN KEY([LanguageCode])
REFERENCES [dbo].[Language] ([LanguageCode])
GO
ALTER TABLE [dbo].[Language_Text] CHECK CONSTRAINT [FK_Language_Text_Language]
GO
This should allow you to get all articles in en or sv, and you can also query for en-US or sv-SE. Presumably, although it wasn't in your example, you could also query for en-CA, fr-CA, en, fr, or CA.
Edit--I'm sorry, you're right, no search by Culture in my old code. Revamped above, sorry. Here's a sample of content:
Language:
Language-Culture-LanguageCode
en US en-US
sv SE sv-SE
Language_Text:
LanguageID-LanguageCode-LanguageName
en-US en-US English
en-US sv-SE Engelska
sv-SE en-US Swedish
sv-SE sv-SE Svenska
Searching by Culture (Canada):
SELECT test.dbo.Language_Text.LanguageID, test.dbo.Language_Text.LanguageCode, test.dbo.Language_Text.LanguageName
FROM test.dbo.Language_Text INNER JOIN
test.dbo.Language ON test.dbo.Language_Text.LanguageID = test.dbo.Language.LanguageCode
WHERE (test.dbo.Language.Culture = 'CA')
Searching by Language (French):
SELECT test.dbo.Language_Text.LanguageID, test.dbo.Language_Text.LanguageCode, test.dbo.Language_Text.LanguageName
FROM test.dbo.Language_Text INNER JOIN
test.dbo.Language ON test.dbo.Language_Text.LanguageID = test.dbo.Language.LanguageCode
WHERE (test.dbo.Language.Language = 'fr')
Searching by LanguageCode (Swedish):
SELECT LanguageName
FROM [test].[dbo].[Language_Text]
where (LanguageID = 'sv-SE')
Best Answer
Let the database generate it for you (identity column, 12c feature):
If you are still on a version below 12c, then you can simply use
rownum
:Or a sequence:
Or a trigger, as described here: https://stackoverflow.com/questions/11296361/how-to-create-id-with-auto-increment-on-oracle