大约有 31,500 项符合查询结果（耗时：0.0642秒） [XML]
Postgres and Indexes on Foreign Keys and Primary Keys
..., *, 1 as issue_sort
FROM fk_index_match
WHERE indexid IS NULL
UNION ALL
SELECT 'questionable index' as issue, *, 2
FROM fk_index_match
WHERE indexid IS NOT NULL
AND fkoid NOT IN (
SELECT fkoid
FROM fk_perfect_match)
),
parent_table_stats AS (
...
Can enums be subclassed to add new elements?
... no.
As an example of a real problem take weekdays, weekend days and, the union, days of week. We could define all days within days-of-week but then we would not be able to represent properties special to either weekdays and weekend-days.
What we could do, is have three enum types with a mapping b...
How to see query history in SQL Server Management Studio
... filters: */
-- AND (s.name IN ('<myschema>') OR s.name IS NULL)
UNION
SELECT NULL,NULL,NULL,NULL,NULL,NULL,dt,NULL,NULL,NULL,NULL,NULL,NULL, NULL
FROM #lastendtime
)
SELECT * FROM T
WHERE T.query_sql_text IS NULL OR T.query_sql_text NOT LIKE '%#lastendtime%' -- do not show myself
ORDER BY...
What is the correct way to represent null XML elements?
...le would be elements of type decimal. If you want them to be empty you can union an enumerated string that only allows "" and a decimal, or use a decimal that is nillable.
share
|
improve this answ...
Checking if a double (or float) is NaN in C++
...TH__ macro and switch to a different implementation in that case (e.g. use unions and bit twiddling).
– Adam Rosenfield
Mar 27 '11 at 23:45
|
...
Unnamed/anonymous namespaces vs. static functions
...ve.
Static only applies to names of objects, functions, and anonymous unions, not to type declarations.
Edit:
The decision to deprecate this use of the static keyword (affect visibility of a variable declaration in a translation unit) has been reversed (ref). In this case using a static or a...
What is @ModelAttribute in Spring MVC?
...uest method handler with @ModelAttribute in the arguments. Then we have to union the rules.
Of course we have tons of different situations - @ModelAttribute methods can also be defined in an @ControllerAdvice and so on...
...
C++ semantics of `static const` vs `const`
...red to have external linkage; or
(3.3) — a data member of an anonymous union.
Annex C (informative) Compatibility, C.1.2
Clause 6: "basic concepts" gives the rationale why this was changed from C:
6.5 [also 10.1.7]
Change: A name of file scope that is explicitly declared const, an...
Why can't I forward-declare a class in a namespace using double colons?
...). Essentially, it must be one of class identifier;, struct identifier; or union identifier; where identifer is the common lexical definition in [lex.name]:
identifier:
identifier-nondigit
identifier identifier-nondigit
identifier digit
identifier-nondigit:
nondigit
universal-character-n...
Is there a software-engineering methodology for functional programming? [closed]
... as functions instead, and conversely, representing certain functions as a union of data types instead so that you can get, e.g., serialization, tighter specification, optimization, etc.
Then, given that, you write functions over your adts such that you establish some sort of algebra -- i.e. there ...