大约有 2,253 项符合查询结果（耗时：0.0267秒） [XML]
What is an existential type?
...ely become opaque; perhaps the only thing you can still do with it is type-cast it to Object.
Summary:
===========================================================
| universally existentially
| quantified type quantified type
------------------...
Postgres manually alter sequence
...But if you feed typed variables to the function you may need explicit type casts to satisfy function type resolution. Like:
SELECT setval(my_text_variable::regclass, my_other_variable::bigint, FALSE);
For repeated operations you might be interested in:
ALTER SEQUENCE payments_id_seq START WITH...
Function to Calculate Median in SQL Server
...Data
group by percentile)
select
case
when b.percentile = 10 then cast(b.high as decimal(18,2))
else cast((a.low + b.high) as decimal(18,2)) / 2
end as [value], --b.high, a.low,
b.percentile
from MinimaAndMaxima a
join MinimaAndMaxima b on (a.percentile -1 = b.percentile) or ...
Receive result from DialogFragment
...t will not working after save and restore dialog fragment state. LocalBroadcastManager is best solution in this case.
– Nik
Aug 10 '16 at 12:50
4
...
Why unsigned integer is not available in PostgreSQL?
...pret strings as literals, just write '4294966272'::uint4 as your literals. Casts shouldn't be a huge deal either. You don't even need to do range exceptions, you can just treat the semantics of '4294966273'::uint4::int as -1024. Or you can throw an error.
If I wanted this, I would have done it. But...
How to see the CREATE VIEW code for a view in PostgreSQL?
...
@elias: just use the version that uses an OID by casting the name to an oid: select pg_get_viewdef('viewname'::regclass, true)
– a_horse_with_no_name
Jan 31 '13 at 20:44
...
Is it safe to use -1 to set all bits to true?
...
@litb: casting -1 is certainly a nice way to get maximal unsigned values, but it's not really descriptive; that's the reason why the _MAX constants exist (SIZE_MAX was added in C99); granted, the C++ version numeric_limits<size_t...
Why is there no multiple inheritance in Java, but implementing multiple interfaces is allowed?
...
@curiousguy: If a framework provides that casting an object reference to a base-type reference will be identity preserving, then every object instance must have exactly one implementation of any base-class method. If ToyotaCar and HybridCar both derived from Car and...
Select distinct values from a table field
...t('city').distinct()
This one returns a ValuesListQuerySet which you can cast to a list.
You can also add flat=True to values_list to flatten the results.
See also: Get distinct values of Queryset by field
share
...
Why does int i = 1024 * 1024 * 1024 * 1024 compile without error?
...
Right. Assigning an int to a long includes an implicit cast. But the value can never exist as the int in the first place to get casted :)
– Cruncher
Jul 11 '14 at 18:14
...