大约有 2,253 项符合查询结果（耗时：0.0112秒） [XML]
How to select rows that have current day's timestamp?
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Simply cast it to a date:
SELECT * FROM `table` WHERE CAST(`timestamp` TO DATE) == CAST(NOW() TO DATE)
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How to see query history in SQL Server Management Studio
...TraceID OUTPUT, 2, N'Y:\TraceFile.trc'
print 'This trace is Trace ID = ' + CAST(@TraceID AS NVARCHAR)
print 'Return value = ' + CAST(@RetVal AS NVARCHAR)
-- 10 = RPC:Completed
exec sp_trace_setevent @TraceID, 10, 1, @ON -- Textdata
exec sp_trace_setevent @TraceID, 10, 3, @ON -- DatabaseID
ex...
Why can't C compilers rearrange struct members to eliminate alignment padding? [duplicate]
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I accept type casting argument. However I'm not sure I see the problems with optimization. I was just thinking that the compiler could treat the struct exactly as if I had written it in ordered form myself. Sure there are cases where we ca...
Double Negation in C++
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I think cast it explicitly with (bool) would be clearer, why use this tricky !!, because it is of less typing?
– Baiyan Huang
Mar 29 '10 at 3:39
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Creating anonymous objects in php
...w stdClass;
$obj->aProperty = 'value';
You can also take advantage of casting an array to an object for a more convenient syntax:
$obj = (object)array('aProperty' => 'value');
print_r($obj);
However, be advised that casting an array to an object is likely to yield "interesting" results fo...
Object-orientation in C
...t member of a structure be an instance of the superclass, and then you can cast around pointers to base and derived classes freely:
struct base
{
/* base class members */
};
struct derived
{
struct base super;
/* derived class members */
};
struct derived d;
struct base *base_ptr = (s...
What are the differences between Generics in C# and Java… and Templates in C++? [closed]
...tOfPerson.
The benefit of this is that it makes it really fast. There's no casting or any other stuff, and because the dll contains the information that this is a List of Person, other code that looks at it later on using reflection can tell that it contains Person objects (so you get intellisense a...
Real life example, when to use OUTER / CROSS APPLY in SQL
... doubled_number_plus_one
FROM master..spt_values
CROSS APPLY (SELECT 2 * CAST(number AS BIGINT)) CA1(doubled_number)
CROSS APPLY (SELECT doubled_number + 1) CA2(doubled_number_plus_one)
4) Unpivoting more than one group of columns
Assumes 1NF violating table structure....
CREATE TABLE T
...
Converting java.util.Properties to HashMap
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The efficient way to do that is just to cast to a generic Map as follows:
Properties props = new Properties();
Map<String, String> map = (Map)props;
This will convert a Map<Object, Object> to a raw Map, which is "ok" for the compiler (only warning)....
Generate a random number in the range 1 - 10
...rns the same data type as the input (as stated in the manual). You need to cast the result to an integer: trunc(random() * 20)::int
– a_horse_with_no_name
Oct 5 '11 at 17:35
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