大约有 41,000 项符合查询结果（耗时：0.0319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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Overriding == operator. How to compare to null? [duplicate]
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ReferenceEquals emits a method call though, while casting to object will cause the compiler to just emit instructions to compare the references for equality. ... But that probably counts as evil micro-optimization.
– dtb
Nov 18 '10 at 2...
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...
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...
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
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Is there a way to instantiate a class by name in Java?
... hi, once we have created the object from newInstance(), could we cast it back to our own object?
– GMsoF
Mar 14 '14 at 2:55
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What is the 'dynamic' type in C# 4.0 used for?
...me. Think of it as being able to interact with an Object without having to cast it.
dynamic cust = GetCustomer();
cust.FirstName = "foo"; // works as expected
cust.Process(); // works as expected
cust.MissingMethod(); // No method found!
Notice we did not need to cast nor declare cust as type Cus...
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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Generate random int value from 3 to 6
...CLARE @maxval TINYINT, @minval TINYINT
select @maxval=24,@minval=5
SELECT CAST(((@maxval + 1) - @minval) *
RAND(CHECKSUM(NEWID())) + @minval AS TINYINT)
And that was taken directly from this link, I don't really know how to give proper credit for this answer.
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How to convert float to int with Java
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why is the typecast needed after Math.round()?
– necromancer
Jun 9 '12 at 1:51
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