大约有 13,072 项符合查询结果(耗时:0.0246秒) [XML]

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Use the new keyword if hiding was intended” warning

... Your class has a base class, and this base class also has a property (which is not virtual or abstract) called Events which is being overridden by your class. If you intend to override it put the "new" keyword after the public ...
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How do I modify a MySQL column to allow NULL?

... You want the following: ALTER TABLE mytable MODIFY mycolumn VARCHAR(255); Columns are nullable by default. As long as the column is not declared UNIQUE or NOT NULL, there shouldn't be any problems. ...
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Alter Table Add Column Syntax

I'm trying to programmatically add an identity column to a table Employees. Not sure what I'm doing wrong with my syntax. 4...
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Difference between this and self in self-type annotations?

In various Scala literature I see some self-type annotations using "this" and others using "self": 2 Answers ...
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String.Join method that ignores empty strings?

...method String.Join(separator, stringArray) is similar to PHP's implode, but any null elements in the array are replaced with an empty string, so thatc: ...
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Differences between utf8 and latin1

what is the difference between utf8 and latin1? 2 Answers 2 ...
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How to force a view refresh without having it trigger automatically from an observable?

Note: this is mostly for debugging and understanding KnockoutJS. 3 Answers 3 ...
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differences between 2 JUnit Assert classes

The JUnit framework contains 2 Assert classes (in different packages, obviously) and the methods on each appear to be very similar. Can anybody explain why this is? ...
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How do I set a column value to NULL in SQL Server Management Studio?

How do I clear the value from a cell and make it NULL? 6 Answers 6 ...
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How do I convert an interval into a number of hours with postgres?

... answered Jun 4 '09 at 19:23 Magnus HaganderMagnus Hagander 19.6k33 gold badges4848 silver badges4141 bronze badges ...