大约有 30,000 项符合查询结果(耗时:0.0621秒) [XML]

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Convert Rows to columns using 'Pivot' in SQL Server

...defined above logic with the @cols and @query ... there is an error.` Invalid object name 'cte3'.` how do you fix that. – – Elizabeth Mar 1 '16 at 18:59 3 ...
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Strings as Primary Keys in SQL Database [closed]

...scule to the headaches that you can have by having an integer that doesn't mean anything in relation to the data. share | improve this answer | follow | ...
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Mercurial move changes to a new branch

...add file b | o changeset: 0:d554afd54164 summary: initial This means, revision 0 is the base on which you started to work on your feature. Now you want to have revisions 1-2 on a named branch, let's say my-feature. Update to revision 0 and create that branch: $ hg up 0 $ hg branch my-fe...
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Sequence contains more than one element

...SingleOrDefault" - from what I can gather the OP is looking for a customer id which (I assume) should be unique, therefore, SingleOrDefault is actually more appropriate than FirstOrDefault. Also, this has actually raised a more serious problem with the OP's database design as it shows that it is pos...
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Functional programming vs Object Oriented programming [closed]

..., close, resize) and a growing number of widgets. Of course, this does not mean that OOP is better than procedural for any application, as you illustrated. – Giorgio Jan 9 '15 at 17:54 ...
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Java generics type erasure: when and what happens?

...trieve full compile-time type information at runtime which, in other words means: reified generics. This means that the compiler does not throw away type information when anonymous classes are involved; this information is kept in the generated binary code and the runtime system allows you to retrie...
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jQuery Get Selected Option From Dropdown

Usually I use $("#id").val() to return the value of the selected option, but this time it doesn't work. The selected tag has the id aioConceptName ...
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Why Java needs Serializable interface?

... @McDowell what do you mean by persisted form of classes ? I followed that link but can't understand what you mean ? can you explain this please ? – Geek Aug 22 '12 at 7:36 ...
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memory_get_peak_usage() with “real usage”

...r Google Mail might have allocated 25MB of storage for you but it does not mean that is what you have used at the moment. This is exactly what the PHP doc was saying Set this to TRUE to get the real size of memory allocated from system. If not set or FALSE only the memory used by emalloc() is r...
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SQLite table constraint - unique on multiple columns

... adding UNIQUE(i, j) to the create statement is completely ignored on android. It creates the table, but leaves off the UNIQUE constraint. I was only able to do this by using an index. – gattsbr Aug 11 at 14:55 ...