大约有 45,000 项符合查询结果(耗时:0.0505秒) [XML]

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How to set a default value for an existing column

...able and found this way to check if it had been done already... IF EXISTS(SELECT * FROM information_schema.columns WHERE table_name='myTable' AND column_name='myColumn' AND Table_schema = 'myDBO' AND column_default IS NULL) BEGIN ALTER TABLE [myDBO].[myTable] ADD DEFAULT 0 FOR [myColumn] END ...
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Why is this F# code so slow?

...C# and F#. The C# version is 10 times faster for two strings of about 1500 chars. C#: 69 ms, F# 867 ms. Why? As far as I can tell, they do the exact same thing? Doesn't matter if it is a Release or a Debug build. ...
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What is this: [Ljava.lang.Object;?

... name consists of the name of the element type preceded by one or more '[' characters representing the depth of the array nesting. The encoding of element type names is as follows: Element Type Encoding boolean Z byte B char C double D...
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What Java ORM do you prefer, and why? [closed]

...ay give jOOQ a try. You'll love it! :-) Check out this example SQL: // Select authors with books that are sold out SELECT * FROM T_AUTHOR a WHERE EXISTS (SELECT 1 FROM T_BOOK WHERE T_BOOK.STATUS = 'SOLD OUT' AND T_BOOK.AUTHOR_ID ...
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Check a radio button with javascript

... Technically it's CSS selector syntax. jQuery just borrowed and extended it – Tim Seguine Jan 16 '14 at 16:10 ...
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XPath to select multiple tags

...l-name()='e'] is both too-long and incorrect. This XPath expression will select nodes like: OhMy:c NotWanted:d QuiteDifferent:e share | improve this answer | follow ...
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What is the difference between Scope_Identity(), Identity(), @@Identity, and Ident_Current()?

...ction is not used to get an identity, it's used to create an identity in a select...into query. The session is the database connection. The scope is the current query or the current stored procedure. A situation where the scope_identity() and the @@identity functions differ, is if you have a trig...
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How to return result of a SELECT inside a function in PostgreSQL?

... bigint , ratio bigint) AS $func$ BEGIN RETURN QUERY SELECT t.txt , count(*) AS cnt -- column alias only visible inside , (count(*) * 100) / _max_tokens -- I added brackets FROM ( SELECT t.txt FROM token t WHERE t.charty...
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LINQ to SQL Left Outer Join

...table), where-as yours matches only 0-1. To do a left outer join, you need SelectMany and DefaultIfEmpty, for example: var query = from c in db.Customers join o in db.Orders on c.CustomerID equals o.CustomerID into sr from x in sr.DefaultIfEmpty() s...
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How to tell Xcode where my info.plist and .pch files are

...g to add my discoveries here as it is slightly different for Xcode 4.2: Select your project In the left side of the middle pane, select your app under "Targets" Select the tab "Build Settings" Search the following keywords: "info.plist" and "pch" At this point it should be pretty clear which are ...