大约有 47,000 项符合查询结果(耗时:0.0858秒) [XML]

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CASCADE DELETE just once

... with the ON DELETE CASCADE rule. Is there any way I can perform a delete and tell Postgresql to cascade it just this once? Something equivalent to ...
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conditional unique constraint

...onstraint like this. The difference is, you'll return false if Status = 1 and Count > 0. http://msdn.microsoft.com/en-us/library/ms188258.aspx CREATE TABLE CheckConstraint ( Id TINYINT, Name VARCHAR(50), RecordStatus TINYINT ) GO CREATE FUNCTION CheckActiveCount( @Id INT ) RETURNS INT...
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Alternatives to gprof [closed]

...used in the presence of mutual recursion. But the visualizer is very nice and light years ahead of gprof. share | improve this answer | follow | ...
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XML serialization in Java? [closed]

...ntation lives at http://jaxb.java.net/ 2018 Update Note that the Java EE and CORBA Modules are deprecated in SE in JDK9 and to be removed from SE in JDK11. Therefore, to use JAXB it will either need to be in your existing enterprise class environment bundled by your e.g. app server, or you will ne...
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Sort points in clockwise order?

...e other. Using it you can construct a less-than relation to compare points and determine the order in which they should appear in the sorted array. But you have to define where is the beginning of that order, I mean what angle will be the starting one (e.g. the positive half of x-axis). The code fo...
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how to use sed, awk, or gawk to print only what is matched?

I see lots of examples and man pages on how to do things like search-and-replace using sed, awk, or gawk. 11 Answers ...
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What is a loop invariant?

... @Tomas Petricek - when the loop terminates, i = 10 and j = -1; so the weaker invariant example you gave may not be correct (?) – Raja Apr 7 '12 at 22:47 7 ...
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How to skip over an element in .map()?

...tion would have kept it. update — This question gets a lot of attention, and I'd like to add the following clarifying remark. The purpose of .map(), as a concept, is to do exactly what "map" means: transform a list of values into another list of values according to certain rules. Just as a paper m...
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What does .SD stand for in data.table in R

...ks useful but I do not really know what I am doing with it. What does it stand for? Why is there a preceding period (full stop). What is happening when I use it? ...
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Write a function that returns the longest palindrome in a given string

...ng Manacher's Algorithm in O(n) time! Its implementation can be found here and here. For input String s = "HYTBCABADEFGHABCDEDCBAGHTFYW1234567887654321ZWETYGDE" it finds the correct output which is 1234567887654321. share ...