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MySQL - UPDATE query based on SELECT Query
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You can actually do this one of two ways:
MySQL update join syntax:
UPDATE tableA a
INNER JOIN tableB b ON a.name_a = b.name_b
SET validation_check = if(start_dts > end_dts, 'VALID', '')
-- where clause can go here
ANSI SQL syntax:
UPDATE tab...
How do I disable fail_on_empty_beans in Jackson?
...r class, try @JsonSerialize above class declaration.
For a mapper, here's one example:
ObjectMapper mapper = new ObjectMapper();
mapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
// do various things, perhaps:
String someJsonString = mapper.writeValueAsString(someClassInstance);
S...
Using @property versus getters and setters
...ey are syntactically identical to attribute access, so you can change from one to another without any changes to client code. You could even have one version of a class that uses properties (say, for code-by-contract or debugging) and one that doesn't for production, without changing the code that u...
When should I use a struct rather than a class in C#?
...ly large) are more expensive to pass around than class references (usually one machine word), so classes could end up being faster in practice.
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Stopping scripters from slamming your website
...he CAPTCHAs?
If you're using the site normally, you'll probably never see one. If you happen to reload the same page too often, post successive comments too quickly, or something else that triggers an alarm, make them prove they're human. In your case, this would probably be constant reloads of the...
How to call one shell script from another shell script?
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What are their differences? Why one, why another?
– rocketspacer
Mar 14 '17 at 21:39
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LINQ to Entities does not recognize the method 'System.String ToString()' method, and this method ca
I'm migrating some stuff from one mysql server to a sql server but i can't figure out how to make this code work:
11 Answer...
Optimistic vs. Pessimistic locking
...the differences between optimistic and pessimistic locking. Now could someone explain to me when I would use either one in general?
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A simple explanation of Naive Bayes Classification
... hard to understand the process of Naive Bayes, and I was wondering if someone could explain it with a simple step by step process in English. I understand it takes comparisons by times occurred as a probability, but I have no idea how the training data is related to the actual dataset.
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