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Select statement to find duplicates on certain fields
...ight solve your problem.
SELECT A.ID, A.field1, A.field2, A.field3
FROM myTable A
WHERE EXISTS (SELECT B.ID
FROM myTable B
WHERE B.field1 = A.field1
AND B.field2 = A.field2
AND B.field3 = A.field3
AND B.ID <...
How to find corresponding log files folder for a web site?
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Obvious to some and not to others (myself), the Site Id can only be a number, not alphanumeric characters.
– Mario Tacke
Oct 24 '14 at 16:01
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Convert pandas dataframe to NumPy array
...nd a bit with the dtypes if they are not what you want from the get go. In my case, having copied your DF from a string, the index type is string (represented by an object dtype in pandas):
In [102]: df
Out[102]:
label A B C
ID
1 NaN 0.2 NaN
2 NaN NaN 0.5
3...
Using multiple property files (via PropertyPlaceholderConfigurer) in multiple projects/modules
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I tried the solution below, it works on my machine.
<context:property-placeholder location="classpath*:connection.properties" ignore-unresolvable="true" order="1" />
<context:property-placeholder location="classpath*:general.properties" order="2"/>
...
Advantages and disadvantages of GUID / UUID database keys
...like index fragmentation. But those are easilly solvable (comb guids by jimmy nillson: http://www.informit.com/articles/article.aspx?p=25862 )
Edit merged my two answers to this question
@Matt Sheppard I think he means that you can duplicate rows with different GUIDs as primary keys. This is an is...
How do I test which class an object is in Objective-C?
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My understanding is that this only works for objects that inherit NSObject.
– Henrik P. Hessel
Jul 9 '11 at 19:39
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Unsigned keyword in C++
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Thank you! English is not my first language and I was baffled with the meaning of the unsigned data type. Whose signature does it contain? It never occurred to me that it could be from the noun sign... :D
– user74200
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How do I get SUM function in MySQL to return '0' if no values are found?
Say I have a simple function in MySQL:
4 Answers
4
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CPU Privilege Rings: Why rings 1 and 2 aren't used?
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In my mind, there is little overhead to switching modes. From what I understand, only hardware could assign more privileged privileges to the cpu (like if an IO-finished interrupt occurred). If this privilege switching happens i...
Following git-flow how should you handle a hotfix of an earlier release?
... extended) then it is as successful as its author states. Please check out my answer to the topic we are discussing.
– Victor Yarema
Aug 2 '16 at 13:09
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