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Get table column names in MySQL?
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+1 I wanted to select table names where a column exist I did SELECT TABLE_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = 'db_name' AND COLUMN_NAME = 'col_name';
– AL̲̳I
May 22 '14 at 10:01
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How to define “type disjunction” (union types)?
..."str")
case _: Int => println("int")
}
}
And that's it. You can call foo(5) or foo("abc"), and it will work, but try foo(true) and it will fail. This could be side-stepped by the client code by creating a StringOrInt[Boolean], unless, as noted by Randall below, you make StringOrInt a seal...
不同品牌的防火墙组成高可靠性集群 - 更多技术 - 清泛网 - 专注C/C++及内核技术
... 18:27 pts/1 00:00:00 grep zebra
[root@RS1 ~]# lsof -i:2601
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
zebra 3919 root 10u IPv4 19685 0t0 TCP *:discp-client (LISTEN)
[root@RS1 ~]#
*:discp-client (LISTEN)
zebra-0.95a安装好后会自动往系统/etc/servics...
Pandas convert dataframe to array of tuples
...you want normal tuples in your zip iterator (instead of namedtuples), then call: data_set.itertuples(index=False, name=None)
– Axel
Oct 25 '17 at 9:47
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Java: How to Indent XML Generated by Transformer
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@lapo if your provider is xalan (which it probably is if this works), then it's available as org.apache.xml.serializer.OutputPropertiesFactory.S_KEY_INDENT_AMOUNT
– OrangeDog
May 14 '19 at 17:10
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ImportError: No module named six
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I have no idea why some python module incorrectly list their dependencies. Maybe the author do not test installing the module in a chroot to validate the dependencies are correct.
– Sylvain Defresne
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How do I declare and initialize an array in Java?
...d in the enclosing scope (function or whatever). After returning it to the caller, it is no longer valid. Using the new keyword you allocate the new object from the heap and it is valid outside the defining scope.
– teukkam
Oct 18 '16 at 9:55
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Remove all the elements that occur in one list from another
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Python has a language feature called List Comprehensions that is perfectly suited to making this sort of thing extremely easy. The following statement does exactly what you want and stores the result in l3:
l3 = [x for x in l1 if x not in l2]
l3 will c...
Differences between strong and weak in Objective-C
...er the case, the object gets destroyed and your weak property will automatically get set to nil. The most frequent use cases of weak references in iOS are:
delegate properties, which are often referenced weakly to avoid retain cycles, and
subviews/controls of a view controller's main view because ...
How to run a shell script at startup
On an Amazon S3 Linux instance, I have two scripts called start_my_app and stop_my_app which start and stop forever (which in turn runs my Node.js application). I use these scripts to manually start and stop my Node.js application. So far so good.
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