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Select count(*) from multiple tables
How can I select count(*) from two different tables (call them tab1 and tab2 ) having as result:
18 Answers
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IntelliJ and Tomcat…changed files are not automatically recognized by Tomcat
...r "Update resources" or "Update Classes and Resources"
Update resources: All changed resources (that is, all application components other than the classes) will be updated.
Update classes and resources: All changed resources will be updated; changed classes will be recompiled. Note that whether th...
How to force maven update?
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mvn clean install -U
-U means force update of snapshot dependencies. Release dependencies can't be updated this way.
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IntelliJ IDEA jump from interface to implementing class in Java
Is there some shortcut that would allow me after creating method in an interface, select and jump to implementing class of that interface?
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How does one use rescue in Ruby without the begin and end block
... Inline rescue is not a good practice as it rescues StandardError and all its subclasses, like NameError – meaning that even a typo in your code won't raise an error.. See thoughtbot.com/blog/don-t-inline-rescue-in-ruby.
– BrunoFacca
Sep 19 '19 at 18:25
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What is a “surrogate pair” in Java?
...encoding, characters are mapped to values between 0x0 and 0x10FFFF.
Internally, Java uses the UTF-16 encoding scheme to store strings of Unicode text. In UTF-16, 16-bit (two-byte) code units are used. Since 16 bits can only contain the range of characters from 0x0 to 0xFFFF, some additional complex...
How do I list all tables in a schema in Oracle SQL?
How do i list all tables in a schema in Oracle SQL?
14 Answers
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To find whether a column exists in data frame or not
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all(c("d", "e", "f") %in% colnames(dat))
– skan
Jul 28 '17 at 19:59
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differences between 2 JUnit Assert classes
...d junit.framework.Assert itself and your test class gained the ability to call the assert methods this way.
Since version 4 of JUnit, the framework uses Annotations for marking tests. So you no longer need to extend TestCase. But that means, the assert methods aren't available. But you can make a s...
Is there a Newline constant defined in Java like Environment.Newline in C#?
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In Android, call also requires API 19
– Hamzeh Soboh
Apr 12 '15 at 10:31
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