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PostgreSQL: Show tables in PostgreSQL
...n, this shows all tables in the current schema:
\dt
Programmatically (or from the psql interface too, of course):
SELECT * FROM pg_catalog.pg_tables;
The system tables live in the pg_catalog database.
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Using group by on multiple columns
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Group By X means put all those with the same value for X in the one group.
Group By X, Y means put all those with the same values for both X and Y in the one group.
To illustrate using an example, let's say we have the following table, to do with who is attending what subject ...
Spring Test & Security: How to mock authentication?
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Seaching for answer I couldn't find any to be easy and flexible at the same time, then I found the Spring Security Reference and I realized there are near to perfect solutions. AOP solutions often are the greatest ones for testing, and...
When to use StringBuilder in Java [duplicate]
It is supposed to be generally preferable to use a StringBuilder for string concatenation in Java. Is this always the case?
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Unable to install Maven on Windows: “JAVA_HOME is set to an invalid directory”
I followed the Maven tutorial to the letter but I still can't get Maven installed on Windows.
16 Answers
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Comparing two collections for equality irrespective of the order of items in them
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It turns out Microsoft already has this covered in its testing framework: CollectionAssert.AreEquivalent
Remarks
Two collections are equivalent if they
have the same elements in the same
quantity, but in any order. Elements
are equal if their values are equal,
not if they ref...
Compare two objects in Java with possible null values
I want to compare two strings for equality when either or both can be null .
12 Answers
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How to do a GitHub pull request
How do I create and/or send a pull request to another repository hosted on GitHub?
8 Answers
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Jenkins / Hudson environment variables
...wed-by/paths/you/want/to/add
If you use the second option, your System Information will still not show it, but your builds will see the added paths.
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