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What exactly are DLL files, and how do they work?
...Dynamic Link Libraries (DLL)s are like EXEs but they are not directly executable. They are similar to .so files in Linux/Unix. That is to say, DLLs are MS's implementation of shared libraries.
DLLs are so much like an EXE that the file format itself is the same. Both EXE and DLLs are based on ...
Is “else if” a single keyword?
... a single keyword if we go to the draft C++ standard section 2.12 Keywords table 4 lists both if and else separately and there is no else if keyword. We can find a more accessible list of C++ keywords by going to cppreferences section on keywords.
The grammar in section 6.4 also makes this clear:
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Select Last Row in the Table
I would like to retrieve the last file inserted into my table. I know that the method first() exists and provides you with the first file in the table but I don't know how to get the last insert.
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C default arguments
...1 creative! It has its limitations but also brings named parameters to the table. Note that, {} (empty initializer) is an error C99.
– u0b34a0f6ae
Oct 29 '11 at 3:45
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Why can't I define a static method in a Java interface?
...h models observed behavior accurately.
Pretend that each class has a hash table that maps method signatures (name and parameter types) to an actual chunk of code to implement the method. When the virtual machine attempts to invoke a method on an instance, it queries the object for its class and loo...
How to get multiple counts with one SQL query?
...(case when level = 'personal' then 1 else 0 end) AS PersonalCount
FROM yourtable
GROUP BY distributor_id
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Array to String PHP?
...e a DB is so you can accomplish work like this trivially. You don't need a table to store arrays, you need a table that you can represent as an array.
Example:
id | word
1 | Sports
2 | Festivals
3 | Classes
4 | Other
You would simply select the data from the table with SQL, rather than have ...
Unique Constraint in Entity Framework Code First
... requirement yourself and leave the database out of it. This is a more portable solution and forces you to be clear about your business rules in your code, but leaves your database open to invalid data getting back-doored.
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Find the PID of a process that uses a port on Windows
...bject ProcessName, State, Protocol, AddressLocal, AddressForeign | Format-Table
Output:
ProcessName State Protocol AddressLocal AddressForeign
----------- ----- -------- ------------ --------------
System LISTENING TCP [::]:8080 [::]:0
System LISTENING TCP 0.0.0.0:...
How can I add a column that doesn't allow nulls in a Postgresql database?
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You have to set a default value.
ALTER TABLE mytable ADD COLUMN mycolumn character varying(50) NOT NULL DEFAULT 'foo';
... some work (set real values as you want)...
ALTER TABLE mytable ALTER COLUMN mycolumn DROP DEFAULT;
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