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When should I use cross apply over inner join?
...where we need to replace INNER JOIN with CROSS APPLY.
1. Join two tables based on TOP n results
Consider if we need to select Id and Name from Master and last two dates for each Id from Details table.
SELECT M.ID,M.NAME,D.PERIOD,D.QTY
FROM MASTER M
INNER JOIN
(
SELECT TOP 2 ID, PERIOD,QTY
...
Using do block vs braces {}
...
The first and very common style was popularized by Ruby on Rails, and is based on a simple rule of single vs. multi-line:
Use braces { } for single-line blocks
Use do end for multi-line blocks
This makes sense because do/end reads badly in a one-liner, but for multi-line blocks, leaving a clos...
What's the difference between Sender, From and Return-Path?
...anks for giving the official RFC link. It's really useful if someone ask, "Based on what?"
– bayuah
Nov 22 '15 at 23:29
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Move assignment operator and `if (this != &rhs)`
...iting a high level class that doesn't directly manage memory (but may have bases or members that do), then the best implementation of move assignment is often:
Class& operator=(Class&&) = default;
This will move assign each base and each member in turn, and will not include a this != ...
Should composer.lock be committed to version control?
...ey-pressers "generated material"? I'm not sure that is a solid criteria to base a policy on. =)
– Quinn Comendant
Mar 21 '14 at 21:25
5
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Python circular importing?
...ght, any circular dependencies in the modules' top level code (such as the base classes of class declarations in your example) will be a problem. That is the sort of situation where jpmc's answer that you should refactor the module organization is probably 100% correct. Either move class B into modu...
Difference between DTO, VO, POJO, JavaBeans?
...ics.
You can usually tell them because their notion of equality isn't based on identity, instead two value objects are equal if all their fields are equal. Although all fields are equal, you don't need to compare all fields if a subset is unique - for example currency codes for currency objects...
Difference between CC, gcc and g++?
...ink to gcc.
However, even on Solaris, it could be that cc is the old BSD-based C compiler from /usr/ucb. In practice, that usually isn't installed and there's just a stub that fails, wreaking havoc on those who try to compile and install self-configuring software.
On HP-UX, the default 'cc' is s...
Database development mistakes made by application developers [closed]
What are common database development mistakes made by application developers?
40 Answers
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Can “using” with more than one resource cause a resource leak?
...he same, lose attention and otherwise be at a greater loss. Just an advice based on personal experience.
– user1306322
Jan 15 '14 at 3:55
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