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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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Window Features - 更多技术 - 清泛网 - 专注C/C++及内核技术
...ng style bit is cleared and set again.
Hit testing of a layered window is based on the shape and transparency of the window. This means that the areas of the window that are color-keyed or whose alpha value is zero will let the mouse messages through. However, if the layered window has the WS_EX_TR...
Entity Framework DateTime and UTC
... Approach with CTP5 currently) store all DateTime values as UTC in the database?
13 Answers
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When is it appropriate to use UDP instead of TCP? [closed]
... The UDP to TCP code ratio is probably about 80/20. The product is a database server, so reliability is critical. We have to handle all of the issues imposed by UDP (packet loss, packet doubling, packet order, etc.) already mentioned in other answers. There are rarely any problems, but they do s...
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...
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 != ...
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...