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Which is the preferred way to concatenate a string in Python?
Since Python's string can't be changed, I was wondering how to concatenate a string more efficiently?
12 Answers
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UPDATE multiple tables in MySQL using LEFT JOIN
I have two tables, and want to update fields in T1 for all rows in a LEFT JOIN.
5 Answers
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Is there a ceiling equivalent of // operator in Python?
I found out about the // operator in Python which in Python 3 does division with floor.
7 Answers
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How to use sidebar with the keyboard in Sublime Text 2 and 3?
When using Sublime Text 2 we tend to open the side bar to navigate thru files/folders in our projects. For that we can use the hotkey ctrl+k ctrl+b (in windows).
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Checkout subdirectories in Git?
Is it possible to check out subdirectories of a repository in Git?
9 Answers
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What is the difference between . (dot) and $ (dollar sign)?
What is the difference between the dot (.) and the dollar sign ($) ?
13 Answers
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How do I remove duplicates from a C# array?
I have been working with a string[] array in C# that gets returned from a function call. I could possibly cast to a Generic collection, but I was wondering if there was a better way to do it, possibly by using a temp array.
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Pairwise crossproduct in Python [duplicate]
How can I get the list of cross product pairs from a list of arbitrarily long lists in Python?
3 Answers
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Conditionally Remove Dataframe Rows with R [duplicate]
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Logic index:
d<-d[!(d$A=="B" & d$E==0),]
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SQL中使用update inner join和delete inner join；Oracle delete join替代...
...来做更新和删除操作非常有用.
例子：
Sql代码
update tb_User
set pass='' --此处pass前不要加 tb_User 别名usr
from tb_User usr
inner join tb_Address addr on usr.nAddressFK = addr.nAddressID
where usr.id=123
update的格式是
update t1 set t1.name=’Liu&r...