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delete_all vs destroy_all?
...any tables. I want to delete this user and every record that has his ID in all tables.
4 Answers
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Import package.* vs import package.SpecificType [duplicate]
...ld it suppose any difference regarding overhead to write an import loading all the types within one package ( import java.* ); than just a specific type (i.e. import java.lang.ClassLoader )? Would the second one be a more advisable way to use than the other one?
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创业测试：50个迹象表明你真该创业了 - 资讯 - 清泛网 - 专注C/C++及内核技术
...方式来帮这些人走出没有工作的困境。
25.你有强烈的去开发一种全新产品或是服务的渴望。你是一个问题解决者。你经历过“啊哈”时刻，知道某种具体产品或服务的实现并是不发生在上市时刻。你可以用获得认可的时刻来鼓...
remove None value from a list without removing the 0 value
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Iteration vs Space, usage could be an issue. In different situations profiling may show either to be "faster" and/or "less memory" intensive.
# first
>>> L = [0, 23, 234, 89, None, 0, 35, 9, ...]
>>> [x for x in L if ...
Converting from IEnumerable to List [duplicate]
...d this very example, and there is no ToList() method in IEnumerable. Using VS 2015 and .NET 4.6.1 .
– James
Dec 22 '16 at 20:20
3
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Could not load file or assembly 'Newtonsoft.Json' or one of its dependencies. Manifest definition do
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To solve this, I ensured all my projects used the same version by running the following command and checking the results:
update-package Newtonsoft.Json -reinstall
And, lastly I removed the following from my web.config:
<dependentAssembly>...
The Following Module was built either with optimizations enabled or without debug information
...ode on the non-web project in question and it's in Active(Debug). Deleted all items in my .NET 2.0 temp folder in Windows. Not sure what else to do here.
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Count(*) vs Count(1) - SQL Server
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There is no difference.
Reason:
Books on-line says "COUNT ( { [ [ ALL | DISTINCT ] expression ] | * } )"
"1" is a non-null expression: so it's the same as COUNT(*).
The optimizer recognizes it for what it is: trivial.
The same as EXISTS (SELECT * ... or EXISTS (SELECT 1 ...
Example:
SE...
When to use CouchDB over MongoDB and vice versa
...ta changes too much, filling up disks.
CouchDB : For accumulating, occasionally changing data, on which pre-defined queries are to be run. Places where versioning is important.
A recent (Feb 2012) and more comprehensive comparison by Riyad Kalla,
MongoDB : Master-Slave Replication ONLY
CouchDB ...
SQL keys, MUL vs PRI vs UNI
... non-unique index, then why does MUL show against only that column and not all other columns as well.?
– Vikas Goel
Jun 15 '19 at 23:23
2
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