大约有 47,000 项符合查询结果（耗时：0.0627秒） [XML]
Error Code: 1005. Can't create table '…' (errno: 150)
...ey name to test for this.
One or both of your tables is a MyISAM table. In order to use foreign keys, the tables must both be InnoDB. (Actually, if both tables are MyISAM then you won’t get an error message - it just won’t create the key.) In Query Browser, you can specify the table type.
You ha...
What are the differences between Perl, Python, AWK and sed? [closed]
...
In order of appearance, the languages are sed, awk, perl, python.
The sed program is a stream editor and is designed to apply the actions from a script to each line (or, more generally, to specified ranges of lines) of the inpu...
What are the best practices for using a GUID as a primary key, specifically regarding performance?
... separate key - the primary (logical) key on the GUID, and the clustering (ordering) key on a separate INT IDENTITY(1,1) column.
As Kimberly Tripp - the Queen of Indexing - and others have stated a great many times - a GUID as the clustering key isn't optimal, since due to its randomness, it will ...
uwsgi invalid request block size
... In Nginx configuration file we may want to use this: include /etc/nginx/uwsgi_params; uwsgi_pass django_upstream;
– mennanov
Feb 3 '15 at 18:04
4
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Group vs role (Any real difference?)
...in beta (like a role) or the users in beta are in alpha (like a group). In order to make terminology like "includes" and visual elements like tree views unambiguous, most rbac systems require you to specify whether the collection at issue is a "group" or a "role" at least for the sake of discussion....
How to create a custom attribute in C#
...just data. However, using reflection, one can leverage those attributes in order to create functionality.
So, for instance, let's look at the Validation Application Block, from Microsoft's Enterprise Library. If you look at a code example, you'll see:
/// <summary>
/// blah blah code...
What are the differences between django-tastypie and djangorestframework? [closed]
... to Django idioms throughout - built on top of Django's class based views, etc... (Whereas TastyPie came along before Django's CBVs existed, so uses it's own class-based views implementation)
I'd like to think that the underlying architecture is pretty nicely built, decoupled etc...
In any case, ...
How does the Windows Command Interpreter (CMD.EXE) parse scripts?
...e special characters & | < or >, split the line at this point in order to handle pipes, command concatenation, and redirection.
In the case of a pipe (|), each side is a separate command (or command block) that gets special handling in phase 5.3
In the case of &, &&, or || co...
Grouping functions (tapply, by, aggregate) and the *apply family
...a function to the 1st elements
of each, and then the 2nd elements of each, etc., coercing the result
to a vector/array as in sapply.
This is multivariate in the sense that your function must accept
multiple arguments.
#Sums the 1st elements, the 2nd elements, etc.
mapply(sum, 1:5, 1:5, 1:5)
[1] ...
Show all Elasticsearch aggregation results/buckets and not just 10
...s 10 documents by default. We don't need them.
By default, the buckets are ordered by the doc_count in decreasing order.
Why do I get Fielddata is disabled on text fields by default error?
Because fielddata is disabled on text fields by default. If you have not wxplicitly chosen a field typ...