大约有 6,000 项符合查询结果（耗时：0.0187秒） [XML]
Join vs. sub-query
...y comes down to performance. Some optimisers suck lemons when given a join vs a sub-query, and some suck lemons the other way, and this is optimiser-specific, DBMS-version-specific and query-specific.
Historically, explicit joins usually win, hence the established wisdom that joins are better, but ...
Repository Pattern vs DAL
Are they the same thing? Just finished to watch Rob Connery's Storefront tutorial and they seem to be similar techinques. I mean, when I implement a DAL object I have the GetStuff, Add/Delete etc methods and I always write the interface first so that I can switch db later.
...
`from … import` vs `import .` [duplicate]
...
Many people have already explained about import vs from, so I want to try to explain a bit more under the hood, where the actual difference lies.
First of all, let me explain exactly what the basic import statements do.
import X
Imports the module X, and creates a referen...
Equals(=) vs. LIKE
...
This is a copy/paste of another answer of mine for question SQL 'like' vs '=' performance:
A personal example using mysql 5.5: I had an inner join between 2 tables, one of 3 million rows and one of 10 thousand rows.
When using a like on an index as below(no wildcards), it took about 30 seconds...
Using try vs if in python
Is there a rationale to decide which one of try or if constructs to use, when testing variable to have a value?
9 Ans...
ASP.Net: Literal vs Label
..., 'https%3a%2f%2fstackoverflow.com%2fquestions%2f3309398%2fasp-net-literal-vs-label%23new-answer', 'question_page');
}
);
Post as a guest
Name
...
How to create an installer for a .net Windows Service using Visual Studio
...p project in your Solution Explorer.
Select View > Custom Actions. (In VS2008 it might be View > Editor > Custom Actions)
Right-click on the Install action in the Custom Actions tree and select 'Add Custom Action...'
In the "Select Item in Project" dialog, select Application Folder and cli...
Asynchronous vs synchronous execution, what does it really mean? [closed]
...
IMHO, these pictures do not all describe the synchronous vs asycnhronous execution of tasks For example, the second picture implies that asynchronous tasks require several threads. Actually, it does not. And that tasks have to run in parallel, which is not a requirement as well. ...
MySQL: Transactions vs Locking Tables
I'm a bit confused with transactions vs locking tables to ensure database integrity and make sure a SELECT and UPDATE remain in sync and no other connection interferes with it. I need to:
...
When to use @QueryParam vs @PathParam
I am not asking the question that is already asked here:
What is the difference between @PathParam and @QueryParam
14 Answ...