大约有 30,000 项符合查询结果（耗时：0.0565秒） [XML]
Font scaling based on width of container
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This is where the so-called element queries come in. Unlike media-queries, element queries would size things based on its containing block, not the viewport, which would be amazing! But unfortunately it doesn't exist yet. However, some polyfills ...
MySQL select one column DISTINCT, with corresponding other columns
...STINCT results from the FirstName column, but I need the corresponding ID and LastName .
12 Answers
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Linq: What is the difference between Select and Where
...tely different operators acting on IEnumerables.
The first one is what we call a Projection Operator, while the last one is a Restriction Operator.
One interesting way to have insight on the behavior of such operators is to take a look at their "functional type".
Select : (IEnumerable<T1>...
How to diff one file to an arbitrary version in Git?
... With windows files I've found it easier to change directory and then call git diff master~20:./pom.xml ./pom.xml
– lloyd
Aug 24 '18 at 6:16
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MYSQL OR vs IN performance
...elieve people who give their "opinion", science is all about testing and evidence.
I ran a loop of 1000x the equivalent queries (for consistency, I used sql_no_cache):
IN: 2.34969592094s
OR: 5.83781504631s
Update:
(I don't have the source code for the original test, as it was 6 years ago, though...
How do you copy a record in a SQL table but swap out the unique id of the new row?
...ce table and destination table are the same and the primary key is a uniqueidentifier (guid). When I try this:
11 Answers
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How to print a query string with parameter values when using Hibernate
... I am using grails 2.4.4 and hibernate 4. Changing log4j configuration did not work for me but p6spy worked!
– Champ
Jan 13 '15 at 7:03
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Memcached vs. Redis? [closed]
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Persistence
By default redis persists your data to disk using a mechanism called snapshotting. If you have enough RAM available it's able to write all of your data to disk with almost no performance degradation. It's almost free!
In snapshot mode there is a chance that a sudden crash could result i...
How do I look inside a Python object?
...t-in functions:
type()
dir()
id()
getattr()
hasattr()
globals()
locals()
callable()
type() and dir() are particularly useful for inspecting the type of an object and its set of attributes, respectively.
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When to add what indexes in a table in Rails
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Should I add "index" to all the foreign keys like "xxx_id"?
It would be better, because it accelerates the search in sorting in this column. And Foreign keys are something searched for a lot.
Since Version 5 of rails the index will be created automatically, for more informatio...