大约有 36,010 项符合查询结果（耗时：0.0572秒） [XML]
What is the difference between UNION and UNION ALL?
...plicate records (where all columns in the results are the same), UNION ALL does not.
There is a performance hit when using UNION instead of UNION ALL, since the database server must do additional work to remove the duplicate rows, but usually you do not want the duplicates (especially when developi...
Launch an app on OS X with command line
...rom a script. I need pass it command line arguments. Unfortunately, open doesn't accept command line args.
12 Answers
...
Storing images in SQL Server?
...ge number of performance tests and analysis is this:
if your pictures or document are typically below 256KB in size, storing them in a database VARBINARY column is more efficient
if your pictures or document are typically over 1 MB in size, storing them in the filesystem is more efficient (and wit...
Apache Kafka vs Apache Storm
...ful. One question can we use Apache Kafka to aggregate Apache log files or do we still need Flume to do that?
– Ananth Duari
Feb 18 '14 at 1:42
...
C libcurl get output into a string
I want to store the result of this curl function in a variable, how can I do so?
4 Answers
...
Angular JS: What is the need of the directive’s link function when we already had directive’s contro
... to perform some operations on scope and the template. It seems that I can do that in either the link function or the controller function (since both have access to the scope).
...
Is there an R function for finding the index of an element in a vector?
...st index of an element in v that is equal to x . I know that one way to do this is: which(x == v)[[1]] , but that seems excessively inefficient. Is there a more direct way to do it?
...
How to get the data-id attribute?
...ed to get the data-id of the clicked item and pass it to a webservice.
How do I get the data-id attribute? I'm using the .on() method to re-bind the click event for sorted items.
...
“Cannot connect to iTunes Store” in-app purchases
...y error was simply not setting up a Sandbox User, I forgot that step. And don't log into it from the Settings >> iTunes section of the device b/c that will break it. Wait and do it during the actual testing.
– Nathan Prather
Jul 22 '16 at 3:12
...
How to write file if parent folder doesn't exist?
... noop. Otherwise it creates all missing directories for you.
This module does what you want: https://npmjs.org/package/writefile . Got it when googling for "writefile mkdirp". This module returns a promise instead of taking a callback, so be sure to read some introduction to promises first. It mig...