大约有 40,000 项符合查询结果（耗时：0.0510秒） [XML]
CASCADE DELETE just once
...ger primary key);
NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index "a_pkey" for table "a"
CREATE TABLE
testing=# create table b (id integer references a);
CREATE TABLE
-- put some data in the table
testing=# insert into a values(1);
INSERT 0 1
testing=# insert into a values(2);
INSERT...
Join vs. sub-query
...y when it thinks one is faster than the other. It all depends on the data, indexes, correlation, amount of data, query, etc.
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How can I display an RTSP video stream in a web page?
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All you need to do is to upgrade your camera to Standard/Professional package and you will be able to embed your camera into your web page.
– Adorjan Princz
Apr 23 '17 at 20:10
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Running a cron job at 2:30 AM everyday
...mmand
Crontab Format:
MIN HOUR DOM MON DOW CMD
Format Meanings and Allowed Value:
MIN Minute field 0 to 59
HOUR Hour field 0 to 23
DOM Day of Month 1-31
MON Month field 1-12
DOW Day Of Week 0-6
CMD Command Any command to be executed.
Restart cro...
Solutions for distributing HTML5 applications as desktop applications? [closed]
...ite native apps in HTML and JavaScript with node-webkit. It also lets you call Node.js modules directly from the DOM and enables a new way of writing native applications with all Web technologies.
Intel is behind this (?). I've been told it's very rough around the edges.
Brackets Shell, the sandbo...
“Thinking in AngularJS” if I have a jQuery background? [closed]
...re. Most screen readers will now parse JavaScript. Search engines can also index AJAXed content. Nevertheless, you will want to make sure you are using pushstate URLs and you have a decent sitemap. See here for a discussion of the issue: https://stackoverflow.com/a/23245379/687677
Separation of con...
HTML img scaling
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Only set the width or height, and it will scale the other automatically. And yes you can use a percentage.
The first part can be done, but requires JavaScript, so might not work for all users.
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WhatsApp API (java/python) [closed]
... on the GitHub. This however according to my knowledge is made possible in PHP. You can check the link here: https://github.com/venomous0x/WhatsAPI
Hope this helps
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In Vim, how do I apply a macro to a set of lines?
...at performs an operation on a single line. I want to repeat that macro on all of the remaining lines in the file. Is there a quick way to do this?
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Is memcached a dinosaur in comparison to Redis? [closed]
...ould not care too much about performances. Redis is faster per core with small values, but memcached is able to use multiple cores with a single executable and TCP port without help from the client. Also memcached is faster with big values in the order of 100k. Redis recently improved a lot about bi...