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Find rows that have the same value on a column in MySQL
...* FROM member WHERE email = (Select email From member Where login_id = john123@hotmail.com)
This will return all records that have john123@hotmail.com as a login_id value.
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How to make a Java Generic method static?
... you are calling the static method,
Greet.sayHello("Bob");
Greet.sayHello(123);
JVM interprets it as the following.
Greet.<String>sayHello("Bob");
Greet.<Integer>sayHello(123);
Both giving the same outputs.
Hello Bob
Hello 123
...
网站伪静态Rewrite重写中文路径时乱码 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...请求。
这时的编码方法由网页的编码决定，也就是由HTML源码中字符集的设定决定。
<meta http-equiv=”Content-Type” content=”text/html;charset=xxxx”>
如果上面这一行最后的charset是UTF-8，则URL就以UTF-8编码；如果是GB2312，URL就以GB2312编...
What's the difference between a single precision and double precision floating point operation?
...ch precision they can store the numbers.
For example: I have to store 123.456789 One may be able to store only 123.4567 while other may be able to store the exact 123.456789.
So, basically we want to know how much accurately can the number be stored and is what we call precision.
Quoting @A...
Why is a div with “display: table-cell;” not affected by margin?
...ss="table">
<div class="row">
<div class="cell">123</div>
<div class="cell">456</div>
<div class="cell">879</div>
</div>
</div>
CSS
.table {display:table;border-collapse:separate;border-spacing:5px;}
.row {di...
Summarizing multiple columns with dplyr? [duplicate]
...brary(dplyr)
library(purrrlyr)
library(data.table)
library(bench)
set.seed(123)
n <- 10000
df <- data.frame(
a = sample(1:5, n, replace = TRUE),
b = sample(1:5, n, replace = TRUE),
c = sample(1:5, n, replace = TRUE),
d = sample(1:5, n, replace = TRUE),
grp = sample(1:3, n, replac...
Python how to write to a binary file?
...FileBytes)
bytearray(b'{\x03\xff\x00d')
>>> bytes(newFileBytes)
'[123, 3, 255, 0, 100]'
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Does Python have “private” variables in classes?
...names the variable.
class A:
def __init__(self):
self.__var = 123
def printVar(self):
print self.__var
Now, if you try to access __var outside the class definition, it will fail:
>>>x = A()
>>>x.__var # this will return error: "A has no attribute __var...
Retrieving parameters from a URL
...
import urlparse
url = 'http://example.com/?q=abc&p=123'
par = urlparse.parse_qs(urlparse.urlparse(url).query)
print par['q'][0], par['p'][0]
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...
Disabled href tag
...
You can use:
<a href="/" onclick="return false;">123n</a>
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