大约有 43,000 项符合查询结果（耗时：0.0378秒） [XML]
Can you create nested WITH clauses for Common Table Expressions?
...NT(1) AS count FROM dual)
union all
select 100 AS CT from dual
)
select CT FROM A
share
|
improve this answer
|
foll...
How to draw a rounded Rectangle on HTML Canvas?
... "rgb(255, 0, 0)";
ctx.fillStyle = "rgba(255, 255, 0, .5)";
roundRect(ctx, 100, 5, 100, 100, 20, true);
// Manipulate it again
ctx.strokeStyle = "#0f0";
ctx.fillStyle = "#ddd";
// Different radii for each corner, others default to 0
roundRect(ctx, 300, 5, 200, 100, {
tl: 50,
br: 25
}, true);
/*...
MySQL Query GROUP BY day / month / year
..._date), MONTH(record_date), COUNT(*)
FROM stats
GROUP BY YEAR(record_date)*100 + MONTH(record_date)
I compared these versions on a big table with 1,357,918 rows (innodb),
and the 2nd version appears to have better results.
version1 (average of 10 executes): 1.404 seconds
version2 (average of 10...
How to pretty print XML from Java?
...
100
Now it's 2012 and Java can do more than it used to with XML, I'd like to add an alternative to...
Scatter plot and Color mapping in Python
...le
import numpy as np
import matplotlib.pyplot as plt
x = np.random.rand(100)
y = np.random.rand(100)
t = np.arange(100)
plt.scatter(x, y, c=t)
plt.show()
Here you are setting the color based on the index, t, which is just an array of [1, 2, ..., 100].
Perhaps an easier-to-understand example ...
ZMQ: 基本原理 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...可靠性保证。
ØMQ抽象了指定发送数据到特定网络位置这样需求。消息是被发送到拓扑的，而不是发送给特定的终端节点。重新调用哪个与特定商务逻辑紧密相连的拓扑意味着当你发送消息给拓扑的时候，你基本上已经请...
ZMQ: 基本原理 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...可靠性保证。
ØMQ抽象了指定发送数据到特定网络位置这样需求。消息是被发送到拓扑的，而不是发送给特定的终端节点。重新调用哪个与特定商务逻辑紧密相连的拓扑意味着当你发送消息给拓扑的时候，你基本上已经请...
Maximum number of records in a MySQL database table
...u don't have to make your primary key an integer, you could make it a CHAR(100). You could also declare the primary key over more than one column.
There are other constraints on table size besides number of rows. For instance you could use an operating system that has a file size limitation. Or y...
Why is GHC so large/big?
...ompressed Size: 3,736k
Uncompressed Size: 991k
But it is still more than 100 MB, not 26 MB as you write.
Heavyweight things in ghc6 and ghc6-prof are:
$ dpkg -L ghc6 | grep '\.a$' | xargs ls -1ks | sort -k 1 -n -r | head -3
57048 /usr/lib/ghc-6.12.1/ghc-6.12.1/libHSghc-6.12.1.a
22668 /usr/lib/gh...
Why is semicolon allowed in this python snippet?
...eful. Standard C code will often read something like this:
for(i=0; i<100; i++) {
do something here;
do another thing here;
}
continue doing things;
where you use the whitespace for a lot of clarity - and it is easy to see where the loop ends.
Python does let you terminate with an (...