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Unique constraint that allows empty values in MySQL
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Yes, you can do this. See the MySQL reference (version 5.5).
A UNIQUE index creates a constraint such that all values in the index must be distinct. An error occurs if you try to add a new row with a key value that matches an existing row. For all engines, a UNIQUE index allows multiple NULL v...
Work on a remote project with Eclipse via SSH
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C/C++ indexing is not working properly with RSE. Indexer complains about missing symbols. It works well when the project and source files are stored locally but with RSE it does'nt. any ideas?
– Black_Zero
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Undo a git stash
... preserve the state of files (staged vs. working), use
git stash apply --index
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Apache: “AuthType not set!” 500 Error
...firing up a local server for a project and when I try to request localhost/index.html, I get a 500 error and I see this in the error log:
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How can I open the interactive matplotlib window in IPython notebook?
...pyplot as plt
import seaborn as sns
ts = pd.Series(np.random.randn(1000), index=pd.date_range('1/1/2000', periods=1000))
ts = ts.cumsum()
df = pd.DataFrame(np.random.randn(1000, 4), index=ts.index,
columns=['A', 'B', 'C', 'D'])
df = df.cumsum()
df.plot(); plt.legend(loc='best') ...
Eclipse: Set maximum line length for auto formatting?
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Note: Eclipse (Kepler, at least) very obnoxiously allows you to edit the built-in profile to your heart's content, only to stop you from saving it with an unobtrusive notification that you CAN'T edit built-in profiles, and must create a copy and edit that instead.
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Git 工具 - 子模块(submodule)：一个仓库包含另一个仓库 - 开源 & Github -...
...DbConnector
diff --git a/DbConnector b/DbConnector
new file mode 160000
index 0000000..c3f01dc
--- /dev/null
+++ b/DbConnector
@@ -0,0 +1 @@
+Subproject commit c3f01dc8862123d317dd46284b05b6892c7b29bc
虽然 DbConnector 是工作目录中的一个子目录，但 Git 还是会将它视...
Analyze audio using Fast Fourier Transform
...Nsamples;
float band_power = 0.0;
float harmonic_amplitude=0.0;
int i, out_index;
out_index=0;
for (i = 0; i < Nsamples / 2 + 1; i++)
{
if (i == 1 || i == 2 || i == 4 || i == 8 || i == 17 || i == 33 || i == 66 || i == 132 || i == 264 || i == 511)
{
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What do the result codes in SVN mean?
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SVN status columns
$ svn status
L index.html
The output of the command is split into six columns, but that is not obvious because sometimes the columns are empty. Perhaps it would have made more sense to indicate the empty columns with dashes, the way ls -l...
Get HTML Source of WebElement in Selenium WebDriver using Python
... Though innerHTML is not a DOM attribute, it is well supported by all major browsers (quirksmode.org/dom/w3c_html.html). It works also well for me.
– CuongHuyTo
Jul 23 '12 at 10:57
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