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Troubleshooting “The use statement with non-compound name … has no effect”
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PHP's use isn't the same as C++'s using namespace; it allows you to define an alias, not to "imp...
What is the difference between square brackets and parentheses in a regex?
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edited Aug 30 '17 at 16:21
B--rian
4,11777 gold badges2525 silver badges5252 bronze badges
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SQL update trigger only when column is modified
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answered Aug 27 '12 at 12:10
mehdi lotfimehdi lotfi
9,6011414 gold badges7373 silver badges121121 bronze badges
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Why does 2 == [2] in JavaScript?
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edited Nov 12 '09 at 19:11
answered Nov 12 '09 at 19:00
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When to use pip requirements file versus install_requires in setup.py?
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answered Aug 16 '11 at 21:04
Ian BickingIan Bicking
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SQL UPDATE all values in a field with appended string CONCAT not working
... linda |
| 3 | sam |
| 4 | henry |
+------+-------+
4 rows in set (0.02 sec)
mysql> update t set data=concat(data, 'a');
Query OK, 4 rows affected (0.01 sec)
Rows matched: 4 Changed: 4 Warnings: 0
mysql> select * from t;
+------+--------+
| id | data |
+------+--------+
| 1 ...
log4j logging hierarchy order
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306
This table might be helpful for you:
Going down the first column, you will see how the log w...
Is There a Better Way of Checking Nil or Length == 0 of a String in Ruby?
...y than the following to check to see if a string is nil OR has a length of 0 in Ruby?
16 Answers
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Need to understand the usage of SemaphoreSlim
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i guess that if i run 50 thread at a time then code like SemaphoreSlim ss = new SemaphoreSlim(10); will force to run 10 active thread at time
That is correct; the use of the semaphore ensures that there won't be more than 10 workers doing this wo...
How to debug a Flask app
...r PowerShell, use $env:
$env:FLASK_ENV = "development"
Prior to Flask 1.0, this was controlled by the FLASK_DEBUG=1 environment variable instead.
If you're using the app.run() method instead of the flask run command, pass debug=True to enable debug mode.
Tracebacks are also printed to the termi...