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SQL UPDATE all values in a field with appended string CONCAT not working
... 2 | 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 |
+------+--------+
| ...
SQlite Getting nearest locations (with latitude and longitude)
... - This is just a cut down version of pythagoras famous theorem. Given two sets of coordinates, the difference between the two X values represents one side of a right angled triangle and the difference between the Y values is the other. To get the hypotenuse (and therefore the distance between the p...
What's a standard way to do a no-op in python?
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What is the difference between “AS” and “IS” in an Oracle stored procedure?
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How can I output the value of an enum class in C++11
How can I output the value of an enum class in C++11? In C++03 it's like this:
7 Answers
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How to use PyCharm to debug Scrapy projects
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If I'm doing that, my settings module is not found. ImportError: No module named settings I have checked that the working directory is the project directory. It's used within a Django project. Anyone else stumbled upon this problem?
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What is the easiest way to push an element to the beginning of the array?
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How do I restart a WPF application? [duplicate]
...een release in a timely fashion. As a result I put a value into Properties.Settings that indicates that the application is restarting. Before calling Application.Restart() the Properties.Settings value is set to true. In Program.Main() I also added a check for that specific property.settings value s...
记一次MongoDB性能问题 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...nning on a NUMA machine. We suggest launching mongod like this to avoid performance problems: numactl –interleave=all mongod [other options]
当时我并不太清楚NUMA是什么东西，所以没有处理，只是把问题反馈给了运维人员，后来知道运维人员也没有理会这...
Memcached下一站：HandlerSocket！ - 更多技术 - 清泛网 - 专注C/C++及内核技术
Memcached下一站：HandlerSocket！目前使用MySQL的网站，多半同时使用Memcached作为键值缓存。虽然这样的架构极其流行，有众多的案例，但过于依赖Memcached，无形中让Memcach...目前使用MySQL的网站，多半同时使用Memcached作为键值缓存。虽...