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MySQL - Make an existing Field Unique
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CREATE UNIQUE INDEX foo ON table_name (field_name)
You have to remove duplicate values on that column before executes that sql.
Any existing duplicate value on that column will lead you to mysql error 1062
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Php multiple delimiters in explode
...be escaped to work (such as /, ?). For example: preg_split("/(\/|\?|=)/", $foo);.
– kenorb
Apr 24 '15 at 19:11
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run main class of Maven project [duplicate]
...example.Main</mainClass>
<arguments>
<argument>foo</argument>
<argument>bar</argument>
</arguments>
</configuration>
</plugin>
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How to find the foreach index?
... be the accepted answer, since key can be a string too. say you do $myarr['foo'] = 'bar'; this method fails
– Toskan
Sep 26 '14 at 6:40
12
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How to print like printf in Python3?
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Simple Example:
print("foo %d, bar %d" % (1,2))
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TLSF源码及算法介绍 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...表现良好，可以将它看做是一个动态管理内存的内存池，提供分配及回收内存的方法，并能够进行内存碎片化整理。它的特点在于：
可以预期的分配执行时间，无论对于多达的内存分配请求，TLSF可以在限定的时间内完成分配...
Remove new lines from string and replace with one empty space
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You're right; /\s\s+/ would fail to match the linefeed in foo\nbar.
– Alan Moore
Sep 22 '10 at 23:18
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How to do a logical OR operation in shell scripting
...bin/sh
argc=$#
echo $argc
if [ $argc -eq 0 -o $argc -eq 1 ]; then
echo "foo"
else
echo "bar"
fi
I don't think sh supports "==". Use "=" to compare strings and -eq to compare ints.
man test
for more details.
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MySQL: selecting rows where a column is null
...ng, it's not not-equal to anything, either. In other words, select * from foo where bar <> "abc" will not return rows where bar is null. That threw me for a loop today. The docs call <> the "not equal to" operator, but really it's the "is equal to something other than" operator.
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Enum String Name from Value
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What is the behavior in case of enum Foo { A = 1, B= 1 }?
– dbkk
Jul 5 '11 at 6:26
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