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boost多索引容器multi_index_container实战 - C/C++ - 清泛网 - 专注C/C++及内核技术
...13-Jun-07 03:14:05.335577 INFO g:performance god/multi_index_container.cpp:123 main
RealTime: 0.251333s
Desc: Map删除
./godmulti_index_container.exe 5000000
container: 16 idPersons: 24 namePersons: 24
---------------插入5000000次-----------------
2013-Jun-07 03:41:53.712...
What are the use cases for selecting CHAR over VARCHAR in SQL?
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(CustomerFirstName,CustomerLastName, CustomerCityStateZip) ('Joe','Blow','123 Main St Washington, MD 12345', 123.45)
create view vwStagingTable AS
SELECT CustomerFirstName = CAST(CustomerFirstName as CHAR(30)),
CustomerLastName = CAST(CustomerLastName as CHAR(30)),
CustomerCityStateZip = CAST(Cust...
Changing column names of a data frame
...k it was asked for data.frame, not data.table
– Helix123
Apr 16 '15 at 19:15
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Android- create JSON Array and JSON Object
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Swapnil KotwalSwapnil Kotwal
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add a co...
MySQL Query to select data from last week?
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123
SELECT id FROM tbl
WHERE date >= curdate() - INTERVAL DAYOFWEEK(curdate())+6 DAY
AND date &...
Apk location in New Android Studio
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123
To help people who might search for answer to this same question, it is important to know what...
Simple regular expression for a decimal with a precision of 2
...e
deci_num_checker = re.compile(r"""^[0-9]+(\.[0-9]{1,2})?$""")
valid = ["123.12", "2", "56754", "92929292929292.12", "0.21", "3.1"]
invalid = ["12.1232", "2.23332", "e666.76"]
assert len([deci_num_checker.match(x) != None for x in valid]) == len(valid)
assert [deci_num_checker.match(x) == None fo...
Keyword not supported: “data source” initializing Entity Framework Context
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Craig StuntzCraig Stuntz
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.NET4.5新特性 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...希望这个字符串里只包含数字。
*如果我们要验证字符串123456X，会分别验证1、12、123、1234、12345、123456、123456X…
*但是如果我们多加一个数字进去，将会变成7条路径。换句话说，随着字符串长度的增长，正则表达式将会花掉更...