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Select first row in each GROUP BY group?
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17 Answers
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手机蓝牙控制台灯：HC-05 开关、无级调光、定时关灯（附 .aia 源码与单片机...
...机 → 台灯
L:60\n
亮度设为 60%（0 = 关灯，范围 0~100）
台灯 → 手机
OK:60\r\n
已执行，当前亮度 60%
开关灯不用单独指令：关灯发 L:0，开灯发上次的亮度。
硬件与单片机程序
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Dynamically creating keys in a JavaScript associative array
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144
Use the first example. If the key doesn't exist it will be added.
var a = new Array();
a['na...
Full examples of using pySerial package [closed]
...he device you are connecting to)
ser = serial.Serial(
port='/dev/ttyUSB1',
baudrate=9600,
parity=serial.PARITY_ODD,
stopbits=serial.STOPBITS_TWO,
bytesize=serial.SEVENBITS
)
ser.isOpen()
print 'Enter your commands below.\r\nInsert "exit" to leave the application.'
input=1
whil...
SQLite INSERT - ON DUPLICATE KEY UPDATE (UPSERT)
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31
Since 3.24.0 SQLite also supports upsert, so now you can simply write the following
INSERT INTO...
How to convert CharSequence to String?
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answered Oct 10 '11 at 0:38
Mike SamuelMike Samuel
106k2626 gold badges195195 silver badges228228 bronze badges
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Why do results vary based on curly brace placement?
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169
That's one of the pitfalls of JavaScript: automatic semicolon insertion. Lines that do not end...
Pointer arithmetic for void pointer in C
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+100
Final conclusion: arithmetic on a void* is illegal in both C and C++.
GCC allows it as an extension, see Arithmetic on void- and Fu...
How can I get the corresponding table header (th) from a table cell (td)?
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136
var $th = $td.closest('tbody').prev('thead').find('> tr > th:eq(' + $td.index() + ')');
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