我刚刚开始学习SQL。当我写这段代码的时候
create database tutorial_1;
use tutorial_1;
create table tutorial
(
id int primary key,
name varchar(40),
duration decimal(4,2),
date date
);
insert into tutorial(id, name, duration, date)
values(1, 'c', 23.12, '2014-02-10');
insert into tutorial
values(2, '
大家好,我正在尝试将python3.6与opencv一起使用,并在最后一步中使用cmake命令链接了它们。我遇到了此错误消息,我的操作系统是MAC OS Sierra
[85%] Built target example_tutorial_pnp_detection
[85%] Built target example_tutorial_pnp_registration
/Users/mertalptasdelen/opencv/modules/python/src2/cv2.cpp:7:10: fatal error: 'Python.h' file not found
#i
我正在尝试使用slug访问一个页面,但是我一直得到这个错误The QuerySet value for an exact lookup must be limited to one result using slicing.,我认为这是一个filter或get错误,但我不知道错误是从哪里来的。
view.py
def tutorial_topic_category(request, slug):
tutorial_category = TutorialCategory.objects.get(slug=slug)
tutorial_topic_category = Tutori
按照这里的说明创建一个OOT模块-
https://wiki.gnuradio.org/index.php/Guided_Tutorial_GNU_Radio_in_Python
The cmake etc all works fine -
`cmake ../
make
sudo make install
sudo ldconfig`
但是当我加载GNURadio时,这些模块并没有出现。这是make install命令的输出-
`gnuradio@cjswin ~/gr-tutorial/build >> sudo make install
[ 66%] Built targe
我有两张桌子,tutorial:id,title和tutorial_tags:id,tutorial_id,title
tutorial模型中的关系定义如下:
function TutorialTag(){
return $this->hasMany('App\TutorialTag');
}
我想把tutorials和tutorial_tags连接起来,就像这样(请忽略语法错误):
select tutorials.* , tutorial_tags.* from `tutorials` left Join
`tuotrial_tags` ON