mysql基础
MySQL基础
企业面试题1 代码 select m.id,m.num
from
(
select t.id as id,count(1) num
from
(
select ra.requester_id as id
from RequestAccepted raunion all
select ra.accepter_id as id
from RequestAccepted ra
) t
group by t.id
) m
group by id
ord…
Python_GUI框架 Pyside6的信号与槽应用
在Pyside6框架中,信号与槽(Signals and Slots)机制是连接用户界面元素与响应功能的核心机制。我们可以把信号想象成一根电线,而槽就是电线的另一端连接的灯泡。当电线(信号&…