select concat( trunc( random() * 254 ), '.' ,trunc( random() * 25...
input <- sample(c(25:75)) input isGood <- function(x) { if (x>50)...
list1 = [0.108, 0.108, 0.111, 0.11, 0.108, 0.109, 0.109, 0.115, 0.113, 0.109, 0...
collected_list = [ [('0.017', '0.107'), ('0.018', '0.115'), ('0.019', '0.113'),...
create table ithelp180727_emp ( id serial primary key , ename text not nul...
create table ithelp180723_emp ( id serial primary key , ename text not null...
使用Postgresql 輕鬆愉快 create table ithelp180617a ( id serial primary key , val te...
用PostgreSQL輕鬆愉快多了. create table ithelp180531 ( val text not null ); insert in...