如何在PostgreSQL中查看txt/doc/pdf/html文件

Question

我有表格和數據。

我要的是，通過有names ..

--student table 

create table student(
sid int, 
sname text 
); 


--student details 

insert into student(sid,sname) 
values(101,'John'), 
(102,'barbie'), 
(103,'britney'), 
(104,'jackson'), 
(105,'abraham') 
; 

--questions table all the questions for the test 

create table questions(
questionid serial, 
question text 
); 

--i have the questions in my table 

insert into questions(question) 
values('How much is 1+1'),('What is the value of PI'),('Whose dimensions are all equal'); 

--the test table it contains the details of the test attebdee by every student.. 

create table test(
sno serial, 
sid int, 
questionid int, 
answer text, 
marks int 
); 

--insert into test table the answers and the marks ..should be updated here.. 

insert into test(sid,questionid,answer,marks) 
values(101,1,'2',10), 
(102,2,' 3 ',0), 
(103,3,' ring ',0), 
(104,1,' 1 ',0), 
(105,1,' 1 ',0), 
(101,2,'3.7',0), 
(101,3,' square',10); 

我的要求sorted生成所有學生的報告：

我TXT/DOC/PDF/HTML文件，該文件是生成應該在一個視圖如下

live sql fiddle demo i tried

Answer 1

可能是這樣的：

copy(
    with cte as (
     select 
      s.sid, s.sname, 
      q.question, t.answer, t.marks, 
      row_number() over(partition by s.sid order by t.sno) as row_num 
     from student as s 
      left outer join test as t on t.sid = s.sid 
      left outer join questions as q on q.questionid = t.questionid 
    ) 
    select 
     case when c.row_num = 1 then c.sid else null end as sid, 
     case when c.row_num = 1 then c.sname else null end as sname, 
     c.question, c.answer, c.marks 
     from cte as c 
     order by c.sname asc, c.row_num asc 
) to 'e:\sample.csv' delimiter ',' csv header; 

sql fiddle demo