Oracle 9i sql query??????????????

Question

hello grp,thanks for you help.................
i have again some doubts to solve can anyone plz solve these..........
1) Create a query that will display the total number of employees and, of that total, the number of employees hired in 1995, 1996, 1997 and 1998.Create appropriate column headings as "Total", "1995", "1996" etc...
2) Create a matrix query to display the job, the salary for that job based on department number, and the total salary for that job, for department 20, 50, 80 and 90, giving each column an appropriate heading.
till now i have learnt use of multiple row functions and not subqueries,n solutions to above queries r not given.so plz help me out guys
thanx again in advance............

Answer 1

Ok, as you're obviously still struggling, I'll give you a pointer for the first question without actually doing it with your data...
SQL> create table mydata (val number);
Table created.
SQL> insert into mydata values (1);
1 row created.
SQL> insert into mydata values (2);
1 row created.
SQL> insert into mydata values (3);
1 row created.
SQL> insert into mydata values (1);
1 row created.
SQL> insert into mydata values (2);
1 row created.
SQL> insert into mydata values (4);
1 row created.
SQL> ed
Wrote file afiedt.buf
  1  select cnt.total,
  2         sum(decode(mydata.val,1,1)) as val1,
  3         sum(decode(mydata.val,2,1)) as val2,
  4         sum(decode(mydata.val,3,1)) as val3,
  5         sum(decode(mydata.val,4,1)) as val4
  6  from mydata,
  7       (select count(*) as total from mydata) cnt
  8* group by cnt.total
SQL> /
     TOTAL       VAL1       VAL2       VAL3       VAL4
         6          2          2          1          1
SQL>Now see if you can adapt that for your own data and let us know how you get on.
Then have an attempt yourself at the second question and come back to us with whatever you have done and we can help to correct it for you.
You'll only learn if you understand what it's doing yourself.