I need sql query

Question

1. Find employees' data, hired on MANAGER position in NEW YORK or CHICAGO. Sort them by descending salaries

3. Create all pairs of employees' names who work in the same department. The names in these pairs should be different and the pairs should not repeat.

4. For every department show employee's name which is first in alphabetical order

5. Choose managers (employees working on position MANAGER) who have exactly two subordinates. List their work places and their salary grades to which their salaries belong.

6. Show department's name whose employees earn most (on aggregate) and the name of the department where employees earn least (on aggregate). Write the result in the form of one sentence:

SET TERMOUT ON PROMPT Building demonstration tables. Please wait. SET TERMOUT OFF

DROP TABLE EMP; DROP TABLE DEPT; DROP TABLE BONUS; DROP TABLE SALGRADE; DROP TABLE DUMMY;

CREATE TABLE EMP (EMPNO NUMBER(4) NOT NULL, ENAME VARCHAR2(10), JOB VARCHAR2(9), MGR NUMBER(4), HIREDATE DATE, SAL NUMBER(7, 2), COMM NUMBER(7, 2), DEPTNO NUMBER(2));

INSERT INTO EMP VALUES (7369, 'SMITH', 'CLERK', 7902, TO_DATE('17-MAR-1980', 'DD-MON-YYYY'), 800, NULL, 20); INSERT INTO EMP VALUES (7499, 'ALLEN', 'SALESMAN', 7698, TO_DATE('20-MAR-1981', 'DD-MON-YYYY'), 1600, 300, 30); INSERT INTO EMP VALUES (7521, 'WARD', 'SALESMAN', 7698, TO_DATE('22-MAR-1981', 'DD-MON-YYYY'), 1250, 500, 30); INSERT INTO EMP VALUES (7566, 'JONES', 'MANAGER', 7839, TO_DATE('2-MAR-1981', 'DD-MON-YYYY'), 2975, NULL, 20); INSERT INTO EMP VALUES (7654, 'MARTIN', 'SALESMAN', 7698, TO_DATE('28-MAR-1981', 'DD-MON-YYYY'), 1250, 1400, 30); INSERT INTO EMP VALUES (7698, 'BLAKE', 'MANAGER', 7839, TO_DATE('1-MAR-1981', 'DD-MON-YYYY'), 2850, NULL, 30); INSERT INTO EMP VALUES (7782, 'CLARK', 'MANAGER', 7839, TO_DATE('9-MAR-1981', 'DD-MON-YYYY'), 2450, NULL, 10); INSERT INTO EMP VALUES (7788, 'SCOTT', 'ANALYST', 7566, TO_DATE('09-MAR-1982', 'DD-MON-YYYY'), 3000, NULL, 20); INSERT INTO EMP VALUES (7839, 'KING', 'PRESIDENT', NULL, TO_DATE('17-MAR-1981', 'DD-MON-YYYY'), 5000, NULL, 10); INSERT INTO EMP VALUES (7844, 'TURNER', 'SALESMAN', 7698, TO_DATE('8-MAR-1981', 'DD-MON-YYYY'), 1500, 0, 30); INSERT INTO EMP VALUES (7876, 'ADAMS', 'CLERK', 7788, TO_DATE('12-MAR-1983', 'DD-MON-YYYY'), 1100, NULL, 20); INSERT INTO EMP VALUES (7900, 'JAMES', 'CLERK', 7698, TO_DATE('3-MAR-1981', 'DD-MON-YYYY'), 950, NULL, 30); INSERT INTO EMP VALUES (7902, 'FORD', 'ANALYST', 7566, TO_DATE('3-MAR-1981', 'DD-MON-YYYY'), 3000, NULL, 20); INSERT INTO EMP VALUES (7934, 'MILLER', 'CLERK', 7782, TO_DATE('23-MAR-1982', 'DD-MON-YYYY'), 1300, NULL, 10);

CREATE TABLE DEPT (DEPTNO NUMBER(2), DNAME VARCHAR2(14), LOC VARCHAR2(13) );

INSERT INTO DEPT VALUES (10, 'ACCOUNTING', 'NEW YORK'); INSERT INTO DEPT VALUES (20, 'RESEARCH', 'DALLAS'); INSERT INTO DEPT VALUES (30, 'SALES', 'CHICAGO'); INSERT INTO DEPT VALUES (40, 'OPERATIONS', 'BOSTON');

CREATE TABLE BONUS (ENAME VARCHAR2(10), JOB VARCHAR2(9), SAL NUMBER, COMM NUMBER);

CREATE TABLE SALGRADE (GRADE NUMBER, LOSAL NUMBER, HISAL NUMBER);

INSERT INTO SALGRADE VALUES (1, 700, 1200); INSERT INTO SALGRADE VALUES (2, 1201, 1400); INSERT INTO SALGRADE VALUES (3, 1401, 2000); INSERT INTO SALGRADE VALUES (4, 2001, 3000); INSERT INTO SALGRADE VALUES (5, 3001, 9999);

CREATE TABLE DUMMY (DUMMY NUMBER);

INSERT INTO DUMMY VALUES (0);

COMMIT;

SET TERMOUT ON PROMPT Demonstration table build is complete.