Rules of precedence rules of precedence ename job sal

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Rules of Precedence Rules of Precedence ENAME JOB SAL ---------- --------- --------- KING PRESIDENT 5000 MARTIN SALESMAN 1250 ALLEN SALESMAN 1600 TURNER SALESMAN 1500 WARD SALESMAN 1250 ENAME JOB SAL ---------- --------- --------- KING PRESIDENT 5000 MARTIN SALESMAN 1250 ALLEN SALESMAN 1600 TURNER SALESMAN 1500 WARD SALESMAN 1250 SQL> SELECT ename, job, sal 2 FROM emp 3 WHERE job='SALESMAN' 4 OR job='PRESIDENT' 5 AND sal>1500;
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2-21 Copyright Oracle Corporation, 1998. All rights reserved. Rules of Precedence Rules of Precedence ENAME JOB SAL ---------- --------- --------- KING PRESIDENT 5000 ALLEN SALESMAN 1600 ENAME JOB SAL ---------- --------- --------- KING PRESIDENT 5000 ALLEN SALESMAN 1600 Use parentheses to force priority. Use parentheses to force priority. Use parentheses to force priority. Use parentheses to force priority. SQL> SELECT ename, job, sal 2 FROM emp 3 WHERE (job='SALESMAN' 4 OR job='PRESIDENT') 5 AND sal>1500;
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2-22 Copyright Oracle Corporation, 1998. All rights reserved. ORDER BY Clause ORDER BY Clause Sort rows with the ORDER BY clause ASC: ascending order, default DESC: descending order The ORDER BY clause comes last in the SELECT statement. Sort rows with the ORDER BY clause ASC: ascending order, default DESC: descending order The ORDER BY clause comes last in the SELECT statement. SQL> SELECT ename, job, deptno, hiredate 2 FROM emp 3 ORDER BY hiredate; ENAME JOB DEPTNO HIREDATE ---------- --------- --------- --------- SMITH CLERK 20 17-DEC-80 ALLEN SALESMAN 30 20-FEB-81 ... 14 rows selected.
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2-23 Copyright Oracle Corporation, 1998. All rights reserved. Sorting in Descending Order Sorting in Descending Order SQL> SELECT ename, job, deptno, hiredate 2 FROM emp 3 ORDER BY hiredate DESC; ENAME JOB DEPTNO HIREDATE ---------- --------- --------- --------- ADAMS CLERK 20 12-JAN-83 SCOTT ANALYST 20 09-DEC-82 MILLER CLERK 10 23-JAN-82 JAMES CLERK 30 03-DEC-81 FORD ANALYST 20 03-DEC-81 KING PRESIDENT 10 17-NOV-81 MARTIN SALESMAN 30 28-SEP-81 ... 14 rows selected.
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2-24 Copyright Oracle Corporation, 1998. All rights reserved. Sorting by Column Alias Sorting by Column Alias SQL> SELECT empno, ename, sal*12 annsal 2 FROM emp 3 ORDER BY annsal; EMPNO ENAME ANNSAL --------- ---------- --------- 7369 SMITH 9600 7900 JAMES 11400 7876 ADAMS 13200 7654 MARTIN 15000 7521 WARD 15000 7934 MILLER 15600 7844 TURNER 18000 ... 14 rows selected.
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2-25 Copyright Oracle Corporation, 1998. All rights reserved. Sorting by Multiple Columns Sorting by Multiple Columns The order of ORDER BY list is the order of sort. The order of ORDER BY list is the order of sort. You can sort by a column that is not in the SELECT list. You can sort by a column that is not in the SELECT list.
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