What is the point in having multiple columns in ORDER BY clause?
DB version:10gR2
When using ORDER BY clause, the rows are always sorted according to the first column in the ORDER BY clause. So, what is point in having multiple columns in the ORDER BY clause(i always see this in production codes)?
For the below SQLs' from SCOTT schema, the result sets are always ordered according the first column ename. When i added job asc and job desc, the result set doesn't change.
SQL> select * from emp order by ename;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
7876 ADAMS CLERK 7788 23-MAY-87 1100 20
7499 ALLEN SALESMAN 7698 20-FEB-81 1600 300 30
7698 BLAKE MANAGER 7839 01-MAY-81 2850 30
7782 CLARK MANAGER 7839 09-JUN-81 2450 20
7902 FORD ANALYST 7566 03-DEC-81 3000 20
7900 JAMES CLERK 7698 03-DEC-81 950 30
7566 JONES MANAGER 7839 02-APR-81 2975 20
7839 KING PRESIDENT 17-NOV-81 5000 20
7654 MARTIN SALESMAN 7698 28-SEP-81 1250 1400 30
7934 MILLER CLERK 7782 23-JAN-82 1300 20
7788 SCOTT ANALYST 7566 19-APR-87 3000 20
7369 SMITH CLERK 7902 17-DEC-80 800 20
7844 TURNER SALESMAN 7698 08-SEP-81 1500 0 30
7521 WARD SALESMAN 7698 22-FEB-81 1250 500 30
14 rows selected.
SQL> select * from emp order by ename, job;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
7876 ADAMS CLERK 7788 23-MAY-87 1100 20
7499 ALLEN SALESMAN 7698 20-FEB-81 1600 300 30
7698 BLAKE MANAGER 7839 01-MAY-81 2850 30
7782 CLARK MANAGER 7839 09-JUN-81 2450 20
7902 FORD ANALYST 7566 03-DEC-81 3000 20
7900 JAMES CLERK 7698 03-DEC-81 950 30
7566 JONES MANAGER 7839 02-APR-81 2975 20
7839 KING PRESIDENT 17-NOV-81 5000 20
7654 MARTIN SALESMAN 7698 28-SEP-81 1250 1400 30
7934 MILLER CLERK 7782 23-JAN-82 1300 20
7788 SCOTT ANALYST 7566 19-APR-87 3000 20
7369 SMITH CLERK 7902 17-DEC-80 800 20
7844 TURNER SALESMAN 7698 08-SEP-81 1500 0 30
7521 WARD SALESMAN 7698 22-FEB-81 1250 500 30
14 rows selected.
SQL> select * from emp order by ename, job desc;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
7876 ADAMS CLERK 7788 23-MAY-87 1100 20
7499 ALLEN SALESMAN 7698 20-FEB-81 1600 300 30
7698 BLAKE MANAGER 7839 01-MAY-81 2850 30
7782 CLARK MANAGER 7839 09-JUN-81 2450 20
7902 FORD ANALYST 7566 03-DEC-81 3000 20
7900 JAMES CLERK 7698 03-DEC-81 950 30
7566 JONES MANAGER 7839 02-APR-81 2975 20
7839 KING PRESIDENT 17-NOV-81 5000 20
7654 MARTIN SALESMAN 7698 28-SEP-81 1250 1400 30
7934 MILLER CLERK 7782 23-JAN-82 1300 20
7788 SCOTT ANALYST 7566 19-APR-87 3000 20
7369 SMITH CLERK 7902 17-DEC-80 800 20
7844 TURNER SALESMAN 7698 08-SEP-81 1500 0 30
7521 WARD SALESMAN 7698 22-FEB-81 1250 500 30
14 rows selected.
Because there is only one employee with the name SCOTT,FORD ...etc in the emp table and your first column in the order by list is ename
you spot the difference now
SQL> select * from emp order by job;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
7788 SCOTT ANALYST 7566 19-APR-87 00:00:00 3000 20
7902 FORD ANALYST 7566 03-DEC-81 00:00:00 3000 20
7934 MILLER CLERK 7782 23-JAN-82 00:00:00 1300 10
7900 JAMES CLERK 7698 03-DEC-81 00:00:00 950 30
7369 SMITH CLERK 7902 17-DEC-80 00:00:00 800 20
7876 ADAMS CLERK 7788 23-MAY-87 00:00:00 1100 20
7698 BLAKE MANAGER 7839 01-MAY-81 00:00:00 2850 30
7566 JONES MANAGER 7839 02-APR-81 00:00:00 2975 20
7782 CLARK MANAGER 7839 09-JUN-81 00:00:00 2450 10
7839 KING PRESIDENT 17-NOV-81 00:00:00 5000 10
7844 TURNER SALESMAN 7698 08-SEP-81 00:00:00 1500 0 30
7654 MARTIN SALESMAN 7698 28-SEP-81 00:00:00 1250 1400 30
7521 WARD SALESMAN 7698 22-FEB-81 00:00:00 1250 500 30
7499 ALLEN SALESMAN 7698 20-FEB-81 00:00:00 1600 300 30
14 rows selected.
Elapsed: 00:00:00.00
SQL> select * from emp order by job, deptno asc;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
7902 FORD ANALYST 7566 03-DEC-81 00:00:00 3000 20
7788 SCOTT ANALYST 7566 19-APR-87 00:00:00 3000 20
7934 MILLER CLERK 7782 23-JAN-82 00:00:00 1300 10
7369 SMITH CLERK 7902 17-DEC-80 00:00:00 800 20
7876 ADAMS CLERK 7788 23-MAY-87 00:00:00 1100 20
7900 JAMES CLERK 7698 03-DEC-81 00:00:00 950 30
7782 CLARK MANAGER 7839 09-JUN-81 00:00:00 2450 10
7566 JONES MANAGER 7839 02-APR-81 00:00:00 2975 20
7698 BLAKE MANAGER 7839 01-MAY-81 00:00:00 2850 30
7839 KING PRESIDENT 17-NOV-81 00:00:00 5000 10
7654 MARTIN SALESMAN 7698 28-SEP-81 00:00:00 1250 1400 30
7844 TURNER SALESMAN 7698 08-SEP-81 00:00:00 1500 0 30
7521 WARD SALESMAN 7698 22-FEB-81 00:00:00 1250 500 30
7499 ALLEN SALESMAN 7698 20-FEB-81 00:00:00 1600 300 30
14 rows selected.
Elapsed: 00:00:00.01
SQL> select * from emp order by job,deptno desc;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
7902 FORD ANALYST 7566 03-DEC-81 00:00:00 3000 20
7788 SCOTT ANALYST 7566 19-APR-87 00:00:00 3000 20
7900 JAMES CLERK 7698 03-DEC-81 00:00:00 950 30
7369 SMITH CLERK 7902 17-DEC-80 00:00:00 800 20
7876 ADAMS CLERK 7788 23-MAY-87 00:00:00 1100 20
7934 MILLER CLERK 7782 23-JAN-82 00:00:00 1300 10
7698 BLAKE MANAGER 7839 01-MAY-81 00:00:00 2850 30
7566 JONES MANAGER 7839 02-APR-81 00:00:00 2975 20
7782 CLARK MANAGER 7839 09-JUN-81 00:00:00 2450 10
7839 KING PRESIDENT 17-NOV-81 00:00:00 5000 10
7844 TURNER SALESMAN 7698 08-SEP-81 00:00:00 1500 0 30
7654 MARTIN SALESMAN 7698 28-SEP-81 00:00:00 1250 1400 30
7521 WARD SALESMAN 7698 22-FEB-81 00:00:00 1250 500 30
7499 ALLEN SALESMAN 7698 20-FEB-81 00:00:00 1600 300 30
14 rows selected.
Elapsed: 00:00:00.01
SQL>
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What is the point of Precision and Scale in Number Type?
Version :11.2
What is the point in having PRECISION and SCALE in number type? If you create the column with just NUMBER ie.without
specifying precision or scale , you can enter numbers with any precision and scale.
SQL> select * From v$version where rownum < 2;
BANNER
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
SQL> create table t1 (col1 number);
Table created.
SQL> insert into t1 values (223.9939394);
1 row created.
SQL> insert into t1 values (88.228384);
1 row created.
SQL> insert into t1 values (9.34);
1 row created.
SQL> insert into t1 values (000.00);
1 row created.
SQL> commit;
Commit complete.
SQL> select * from t1;
COL1
223.993939
88.228384
9.34
0Did you ever have a business scenario where a Numerical column should store values only with a fixed precision and scale ?Omega3 wrote:
Version :11.2
What is the point in having PRECISION and SCALE in number type? If you create the column with just NUMBER ie.without
specifying precision or scale , you can enter numbers with any precision and scale.
SQL> select * From v$version where rownum < 2;
BANNER
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
SQL> create table t1 (col1 number);
Table created.
SQL> insert into t1 values (223.9939394);
1 row created.
SQL> insert into t1 values (88.228384);
1 row created.
SQL> insert into t1 values (9.34);
1 row created.
SQL> insert into t1 values (000.00);
1 row created.
SQL> commit;
Commit complete.
SQL> select * from t1;
COL1
223.993939
88.228384
9.34
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A unit of length may required to be stored in metres with 2 decimal places for centimetres
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etc.
etc.
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What's the point of having a "contact support" button when all you get is an automatic email response like this? "Thank you for contacting BlackBerry(r) App World(tm) support. This is an automated response to your inquiry. Direct support is unavailable through the "Contact Support" button"? Direct support is not available through "contact support"?!?!??! WT? This kind of "customer support" will have me looking at Androids and iPhones when my contract is up in June..
And when you get an Android or iPhone, don't you contact your carrier for front-line support, just like with a BlackBerry? And does Android and iPhone offer support forums such as this one? (Perhaps they do, I'm just asking.)
Fact is, when you download an app from AppWorld, the "contact support" button does work for apps developed by third-party developers. Because AppWorld itself is a BlackBerry product, that would go through your carrier or here.
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