sql10 - 10 10 Creating Views 12-2 Objectives After...

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Unformatted text preview: 10 10 Creating Views 12-2 Objectives After completing this lesson, you should After completing this lesson, you should be able to do the following: be able to do the following: • Describe a view • Create a view • Retrieve data through a view • Alter the definition of a view • Insert, update, and delete data through a view • Drop a view 12-3 Database Objects Description Basic unit of storage; composed of rows and columns Logically represents subsets of data from one or more tables Generates primary key values Improves the performance of some queries Alternative name for an object Object Table View Sequence Index Synonym 12-4 What Is a View? EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO----- ------- --------- ----- --------- ----- ----- -------7839 KING PRESIDENT 17-NOV-81 5000 10 7698 BLAKE MANAGER 7839 01-MAY-81 2850 30 7782 CLARK MANAGER 7839 09-JUN-81 2450 10 7566 JONES MANAGER 7839 02-APR-81 2975 20 7654 MARTIN SALESMAN 7698 28-SEP-81 1250 1400 30 7499 ALLEN SALESMAN 7698 20-FEB-81 1600 300 30 7844 TURNER SALESMAN 7698 08-SEP-81 1500 0 30 7900 JAMES CLERK 7698 03-DEC-81 950 30 7521 WARD SALESMAN 7698 22-FEB-81 1250 500 30 7902 FORD ANALYST 7566 03-DEC-81 3000 20 7369 SMITH CLERK 7902 17-DEC-80 800 20 7788 SCOTT ANALYST 7566 09-DEC-82 3000 20 7876 ADAMS CLERK 7788 12-JAN-83 1100 20 7934 MILLER CLERK 7782 23-JAN-82 1300 10 EMP Table EMP Table JOB SAL COMM DEPTNO----- -------- --------- ---- --------- ------ ----- -------7839 KING PRESIDENT 5000 10 7782 CLARK MANAGER 7839 09-JUN-81 1500 300 10 7934 MILLER CLERK 7782 23-JAN-82 1300 10 7566 JONES MANAGER 2975 20 7788 SCOTT ANALYST 7566 09-DEC-82 3000 20 7876 ADAMS CLERK 7788 12-JAN-83 1100 20 7369 SMITH CLERK 7902 17-DEC-80 800 20 7902 FORD ANALYST 7566 03-DEC-81 3000 20 7698 BLAKE MANAGER 7839 01-MAY-81 2850 30 7654 MARTIN SALESMAN 7698 28-SEP-81 1250 1400 30 7499 ALLEN SALESMAN 7698 20-FEB-81 1600 300 30 7844 TURNER SALESMAN 7698 08-SEP-81 1500 0 30 7900 JAMES CLERK 7698 03-DEC-81 950 30 7521 WARD SALESMAN 7698 22-FEB-81 1250 500 30 EMPNO ENAME JOB...
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This note was uploaded on 07/15/2011 for the course ECO 2023 taught by Professor Mr.raza during the Summer '10 term at FAU.

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sql10 - 10 10 Creating Views 12-2 Objectives After...

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