1. 4-1 Copyright  Oracle Corporation, 1998. All rights reserved. Data Manipulation Language (DML)

2. 4-2 Copyright  Oracle Corporation, 1998. All rights reserved. Data Manipulation Language (DML) A DML statement is executed when you: – Add new rows to a table – Modify existing rows in a table – Remove existing rows from a table A transaction consists of a collection of DML statements that form a logical unit of work. A DML statement is executed when you: – Add new rows to a table – Modify existing rows in a table – Remove existing rows from a table A transaction consists of a collection of DML statements that form a logical unit of work.

3. 4-3 Copyright  Oracle Corporation, 1998. All rights reserved. Adding Rows

4. 4-4 Copyright  Oracle Corporation, 1998. All rights reserved. Adding a New Row to a Table DEPT DEPTNO DNAME LOC ------ ------------------ 10ACCOUNTINGNEW YORK 20RESEARCHDALLAS 30SALESCHICAGO 40OPERATIONSBOSTON New row 50 DEVELOPMENT DETROIT DEPT DEPTNO DNAME LOC ------ ------------------ 10ACCOUNTINGNEW YORK 20RESEARCHDALLAS 30SALESCHICAGO 40OPERATIONSBOSTON “…insert a new row into DEPT table…” 50 DEVELOPMENT DETROIT

5. 4-5 Copyright  Oracle Corporation, 1998. All rights reserved. The INSERT Statement Add new rows to a table by using the INSERT statement. Only one row is inserted at a time with this syntax. Add new rows to a table by using the INSERT statement. Only one row is inserted at a time with this syntax. INSERT INTOtable [(column [, column...])] VALUES(value [, value...]); INSERT INTOtable [(column [, column...])] VALUES(value [, value...]);

6. 4-6 Copyright  Oracle Corporation, 1998. All rights reserved. Inserting New Rows Insert a new row containing values for each column. List values in the default order of the columns in the table. Optionally list the columns in the INSERT clause. Enclose character and date values within single quotation marks. Insert a new row containing values for each column. List values in the default order of the columns in the table. Optionally list the columns in the INSERT clause. Enclose character and date values within single quotation marks. SQL> INSERT INTOdept (deptno, dname, loc) 2 VALUES(50, 'DEVELOPMENT', 'DETROIT'); 1 row created.

7. 4-7 Copyright  Oracle Corporation, 1998. All rights reserved. Inserting Rows with Null Values Implicit method: Omit the column from the column list. SQL> INSERT INTOdept (deptno, dname ) 2 VALUES(60, 'MIS'); 1 row created. Explicit method: Specify the NULL keyword. SQL> INSERT INTOdept 2 VALUES(70, 'FINANCE', NULL); 1 row created.

8. 4-8 Copyright  Oracle Corporation, 1998. All rights reserved. Inserting Values by Using Substitution Variables Create an interactive script by using SQL*Plus substitution parameters. SQL> INSERT INTOdept (deptno, dname, loc) 2 VALUES (&department_id, 3 '&department_name', '&location'); 80 Enter value for department_id: 80 EDUCATION Enter value for department_name: EDUCATION ATLANTA Enter value for location: ATLANTA 1 row created.

9. 4-9 Copyright  Oracle Corporation, 1998. All rights reserved. Copying Rows from Another Table Write your INSERT statement with a subquery. Do not use the VALUES clause. Match the number of columns in the INSERT clause to those in the subquery. Write your INSERT statement with a subquery. Do not use the VALUES clause. Match the number of columns in the INSERT clause to those in the subquery. SQL> INSERT INTO managers(id, name, salary, hiredate) 2 SELECTempno, ename, sal, hiredate 3 FROM emp 4 WHEREjob = 'MANAGER'; 3 rows created.

10. 4-10 Copyright  Oracle Corporation, 1998. All rights reserved. Update Rows

11. 4-11 Copyright  Oracle Corporation, 1998. All rights reserved. Changing Data in a Table EMP “…update a row in EMP table…” EMP EMPNO ENAME JOB... DEPTNO 7839KINGPRESIDENT 10 7698BLAKEMANAGER 30 7782CLARKMANAGER 10 7566JONESMANAGER 20... 20 EMPNO ENAME JOB... DEPTNO 7839KINGPRESIDENT 10 7698BLAKEMANAGER 30 7782CLARKMANAGER 10 7566JONESMANAGER 20...

12. 4-12 Copyright  Oracle Corporation, 1998. All rights reserved. The UPDATE Statement Modify existing rows with the UPDATE statement. Update more than one row at a time, if required. Modify existing rows with the UPDATE statement. Update more than one row at a time, if required. UPDATEtable SETcolumn = value [, column = value] [WHERE condition]; UPDATEtable SETcolumn = value [, column = value] [WHERE condition];

13. 4-13 Copyright  Oracle Corporation, 1998. All rights reserved. Updating Rows in a Table Specific row or rows are modified when you specify the WHERE clause. All rows in the table are modified if you omit the WHERE clause. Specific row or rows are modified when you specify the WHERE clause. All rows in the table are modified if you omit the WHERE clause. SQL> UPDATE emp 2 SET deptno = 20 3 WHERE empno = 7782; 1 row updated. SQL> UPDATE employee 2 SET deptno = 20; 14 rows updated. SQL> UPDATE employee 2 SET deptno = 20; 14 rows updated.

14. 4-14 Copyright  Oracle Corporation, 1998. All rights reserved. Updating Rows Based on Another Table Use subqueries in UPDATE statements to update rows in a table based on values from another table. SQL>UPDATEemployee 2SETdeptno = (SELECTdeptno 3FROMemp 4WHEREempno = 7788) 5WHEREjob = (SELECTjob 6FROMemp 7WHEREempno = 7788); 2 rows updated. SQL>UPDATEemployee 2SETdeptno = (SELECTdeptno 3FROMemp 4WHEREempno = 7788) 5WHEREjob = (SELECTjob 6FROMemp 7WHEREempno = 7788); 2 rows updated.

15. 4-15 Copyright  Oracle Corporation, 1998. All rights reserved. UPDATE emp * ERROR at line 1: ORA-02291: integrity constraint (USR.EMP_DEPTNO_FK) violated - parent key not found UPDATE emp * ERROR at line 1: ORA-02291: integrity constraint (USR.EMP_DEPTNO_FK) violated - parent key not found SQL> UPDATEemp 2 SETdeptno = 55 3 WHEREdeptno = 10; SQL> UPDATEemp 2 SETdeptno = 55 3 WHEREdeptno = 10; Updating Rows: Integrity Constraint Error Department number 55 does not exist

16. 4-16 Copyright  Oracle Corporation, 1998. All rights reserved. Delete Rows

17. 4-17 Copyright  Oracle Corporation, 1998. All rights reserved. “…delete a row from DEPT table…” Removing a Row from a Table DEPT DEPTNO DNAME LOC ------ ------------------ 10ACCOUNTINGNEW YORK 20RESEARCHDALLAS 30SALESCHICAGO 40OPERATIONSBOSTON 50 DEVELOPMENT DETROIT 60MIS... DEPT DEPTNO DNAME LOC ------ ------------------ 10ACCOUNTINGNEW YORK 20RESEARCHDALLAS 30SALESCHICAGO 40OPERATIONSBOSTON 60MIS...

18. 4-18 Copyright  Oracle Corporation, 1998. All rights reserved. The DELETE Statement You can remove existing rows from a table by using the DELETE statement. DELETE [FROM] table [WHERE condition]; DELETE [FROM] table [WHERE condition];

19. 4-19 Copyright  Oracle Corporation, 1998. All rights reserved. Specific row or rows are deleted when you specify the WHERE clause. All rows in the table are deleted if you omit the WHERE clause. Specific row or rows are deleted when you specify the WHERE clause. All rows in the table are deleted if you omit the WHERE clause. Deleting Rows from a Table SQL> DELETE FROMdepartment 2 WHERE dname = 'DEVELOPMENT'; 1 row deleted. SQL> DELETE FROMdepartment 2 WHERE dname = 'DEVELOPMENT'; 1 row deleted. SQL> DELETE FROMdepartment; 4 rows deleted. SQL> DELETE FROMdepartment; 4 rows deleted.

20. 4-20 Copyright  Oracle Corporation, 1998. All rights reserved. Deleting Rows Based on Another Table Use subqueries in DELETE statements to remove rows from a table based on values from another table. SQL> DELETE FROMemployee 2 WHEREdeptno = 3 (SELECT deptno 4 FROM dept 5 WHERE dname ='SALES'); 6 rows deleted.

21. 4-21 Copyright  Oracle Corporation, 1998. All rights reserved. Deleting Rows: Integrity Constraint Error SQL> DELETE FROMdept 2 WHEREdeptno = 10; SQL> DELETE FROMdept 2 WHEREdeptno = 10; DELETE FROM dept * ERROR at line 1: ORA-02292: integrity constraint (USR.EMP_DEPTNO_FK) violated - child record found DELETE FROM dept * ERROR at line 1: ORA-02292: integrity constraint (USR.EMP_DEPTNO_FK) violated - child record found You cannot delete a row that contains a primary key that is used as a foreign key in another table.