Oracle Database Data Definition Language (DDL) Commands:

In this section, we will try to explain about important database DROP commands that are used by a data modeler by relating it with our example data.

Drop Index:

DROP INDEX IND_SSN;

Drop Synonym:

DROP SYNONYM SYN_EMPLOYEE_DTL;

Drop View:

DROP VIEW VIEW_EMPLOYEE_DTL;

Drop Sequence:

DROP SEQUENCE SEQ_EMPLOYEE_DTL;

Drop Trigger:

DROP TRIGGER TRG_SEQ_EMPLOYEE_DTL;

Drop Table:

DROP TABLE EMPLOYEE_DTL;

Drop Table with Cascading Option:

In our example tables, try to drop tables GENDER_LKP, and DEPARTMENT_LKP after the data is loaded into GENDER_LKP, DEPARTMENT_LKP, and EMPLOYEE_DTL. You will get an error message. If you want to drop parent tables, that are connected with child tables, you can use the following command.

DROP TABLE GENDER_LKP CASCADE CONSTRAINTS;
DROP TABLE DEPARTMENT_LKP CASCADE CONSTRAINTS;

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DML Statements       Other Important Commands

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