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for example, if you disable primary key constraint, it is possible to enter the duplicate value in primary key column and commit the same data in table. Problem will arise if you try to enable the primary key. If your table is small it easy to judge what rows have invalid values but this problem will become a junk when your table is big, say millions of row. but not to worry oracle database has a process to identify those row which have some invalid data as per the constraints.

while enabling the constraint, we can detect all rows which may have some invalid data.

Foreign key constraints may be created by referencing a primary or unique key.

Foreign key constraints ensure the relational integrity of data in associated tables.

Lessons will explain not only how to perform various monitoring tasks, but why and when you should use them.

DROP TABLE Table1 CASCADE; CREATE TABLE Table1( "Data ID" bigint NOT NULL DEFAULT '0', "Ad Data" integer DEFAULT NULL, PRIMARY KEY ("Data ID") ); DROP TABLE IF EXISTS Table2 CASCADE; CREATE TABLE Table2 ( "Address" numeric(20) NOT NULL DEFAULT '0', "Value" numeric(20) DEFAULT NULL, PRIMARY KEY ("Address") ); DROP TABLE IF EXISTS Table3 CASCADE; CREATE TABLE table3 ( "ID" bigint NOT NULL DEFAULT '0', "Data ID" bigint DEFAULT NULL, "Address" numeric(20) DEFAULT NULL, "Data" bigint DEFAULT NULL, PRIMARY KEY ("ID"), FOREIGN KEY ("Data ID") REFERENCES Table1("Data ID") on delete cascade on update cascade, FOREIGN KEY ("Address") REFERENCES Table2("Address") on delete cascade on update cascade ); DROP TABLE Table1 CASCADE; CREATE TABLE Table1( "Data ID" bigint NOT NULL DEFAULT '0', "Ad Data" integer DEFAULT NULL, PRIMARY KEY ("Data ID") ); DROP TABLE IF EXISTS Table2 CASCADE; CREATE TABLE Table2 ( "Address" numeric(20) NOT NULL DEFAULT '0', "Value" numeric(20) DEFAULT NULL, PRIMARY KEY ("Address") ); DROP TABLE IF EXISTS Table3 CASCADE; CREATE TABLE table3 ( "ID" bigint NOT NULL DEFAULT '0', "Data ID" bigint DEFAULT NULL REFERENCES Table1 ON DELETE RESTRICT, "Address" numeric(20) DEFAULT NULL REFERENCES Table2 ON DELETE CASCADE, "Data" bigint DEFAULT NULL, PRIMARY KEY ("ID"), PRIMARY KEY("Data ID", "Address") ); There are a few problems with your tables.

These are used to maintain integrity among related data in different tables.

How can these rules be used effectively without threatening the relational integrity?In this table we can generate ROWID of all the rows by which we are getting the exception whenever we enabling it. Type ----------------------------------------- -------- ---------------------------- ROW_ID ROWID OWNER VARCHAR2(30) TABLE_NAME VARCHAR2(30) CONSTRAINT VARCHAR2(30)Before we start every time the exception we should check, EXCEPTION table should not have any row. Let us check output table for those potential set of ROWIDs which are violating the constraints.We can avoid ambiguity if we are doing same things on multiple table. SQL alter table con enable constraint con_pr exceptions into exceptions;alter table con enable constraint con_pr exceptions into exceptions*ERROR at line 1: ORA-02437: cannot validate (HR. we can examine ROW_ID, CONSTRAINT columns to verify it.We could also create a primary key with more than one field as in the example below: In this example, we've created a primary key on the existing supplier table called supplier_pk. External tables must be qualified by an external schema name.

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You can also specify a view name if you are using the ALTER TABLE statement to rename a view or change its owner.

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