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This Oracle tutorial explains how to create, drop, disable, and enable a primary key in Oracle with syntax and examples.

In Oracle, a primary key is a single field or combination of fields that uniquely defines a record.

A foreign key value may be NULL and indicates a particular record has no parent record.

But if a value exists, then it is bound to have an associated value in a parent table.

SQL alter table con enable constraint con_pr;alter table con enable constraint con_pr*ERROR at line 1: ORA-02437: cannot validate (HR.

CON_PR) - primary key violated To detect all row which are violating the primary key constraint, we need to have an output table EXCEPTIONS.

Of course, the definition of 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 ); . The column name and the data type suggests that this address can change in the future.You cannot rename a permanent table to a name that begins with '#'.A table name beginning with '#' indicates a temporary table.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.