![]() We hope that this EDUCBA information on “PostgreSQL Primary Key” was beneficial to you. Also, with the help of examples and syntax explained in detail. We hope from the above article you have understood how to add, update and remove primary key constraints using CREATE TABLE and ALTER TABLE statements. By using PostgreSQL PRIMARY KEY, we can avoid duplicate row insertion in the table.The PostgreSQL PRIMARY KEY is used to sort the data based on it.By using PostgreSQL PRIMARY KEY, we can uniquely identify the table records for an update or delete operation.The PostgreSQL PRIMARY KEY helps us to search records quickly as the index is getting used based on the PRIMARY KEY.In order to remove the primary key constraint of the invoices table, we have to use the following statement:ĭROP CONSTRAINT invoices_pkey Advantages of using Primary Key in PostgreSQL Now the invoices table has the primary key invoice_id.Įxample #5 – Remove a PRIMARY KEY of the table.Illustrate the result of an ALTER statement with the help of the following SQL statement and snapshot.Ĭode: SELECT invoice_id,invoice_data FROM invoices. ![]()
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