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In other words, Secondary key in DBMS is a column or a set of columns in a table that uniquely identifies each row in a table that is not the primary key. Secondary keys are also called alternate keys as they can also be used alternatively in place of the primary key.
22 wrz 2020 · Secondary Key : It is a candidate key that is not selected as primary key. For example, we have schema: Student(Id, email, enroll_no, name) Candidate key of this relation is: ID, email, enroll_no
18 lip 2021 · Apabila primary key berfungsi untuk menjalankan fungsi pertama dari key dalam database, yakni sebagai ‘tanda pengenal’, maka foreign key berfungsi untuk menjalankan fungsi kedua dari key dalam database, yakni sebagai penghubung antartabel.
21 paź 2023 · Pengertian Primary Key. Primary Key adalah atribut atau kumpulan atribut yang digunakan untuk mengidentifikasi setiap baris data dalam sebuah tabel secara unik.
29 sty 2014 · The primary key will probably be implemented with a primary key constraint; the candidate keys will probably be implemented with unique constraints. A foreign key is an instance of one entity's candidate key in another entity, representing a relationship between the two entities.
30 lis 2023 · A secondary key provides a secondary reference point for objects whose primary keys do not adequately distinguish them for reference purposes. It is used for identification of rows but not usually unique. We can have multiple secondary key per table.
1 cze 2018 · Secondary Key. A field or combination of fields that is basis for retrieval is known as secondary key (mainly used for finding details from large data) like an index page of a book. Foreign Key. A field used to refer records in another table(primary key of refered table )
