Question

plz give answers in sequence ​

Answer 1

Answer:

In DBMS, the table is known as relation and row as a tuple.

columns are called fields and the rows are called records.

Primary key of one relation used as an attribute in another relation is called foreign key.

A Composite key is a Candidate key or Primary key that consists of more than one attribute.

short answer questions :

1- A foreign key is a column or a set of columns in one table that references the primary key columns in another table. The primary key is defined as a column (or set of columns) where each value is unique and identifies a single row of the table.

2- Rolls back an explicit or implicit transaction to the beginning of the transaction, or to a savepoint inside the transaction. You can use ROLLBACK TRANSACTION to erase all data modifications made from the start of the transaction or to a savepoint. It also frees resources held by the transaction.

3- 'DDL' stands for Data Definition Language.'DCL' stands for data control language.'TCL' stands for Transaction Control Languages.

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