Question

) Write any 2 rules for naming a field. 2) Define Primary key. 3) Write any two functions of a DBMS. 4) Describe Database view. 5) Define Query
pls tell fast

Answer 1

Answer:

There are several rules that a primary key must follow: There is only one primary key for each table. If the primary key is a column, the value of this column must be unique and it must not NULL . If the primary key consists of multiple columns, each combination of values in these columns must be unique

Answer 2

Answer:

KEYS in DBMS is an attribute or set of attributes which helps you to identify a row(tuple) in a relation(table). They allow you to find the relation between two tables. Keys help you uniquely identify a row in a table by a combination of one or more columns in that table. Key is also helpful for finding unique record or row from the table. Database key is also helpful for finding unique record or row from the table.