Question

5th ka answer chahiye ​

Answer 1

Answer:

Explanation:

A foreign key can refer to columns in another table, that are Primary key only. In a foreign key reference, a link is created between two tables when the column or columns that hold the primary key value for one table are referenced by the column or columns in another table

Answer 2

Answer:

Explanation:

key is a taxanomic aid helpful in identification of plants and animals based on similarities and dissimilarities.

there are usually based on contrasting characters generally in a pair called couplet.

eaach statement in a key is called a lead