Question

which key is used to make table creation​

Answer 1

Answer:

dont kno et width be x

so length = 2x

as we know perimeter of a rectangle= 2(length+breadth)

so  2(2x+x)=60

     2(3x)= 60

     2* 3x=60

     6x=60

     x=60/6

     x=10

Since x= width

length= 2x

so length= 2*10=20

Explanation:

Answer 2

Explanation:

primary key

When you create a table in SQL, you usually want to specify an id column to be the primary key. That will make that value the unique identifier for the row in the table.