Answer:
See the attached picture.
Explanation:
See the attached picture.
Answer:
A primary key is a special relational database table column (or combination of columns) designated to uniquely identify each table record. A primary key is used as a unique identifier to quickly parse data within the table. A table cannot have more than one primary key.
Primary Key.
Candidate Key.
Alternate Key.
Super Key.
Composite Key.
Foreign Key.
Unique Key.
In the relational model of databases, a primary key is a specific choice of a minimal set of attributes that uniquely specify a tuple in a relation. Informally, a primary key is "which attributes identify a record," and in simple cases constitute a single attribute: a unique ID.
Explanation:
i am sup by the way. so im guessing i win?
Answer:
c) 4.4
Explanation:
You can evaluate step by step the code. You know tha your input is 4.0
Step 1 Variables definitions:
double tax;
double total;
Step 2 Ask the user for the input:
System.out.print("Enter the cost of the item");
Step 3 read de input:
total = scan.nextDouble();
Step 4 evaluate the condition ( is the input greater or equal than 3.0 ? [True])
if ( total >= 3.0)
Step 5 get done the operations inside the condition and print it:
tax = 0.10;
System.out.println(total + (total * tax));