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:
If you are referencing cell (C2)in Excel and want to be able to copy the formula and keep using the data in cell C2 in every place you copy it to, the way to reference the cell? is known to be $C$2.
<h3>What is a cell reference in Excel?</h3>
A cell reference is known to be called a cell address and this is seen as a make up of a column letter and also those of row number that tells a cell on a worksheet.
Hence, If you are referencing cell (C2)in Excel and want to be able to copy the formula and keep using the data in cell C2 in every place you copy it to, the way to reference the cell? is known to be $C$2.
Learn more about cell referencing from
brainly.com/question/19035038
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The union of two tables is basically the total of the two tables, so "or" questions would be my guess.
B.Interact more with people from different backgrounds. this is correct because that would help people get to know each other better.
Hope this helps:)
Answer:
Option D: If it is the month of January, then the temperature is cool.
Explanation:
A conditional statement is the one having an if condition in it that says, if the condition is true proceed to the next statement, else not.
Given statements are:
- If it is the month of January, then it is winter.
This can be written as: if (January)⇒Winter
- If it is winter, then the temperature is cool.
This can be written as: if (winter)⇒ Temperature(cool)
So by combining both the statements, the winter clause will be connected and we get:
if(January)⇒Temperature (cool)
This can be written as:
- If it is the month of January, then the temperature is cool.
So, Option D is the correct answer.
i hope it will help you!
