Mark tiek () for true and cross (X) for false statements:
1. The data remains in an organised order in a database.
2. The concept of relational database was given by EF. Codd at
IBM is 1970.
3. Objects of a database are stored different files.
4. A value is located at the intersection of a column and a row
5. A primary key does not allow Null Values.
Answers
Answer:
1.(×) -Argument is correct.
2.(√) Codd at IBM in 1970. Codd introduced the term in his research paper "A Relational Model of Data for Large Shared Data Banks".
3.(√) File storage organizes and represents data as a hierarchy of files in folders; block storage chunks data into arbitrarily organized, evenly sized volumes; and object storage manages data and links it to associated metadata.
4. (×)The INTERSECTION of a row and column is called a CELL.
5.(√) A primary key defines the set of columns that uniquely identifies rows in a table. When you create a primary key constraint, none of the columns included in the primary key can have NULL constraints; that is, they must not permit NULL values. NULL values are not allowed.
Explanation:
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