What is meant by modification of database?

What is a modification problem in database?

A modification problem is a data corruption or loss that occurs when a table uses one row to store facts about two or more themes. In this case, a deletion of a row can remove facts about two or more themes, leading to a loss in data, or a data change must be made in multiple rows to maintain data consistency.

Which of the following is modification of the database?

A is a pictorial depiction of the schema of a database that shows the relations in the database, their attributes, and primary keys and foreign keys. ... Q.Which of the following is not Modification of the DatabaseB.insertionC.sortingD.updatingAnswer» c. sorting

What is queries and modification?

, to execute your query, a database engine should be able to rewrite the query over the virtual relations (like your view) to one using the base relations, since that what is actually stored: SELECT * FROM mytable JOIN othertable ON otherid = myid WHERE mycolumn = 1. This process is called query modification.

What does modifying a table means?

Elements in a table can be inserted, changed, and deleted. These functions are all performed by the WRITE/TABLE or COPY commands (See Table 5.4). The element to be modified must be defined by giving its column and row location. An element is deleted if the value is set to NULL.