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What is a foreign key, and what is it used for?
A foreign key is used to establish relationships between relations in the relational model. Technically, a foreign key is a column (or columns) appearing in one relation that is (are) the primary key of another table. Although there might be exceptions, the values in the foreign key columns usually must correspond to values existing in the set of primary key values. This correspondence necessity is created in a database using a referential integrity constraint on the foreign key.
What is the full form of DDL? DDL is stand for Data Definition Language.
Which method of access uses key transformation? A Hash method of access uses key transformation.
Define database management system? Database management system (DBMS) is a set of interrelated data and a combination of programs to access those data.
Give an example of operations from the State Actions and Activities. For instance, in bank the activity verify account code and verify password
State about the Tables- DBMS Data is stored in columns and rows (much like a spreadsheet -main difference is how data is organised). Every row in a table is known as a record
#questiontypes of keys examples..
Where does view definition stored? A view definition is permanently stored as part of the database.
Problem 1 What is a Data Warehouse? Mention its advantages 2 Explain the Top-Down and Bottom-up Data Warehouse development Methodologies 3 What is Data Transformation? Ex
Mention the purpose of SID and SOD lines SID (Serial input data line): It is an input line by which the microprocessor accepts serial data. SOD (Serial output data line)
it can be possible to create any table without primary key
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