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Query is a question or requesting information. Query language is a language which is used to retrieve information from a database.

Query language is divided into two types −

Procedural language

Non-procedural language

Information is retrieved from the database by specifying the sequence of operations to be performed.

For Example − Relational algebra.

Structure Query language (SQL) is based on relational algebra.

Relational algebra consists of a set of operations that take one or two relations as an input and produces a new relation as output.

The different types of relational algebra operations are as follows −

Select operation

Project operation

Rename operation

Union operation

Intersection operation

Difference operation

Cartesian product operation

Join operation

Division operation

Union, intersection, difference, cartesian, join, division comes under binary operation (operate on two tables).

It combines R1 and R2 without any condition. It is denoted by X.

Degree of R1 XR2 = degree of R1 + degree of R2

{degree = total no of columns}

Consider R1 table −

RegNo | Branch | Section |
---|---|---|

1 | CSE | A |

2 | ECE | B |

3 | CIVIL | A |

4 | IT | B |

Name | RegNo |
---|---|

Bhanu | 2 |

Priya | 4 |

RegNo | Branch | Section | Name | RegNo |
---|---|---|---|---|

1 | CSE | A | Bhanu | 2 |

1 | CSE | A | Priya | 4 |

2 | ECE | B | Bhanu | 2 |

2 | ECE | B | Priya | 4 |

3 | CIVIL | A | Bhanu | 2 |

3 | CIVIL | A | Priya | 4 |

4 | IT | B | Bhanu | 2 |

4 | IT | B | Priya | 4 |

- Related Questions & Answers
- Explain the relational algebra in DBMS?
- Explain rename operation in relational algebra (DBMS)?
- Explain project operation in relational algebra (DBMS)?
- Explain intersection operation in relational algebra (DBMS)?
- Explain union operation in relational algebra (DBMS)?
- Explain division operation in relational algebra (DBMS)?
- Explain the select operation in relational algebra (DBMS)?
- Explain the binary operations in relational algebra (DBMS)?
- Explain the evaluation of relational algebra expression(DBMS)
- What is join operation in relational algebra (DBMS)?
- Write queries using aggregate functions in relational algebra (DBMS)?
- Explain the Relational Model in DBMS?
- Difference between Relational Algebra and Relational Calculus
- Basic Operators in Relational Algebra
- Explain the unary operations of algebra relations in DBMS?

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