**Contents**show

## What are different types of operators?

**There are three types of operator that programmers use:**

- arithmetic operators.
- relational operators.
- logical operators.

## What are the operations performed in SQL?

**Common SQL Operations**

- Selecting all columns. The most basic query to a table is requesting all rows and columns. …
- Selecting some columns. …
- Selecting distinct values. …
- Filtering numeric fields. …
- Filtering character fields. …
- Filtering a range. …
- Combining character and numeric filters. …
- Ordering results.

## What are SQL operators and how do they work?

SQL operators are **reserved keywords used in the WHERE clause of a SQL statement to perform arithmetic, logical and comparison operations**. Operators act as conjunctions in SQL statements to fulfill multiple conditions in a statement.

## What does operator do in SQL?

An operator is a **keyword used in SQL queries to manipulate the data**, and it returns the results based on the functionality of that operator. These operators allow us to perform multiple functionalities like performing arithmetic operations, comparing two expressions, etc.

## What are the four operators?

There are four different types of calculation operators: **arithmetic, comparison, text concatenation, and reference**.

## What are the 6 relational operators?

There are six types of relational operators: **equal, greater than, less than, greater than or equal to, less than or equal to, and not equal to**. Each of these operators can be used to compare the values of the variables. The result of each of these operators is either true or false.

## What set difference operations?

**To perform difference operation, the following conditions must hold;**

- Both the relations R
_{1}and R_{2}(or the result of expression 1 and expression 2) must have the same number of attributes. That is, Arity should be same. - The domain of i
^{th}attribute of R_{1}and i^{th}attribute of R_{2}must be same for all i.

## What do you mean by self join?

A self-join, also known as an inner join, is **a structured query language (SQL) statement where a queried table is joined to itself**. The self-join statement is necessary when two sets of data, within the same table, are compared.

## What is == in SQL?

**Performs a comparison to determine if two expressions are equal**.

## What is the OR operator in SQL?

The SQL Server OR is **a logical operator that allows you to combine two Boolean expressions**. It returns TRUE when either of the conditions evaluates to TRUE . In this syntax, the boolean_expression is any valid Boolean expression that evaluates to true, false, and unknown.

## Which is a comparison operator in SQL?

In this article

Operator | Meaning |
---|---|

= (Equals) | Equal to |

> (Greater Than) | Greater than |

< (Less Than) | Less than |

>= (Greater Than or Equal To) | Greater than or equal to |

## What are the commands of DDL?

**Data Definition Language (DDL) commands:**

- CREATE to create a new table or database.
- ALTER for alteration.
- Truncate to delete data from the table.
- DROP to drop a table.
- RENAME to rename a table.

## Is there an OR operator in SQL?

The OR operator is **used to combine multiple conditions in an SQL statement’s WHERE clause**. The NULL operator is used to compare a value with a NULL value.