what is – Page 148

SQL NOT Operator for Beginners

December 1, 2020 by Ian

In SQL, the NOT operator negates a Boolean input (it reverses the value of any Boolean expression). Therefore it returns TRUE when the expression is FALSE.

SQL BETWEEN Operator for Beginners

December 1, 2020 by Ian

In SQL, the BETWEEN operator allows you to check for values that are within a given range.

The BETWEEN operator specifies a range to test, and it returns TRUE when the operand is within the range of comparisons.

SQL AND Operator for Beginners

November 30, 2020 by Ian

In SQL, the AND operator allows you to check for multiple conditions when filtering your queries.

The AND operator combines two Boolean expressions and returns TRUE when both expressions are TRUE.

SQL OR Operator for Beginners

November 30, 2020November 30, 2020 by Ian

In SQL, the OR operator allows you to use alternative conditions when filtering your queries.

The OR operator combines two conditions, and returns TRUE when either of the conditions is TRUE.

SQL EXISTS Operator for Beginners

September 17, 2024November 30, 2020 by Ian

In SQL, the EXISTS operator specifies a subquery to test for the existence of rows. It returns TRUE when the subquery returns one or more rows.

A subquery is a query that is nested inside another query (or even another subquery)

This article contains some basic examples of the EXISTS operator.

SQL IN Operator for Beginners

September 17, 2024November 30, 2020 by Ian

In SQL, the IN operator allows you to filter your query results based a list of values.

You can also use it to match any value returned by a subquery (a subquery is a query that’s nested inside another query).

SQL LIKE Operator for Beginners

April 13, 2021November 29, 2020 by Ian

In SQL, the LIKE operator allows you to do pattern matching. It determines whether a specific character string matches a specified pattern.

A pattern can include regular characters and wildcard characters.

But you can also insert the results of a query into a table. This means that you can insert multiple rows at once (as long as they’re returned by the query).