Posts by ijtaba

Summary: in this tutorial, you will learn how to use the SQL NOT operator to negate a Boolean expression. Introduction to the SQL NOT operator  The NOT operator allows you to negate a condition. It returns the opposite of the condition’s result: NOT conditionCode language: SQL (Structured Query Language) (sql) If the condition is true, the NOT operator makes…

Summary: in this tutorial, you learn about the NULL and how to use the SQL  IS NULL operator to test if a value is NULL or not. Introduction to NULL in databases  In the database world, NULL is a marker that indicates unknown or missing data in the database. For example, if you don’t know the phone numbers…

Summary: in this tutorial, you will learn how to use the SQL LIKE operator to test whether a value matches a pattern. Introduction to SQL LIKE operator  The LIKE operator is one of the SQL logical operators. The LIKE operator returns true if a value matches a pattern or false otherwise. Here’s the syntax of the LIKE operator: expression LIKE patternCode language: SQL…

Summary: in this tutorial, you will learn how to use the SQL IN operator to check if a value is in a set of values. Introduction to SQL IN Operator  The IN is one of the logical operators in SQL. The IN operator returns true if a value is in a set of values or false otherwise. Here’s the syntax of the IN operator:…

Summary: in this tutorial, you’ll learn how to use the SQL BETWEEN operator to check if a value falls within a specific range. Introduction to SQL BETWEEN operator  The BETWEEN operator is one of the logical operators in SQL. The BETWEEN operator checks if a value is within a range of values. Here’s the syntax of the BETWEEN operator:…

Summary: in this tutorial, you will learn how to use the SQL OR operator to combine two Boolean expressions. Introduction to SQL OR operator  The OR is a logical operator that combines two Boolean expressions. The OR operator returns false if and only if both expressions are false. The OR operator is typically used in the WHERE clause of the SELECT, UPDATE, or DELETE statement to form a flexible…

Summary: This tutorial introduces you to the SQL AND operator and shows you how to apply it to form flexible conditions in the WHERE clause of a query. Introduction to SQL AND operator  The AND operator is a logical operator that combines two Boolean expressions in the WHERE clause of the SELECT, UPDATE, or DELETE statement. Here’s the syntax of the AND operator: expression1 AND expression2;…

Summary: in this tutorial, you will learn how to use the SQL WHERE clause to filter rows based on one or more conditions. Introduction to SQL WHERE clause  To select specific rows from a table based on one or more conditions, you use the WHERE clause in the SELECT statement. Here’s the syntax of the WHERE clause: SELECT…

Summary: in this tutorial, you will learn how to use the SQL FETCH clause to limit the number of rows returned by a query. Introduction to SQL FETCH clause To limit the number of rows returned by a query, you use the LIMIT clause. The LIMIT clause is widely supported by many database systems such as…