The WHERE clause can be combined with AND, OR, and NOT operators to create more precise conditions for fetching data from a database by combining multiple conditions.
⇒ AND and OR Operators: These operators are used to filter records based on more than one condition.
⇒ AND Operator: Displays a record if all the conditions separated by AND are TRUE.
⇒ OR Operator: Displays a record if any of the conditions separated by OR is TRUE.
⇒ NOT Operator: Displays a record if the condition(s) is NOT TRUE. NOT reverses the meaning of any operator with which it is used. This is a negate operator (e.g., NOT IN, NOT BETWEEN, NOT EXISTS, IS NOT NULL, etc.).
The AND operator (or AND condition) is used to combine multiple conditions with the WHERE clause in SELECT, UPDATE, or DELETE statements. All conditions must be satisfied for a record to be selected.
The OR operator (or OR condition) is used to combine multiple conditions with the WHERE clause in SELECT, UPDATE, or DELETE statements. Any one of the conditions must be satisfied for a record to be selected.
The NOT operator (or NOT condition) is used to negate conditions with the WHERE clause in SELECT, UPDATE, or DELETE statements. It displays a record if the condition(s) is NOT TRUE. NOT reverses the meaning of any operator with which it is used (e.g., NOT IN, NOT BETWEEN, NOT EXISTS, IS NOT NULL, etc.).
Example: Combining AND and OR Conditions
The SQL AND condition and OR condition can be combined to test for multiple conditions with the WHERE clause in SELECT, UPDATE, or DELETE statements.
⇒ When combining these conditions, it is important to use parentheses ().
⇒ The parentheses determine the order that the AND and OR conditions are evaluated.
⇒ Precedence order: NOT, AND, OR.
By correcting spelling mistakes, grammar mistakes, and conceptual errors, this version provides a clear and accurate explanation of the SQL AND, OR, and NOT operators and their usage.
