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The CHECK constraint is an important integrity constraint in a Database Management System (DBMS) that is used to restrict the values that can be stored in a table. It ensures that data entered into a database satisfies a specified condition or rule. A database may contain large amounts of information, and without appropriate restrictions, users may accidentally enter invalid, unreasonable, or inconsistent values. The CHECK constraint helps maintain data accuracy, consistency, and reliability by allowing only those values that satisfy a predefined condition. In a relational database, a table consists of rows and columns. Each column may have certain requirements regarding the type and range of data that it can contain. While a data type specifies the general form of data, such as INTEGER, VARCHAR, DATE, or DECIMAL, it does not always specify whether a particular value is logically acceptable. For example, an INTEGER column used for storing the age of employees may accept negative numbers even though a negative age is not meaningful. Similarly, a salary column may accept a value of zero or a negative amount unless an appropriate restriction is applied. The CHECK constraint can be used to prevent such invalid values. The basic syntax for defining a CHECK constraint is: ```sql CREATE TABLE table_name ( column1 datatype, column2 datatype CHECK (condition), column3 datatype ); ``` ______ _________ ______ _____ _______ __________ _____ _______ _____.
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