The CHECK constraint is used to limit the value range that can be placed in a column. If you define a CHECK constraint on a column it will allow only certain values for this column. If you define a CHECK constraint on a table it can limit the values in certain columns based on values in other columns in the row.

2024年12月16日 · The SQL CHECK constraint is a valuable tool for maintaining data integrity by ensuring that only valid data is entered into the database. It allows you to enforce specific conditions on columns, ensuring that the data complies with business rules or data standards.

2024年4月23日 · Learn how to can create a check constraint in a table to specify the data values that are acceptable in one or more columns in the SQL Server Database Engine.

In SQL, a check constraint ensures data in one or more columns within a table meet a specific condition. The CHECK constraints help you maintain data accuracy by limiting the value columns can store.

2021年10月15日 · What is the SQL check constraint. The check constraints are the rule or set of rules that help to check the inserted (or updated) data values to tables based on a certain condition. So that, we can validate the newly inserted data values based on a specified rule before accepting them to the table. The main advantage of check constraints is ...

The CHECK constraint in SQL is used to specify the condition that must be satisfied in order to insert data into a table. In this tutorial, you will learn about the CHECK constraint in SQL with the help of examples.

Summary: in this tutorial, you will learn how to use the SQL Server CHECK constraint to enforce domain integrity. The CHECK constraint allows you to specify the values in a column that must satisfy a Boolean expression. For example, to require positive unit prices, you can use: CREATE TABLE test.products( product_id INT IDENTITY PRIMARY KEY,