SQL CHECK Constraint
The SQL CHECK CONSTRAINT ensures that a value for a specific column or columns have satisfied a specified condition. The job of CHECK constraint is, to limit the values for a column of a table.
SQL FOREIGN KEY
The SQL FOREIGN KEY CONSTRAINT is used to ensure the referential integrity of the data in one table to match values in another table. The FOREIGN KEY CONSTRAINT is a column or list of columns which ...
SQL PRIMARY KEY
The SQL PRIMARY KEY is a column in a table which must contain a unique value which can be used to identify each and every row of a table uniquely. However, SQL supports primary keys directly with th...
SQL UNIQUE Constraint
The SQL UNIQUE constraint is used to ensure that the each rows for a column have different value. In this page we are going to discuss, how the SQL UNIQUE CONSTRAINT works if it is used at the end of...
SQL Constraints
The SQL CONSTRAINTS are an integrity which defines some conditions that restricts the column to remain true while inserting or updating or deleting data in the column. Constraints can be specified wh...
