#sql server integrity constraints examples

[bigdatansql]

UNIQUE KEY in SQL Server

This article's goal is to add to "SQL Server All in One." The use of a unique constraint makes sure that no duplicate values are recorded in any given column that does not function as the primary key. A corresponding unique index is generated when a uniq

This article’s goal is to add to “SQL Server All in One.” The use of a unique constraint makes sure that no duplicate values are recorded in any given column that does not function as the primary key. A corresponding unique index is generated when a unique constraint is created. Though the PRIMARY KEY consists of UNIQUENESS and NOT NULL, only one PRIMARY KEY constraint is allowed for each table.…

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[bigdatansql]

SQL Server CHECK Constraint

In SQL Server, you may create a check constraint in a table to specify the data values that are permitted in one or more columns. This means, that when you define a CHECK constraint on a column, it restricts the values that can be assigned to that column.

In SQL Server, you may create a check constraint in a table to specify the data values that are permitted in one or more columns. This means, that when you define a CHECK constraint on a column, it restricts the values that can be assigned to that column. Some examples- CREATE TABLE Emp( EmpNo INT, EName VARCHAR(100), Job VARCHAR(100), Mgr INT, HireDate DATE, Sal INT, Comm INT, DeptNo INT, Sal…

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