Answers for "unique key in sql server"

SQL
1

unique in sql server

CREATE TABLE Persons (
    ID int NOT NULL UNIQUE,
    LastName varchar(255) NOT NULL,
    FirstName varchar(255),
    Age int
);
Posted by: Guest on November-19-2021
0

unique key in ms sql server

/* To create the Unique Key.
Unique Key constraint to enforce uniqueneess of a column i.e. the column 
shouldn't allow duplicate values.*/
ALTER TABLE Table_Name
ADD CONSTRAINT Constraint_Name UNIQUE (Column_Name)
Posted by: Guest on June-11-2021
0

unique key in sql

Unique Key:
Only unique value and also can contain NULL
Posted by: Guest on January-27-2021
-1

Unique Key in sql

CREATE TABLE Students ( 	 /* Create table with a single field as unique */
    ID INT NOT NULL UNIQUE
    Name VARCHAR(255)
);

CREATE TABLE Students ( 	 /* Create table with multiple fields as unique */
    ID INT NOT NULL
    LastName VARCHAR(255)
    FirstName VARCHAR(255) NOT NULL
    CONSTRAINT PK_Student
    UNIQUE (ID, FirstName)
);

ALTER TABLE Students 	 /* Set a column as unique */
ADD UNIQUE (ID);

ALTER TABLE Students 	 /* Set multiple columns as unique */
ADD CONSTRAINT PK_Student 	 /* Naming a unique constraint */
UNIQUE (ID, FirstName);
Posted by: Guest on July-06-2021

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