how to add unique constraint in mysql table
ALTER TABLE mytbl ADD UNIQUE (columnName);how to add unique constraint in mysql table
ALTER TABLE mytbl ADD UNIQUE (columnName);mysql create unique key via alter table
ALTER TABLE Persons
ADD CONSTRAINT UC_Person UNIQUE (ID,LastName);how to add unique key constraint in mysql
-- Add a Unique constraint and deifine the constraint name
ALTER TABLE TABLENAME
ADD CONSTRAINT UQ_tblPerson_Email UNIQUE(COLUMN_NAME)sql unique
This constraint ensures all values in a column are unique.
Example 1 (MySQL): Adds a unique constraint to the id column when
creating a new users table.
CREATE TABLE users (
id int NOT NULL,
name varchar(255) NOT NULL,
UNIQUE (id)
);
Example 2 (MySQL): Alters an existing column to add a UNIQUE
constraint.
ALTER TABLE users
ADD UNIQUE (id);Copyright © 2021 Codeinu
Forgot your account's password or having trouble logging into your Account? Don't worry, we'll help you to get back your account. Enter your email address and we'll send you a recovery link to reset your password. If you are experiencing problems resetting your password contact us
