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sql unique

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Lorenzo Satta Chiris answered on January 7, 2021 Popularity 10/10 Helpfulness 3/10

answer sql unique

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sql unique

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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);

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Contributed on Jan 07 2021

Lorenzo Satta Chiris

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sql unique select

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SELECT DISTINCT col1, col2, ....
FROM table_name;

SELECT col1, MIN(col2)
FROM table_name
GROUP BY col1;

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Contributed on Nov 02 2021

Kevin

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SQL UNIQUE Constraint

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CREATE TABLE Colleges (
  college_id INT NOT NULL UNIQUE,
  college_code VARCHAR(20) UNIQUE,
  college_name VARCHAR(50)
);

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Contributed on May 22 2022

SAMER SAEID

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unique sql

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CREATE TABLE order_details
( order_detail_id integer CONSTRAINT order_details_pk PRIMARY KEY,
  order_id integer NOT NULL,
  order_date date,
  quantity integer,
  notes varchar(200),
  CONSTRAINT order_unique UNIQUE (order_id)
);

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Contributed on Jul 04 2022

Goutam De

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unique in sql server

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CREATE TABLE Persons (
    ID int NOT NULL UNIQUE,
    LastName varchar(255) NOT NULL,
    FirstName varchar(255),
    Age int
);

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Contributed on Nov 19 2021

Kalineo

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sql unique

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