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sql unique select

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Kevin answered on January 7, 2021 Popularity 10/10 Helpfulness 3/10

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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 rows

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SELECT
DISTINCT country
FROM City;

Popularity 10/10 Helpfulness 6/10 Language sql

Source: learnsql.com

Tags: rows

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Contributed on Feb 07 2022

Strange Sable

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how to select unique element in sql

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DISTINCT
- select distinct * from employees; ==> 
  retrieves any row if it has at
  least a single unique column.

- select distinct first_name from employees; ==> 
      retrieves unique names
     from table. (removes duplicates)
     
- select distinct count(*) from employees;
     retrieve number of unique rows
     if any row has at least a single unique data.

Popularity 10/10 Helpfulness 5/10 Language sql

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Tags: element

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Contributed on Jan 28 2021

Obedient Ocelot

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unique element in sql

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DISTINCT
- select distinct * from employees; ==> retrieves any row if it has at
least a single unique column.
- select distinct first_name from employees; ==> retrieves unique names
from table. (removes duplicates)
- select distinct count(*) from employees; retrieve number of unique rows
if any row has at least a single unique data.

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Tags: element

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Contributed on Jan 28 2021

Obedient Ocelot

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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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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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Source: www.techonthenet.com

Tags: sql

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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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Tags: sql

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Contributed on Nov 19 2021

Kalineo

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sql unique select

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