Unique in sql server

Sql unique rows

SELECT
DISTINCT country
FROM City;

Source: learnsql.com

Unique in sql server

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

How to select unique element in sql

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.

Unique element in sql

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.

Sql unique select

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

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

Similar codes

0 vote337 views1 answer
How to know if table in rigt or left in sql
SQL
1 vote352 views1 answer
Mysql previous year
SQL
1 vote313 views2 answers
Postgresql list columns
SQL
17 votes326 views6 answers
Get last record in sql
SQL
0 vote309 views1 answer
SHOW RESULT WITHOUT ROUND IN SQL
SQL
5 votes324 views1 answer
How to check nls format in oracle
SQL
1 vote326 views1 answer
Get the User Name and Domain Name from an Email Address
SQL
0 vote331 views2 answers
Raise notice in postgresql function
SQL
0 vote371 views1 answer
Drop a view in sqlite
SQL
3 votes313 views3 answers
Mysqldump: couldn
SQL