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 vote174 views2 answers
Script all indexes in a database
SQL
0 vote169 views1 answer
Get last three characters in mysql column
SQL
2 votes192 views1 answer
Install postgresql centos 5
SQL
8 votes183 views1 answer
Oracle search stored procedures for text
SQL
7 votes181 views3 answers
Select latest entry in sql table
SQL
4 votes163 views1 answer
Datepart postgres
SQL
3 votes182 views1 answer
Postgres select max value
SQL
0 vote213 views1 answer
Kimball data warehouse sql calendar
SQL
34 votes223 views6 answers
Alter table add foreign key mysql
SQL
0 vote169 views1 answer
Select from column mysql
SQL