Sql unique select

Sql unique rows

SELECT
DISTINCT country
FROM City;

Source: learnsql.com

Sql insert for each distinct value

insert into your_table (col1, col2, col3)
select distinct col1, 'newval', col3
from your_table

Source: stackoverflow.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 vote258 views1 answer
Convert int to varchar sql
SQL
0 vote263 views1 answer
Oracle free up space in tablespace
SQL
1 vote264 views1 answer
Sql padd let with zeros
SQL
2 votes267 views4 answers
2nd highest salary in mysql
SQL
0 vote266 views1 answer
How to close external sql connection in laravel
SQL
1 vote267 views1 answer
Increasing font and zooming in mysql workbench
SQL
1 vote240 views2 answers
Into sql
SQL
44 votes362 views4 answers
Mysql alter table add column first
SQL
0 vote275 views2 answers
Add new column after in sql
SQL
0 vote268 views1 answer
Alter owner in PostgreSQL
SQL