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 vote240 views1 answer
How to get parent and child record in single query using sql
SQL
1 vote241 views1 answer
Convert epoch to date in sql server
SQL
0 vote245 views1 answer
Sql sum if
SQL
0 vote213 views1 answer
Select password from user mysql
SQL
3 votes204 views1 answer
Mysql CURRENT_TIMESTAMP()
SQL
1 vote233 views2 answers
Mysql filter by date mount
SQL
21 votes235 views6 answers
Change column in mysql
SQL
14 votes223 views2 answers
Sql cast
SQL
0 vote268 views1 answer
Psql create usr
SQL
1 vote193 views1 answer
Database run
SQL