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 vote225 views1 answer
Truncate a table then insert data
SQL
0 vote241 views5 answers
Select concat alter table mysql
SQL
6 votes220 views4 answers
Sqlite drop table
SQL
11 votes230 views2 answers
Docker create postgres db
SQL
24 votes246 views5 answers
Import dump mysql
SQL
13 votes248 views2 answers
Sql online compiler
SQL
0 vote228 views1 answer
Android studio SQLiteDatabase delete all data in database
SQL
6 votes258 views2 answers
Mysql 1 day ago
SQL
0 vote229 views1 answer
How to find the most occuring in SQL
SQL
0 vote224 views1 answer
Oracle execute immediate quotes
SQL