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 vote181 views2 answers
How to save result of sqlite query in a table
SQL
0 vote188 views1 answer
How to query all tables mysql at the same time
SQL
0 vote172 views1 answer
Sql constarint
SQL
38 votes259 views6 answers
Ubuntu install mysql client
SQL
0 vote202 views1 answer
VERIFY INDEXES WITH PARTITIONS IN SQL ORACLE
SQL
2 votes173 views1 answer
Postgresql update sequence next value
SQL
0 vote186 views1 answer
Which sql statement would you use to remove a view called emp_dept_vu from your schema?
SQL
5 votes178 views2 answers
Copy data from one database to another
SQL
0 vote238 views1 answer
Ora 00001 error catch plsql
SQL
0 vote180 views1 answer
Mostrar datos de tablas relacionadas mysql kjava
SQL