Sql 2 way of select unique

/** Find the higher id values of duplicates, distinct only added for clarity */
    SELECT  distinct d2.id
    FROM    dupes d1
        INNER JOIN dupes d2 ON d2.word=d1.word AND d2.num=d1.num
    WHERE d2.id > d1.id

/*
id|
--|
 5|
 6|
 8|
 9|
10|
*/

/** Use the previous query in a subquery to exclude the dupliates with higher id values */
SELECT  *
FROM    dupes
WHERE   id NOT IN (
    SELECT  d2.id
    FROM    dupes d1
        INNER JOIN dupes d2 ON d2.word=d1.word AND d2.num=d1.num
    WHERE d2.id > d1.id
)
ORDER BY word, num;

/*
word|num|id|
----|---|--|
aaa |100| 1|
bbb |200| 2|
bbb |400| 4|
ccc |300| 3|
ddd |400| 7|
*/

Source: stackoverflow.com

Sql 2 way of select unique

WITH CTE AS (
    SELECT  *
           ,row_number() OVER(PARTITION BY word, num ORDER BY id) AS row_num
    FROM    dupes
)
SELECT  word, num, id 
FROM    cte
WHERE   row_num = 1
ORDER BY word, num;

/*
word|num|id|
----|---|--|
aaa |100| 1|
bbb |200| 2|
bbb |400| 4|
ccc |300| 3|
ddd |400| 7|
*/

Source: stackoverflow.com

Similar codes

15 votes209 views3 answers
Mysql update add to existing value
SQL
3 votes288 views2 answers
How to list columns for particular tables in postgresql
SQL
0 vote214 views1 answer
Mysql custom sort order
SQL
0 vote241 views1 answer
SQL Query to delete all the tables in a database
SQL
2 votes182 views2 answers
How to create an empty table from an existing table
SQL
0 vote250 views1 answer
Selecting from a view SQL
SQL
7 votes320 views2 answers
Drop index oracle
SQL
0 vote245 views1 answer
Joomla execute raw sql
SQL
1 vote226 views3 answers
Postgresql get difference between two dates
SQL
0 vote218 views1 answer
How to get nth number in sql
SQL