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

0 vote137 views1 answer
Get cpu details sql
SQL
20 votes131 views3 answers
SQL query rename table
SQL
0 vote130 views1 answer
Watch mysql command line
SQL
0 vote125 views1 answer
How to select all fieldsin a soql query
SQL
0 vote167 views2 answers
Sql unique
SQL
5 votes124 views1 answer
Postgresql functions
SQL
1 vote118 views1 answer
Use of now() in mysql
SQL
0 vote153 views1 answer
Alter database name script
SQL
1 vote130 views3 answers
Mysql connection string
SQL
0 vote118 views1 answer
Fetch second word from a string in ms sql
SQL