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

5 votes276 views1 answer
How to check nls format in oracle
SQL
0 vote266 views1 answer
List MySQL Table and Index Size
SQL
0 vote303 views1 answer
.sql File Run in PSQL
SQL
0 vote287 views1 answer
Illuminate\Database\QueryException: SQLSTATE[42S22]: Column not found: 1054 Unknown column 'updated_at' in 'field list'
SQL
0 vote246 views1 answer
Mariadb list tables
SQL
2 votes283 views1 answer
Oracle run_duration average
SQL
9 votes293 views4 answers
How to alter table column name in mysql
SQL
19 votes280 views6 answers
What is mySQL
SQL
20 votes318 views4 answers
How to find average in sql
SQL
3 votes318 views6 answers
DB::table('users')->get();
SQL