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What is ROW_NUMBER() in MySQL?
Row_NUMBER() included from MySQL version 8.0. It is a type of window function. This can be used to assign a sequence number for rows. To understand, create a table with the help of CREATE pcommand −
Creating a table
mysql> CREATE table rowNumberDemo -> ( -> FirstName varchar(100) -> ); Query OK, 0 rows affected (0.92 sec)
Inserting records
mysql> INSERT into rowNumberDemo values('john');
Query OK, 1 row affected (0.17 sec)
mysql> INSERT into rowNumberDemo values('john');
Query OK, 1 row affected (0.29 sec)
mysql> INSERT into rowNumberDemo values('Bob');
Query OK, 1 row affected (0.13 sec)
mysql> INSERT into rowNumberDemo values('Smith');
Query OK, 1 row affected (0.17 sec)We can display all the records with the help of SELECT statement −
mysql> SELECT * from rowNumberDemo;
The following is the output −
+-----------+ | FirstName | +-----------+ | john | | john | | Bob | | Smith | +-----------+ 4 rows in set (0.00 sec)
Now, we can use the row_number() to assign a incrementing value for every record −
mysql> SELECT row_number() over ( order by firstName) RowNumberSqeuence,FirstName from rowNumberDemo -> order by FirstName;
The following is the output −
+-------------------+-----------+ | RowNumberSqeuence | FirstName | +-------------------+-----------+ | 1 | Bob | | 2 | john | | 3 | john | | 4 | Smith | +-------------------+-----------+ 4 rows in set (0.00 sec)
Look at the output, we have assigned a number to every record with the help of row_number().
Updated on: 25-Jun-2020
2K+ Views
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