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How to correctly use WITH ROLLUP in MySQL?
The syntax is as follows to use WITH ROLLUP −
select yourColumnName1,sum(yourColumnName2) from yourTableName group by yourColumnName1 with rollup;
Let us first create a table −
mysql> create table DemoTable1622 -> ( -> EmployeeCountryName varchar(20), -> EmployeeSalary int -> ); Query OK, 0 rows affected (0.44 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable1622 values('US',4500);
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable1622 values('UK',1500);
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable1622 values('AUS',1700);
Query OK, 1 row affected (0.19 sec)
mysql> insert into DemoTable1622 values('UK',1900);
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable1622 values('US',3900);
Query OK, 1 row affected (0.42 sec)Display all records from the table using select statement −
mysql> select * from DemoTable1622;
This will produce the following output −
+---------------------+----------------+ | EmployeeCountryName | EmployeeSalary | +---------------------+----------------+ | US | 4500 | | UK | 1500 | | AUS | 1700 | | UK | 1900 | | US | 3900 | +---------------------+----------------+ 5 rows in set (0.00 sec)
Here is the query to correctly use WITH ROLLUP in MySQL −
mysql> select EmployeeCountryName,sum(EmployeeSalary) from DemoTable1622 -> group by EmployeeCountryName with rollup;
This will produce the following output −
+---------------------+---------------------+ | EmployeeCountryName | sum(EmployeeSalary) | +---------------------+---------------------+ | AUS | 1700 | | UK | 3400 | | US | 8400 | | NULL | 13500 | +---------------------+---------------------+ 4 rows in set (0.02 sec)
Updated on: 08-Nov-2019
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