SQLite Group By

Syntax

Below is the basic syntax of the GROUP BY clause. The GROUP BY clause must be placed after the conditions in the WHERE clause and before the ORDER BY clause.

SELECT column-list
FROM table_name
WHERE [ conditions ]
GROUP BY column1, column2....columnN
ORDER BY column1, column2....columnN

You can use multiple columns in the GROUP BY clause. Make sure that the grouping columns you use are in the column list.

Example

Assume the COMPANY table has the following records:

ID          NAME        AGE         ADDRESS     SALARY
----------  ----------  ----------  ----------  ----------
1           Paul        32          California  20000.0
2           Allen       25          Texas       15000.0
3           Teddy       23          Norway      20000.0
4           Mark        25          Rich-Mond   65000.0
5           David       27          Texas       85000.0
6           Kim         22          South-Hall  45000.0
7           James       24          Houston     10000.0

If you want to know the total salary of each customer, you can use a GROUP BY query as follows:

sqlite> SELECT NAME, SUM(SALARY) FROM COMPANY GROUP BY NAME;

This will produce the following result:

NAME        SUM(SALARY)
----------  -----------
Allen       15000.0
David       85000.0
James       10000.0
Kim         45000.0
Mark        65000.0
Paul        20000.0
Teddy       20000.0

Now, let us use the following INSERT statement to create three more records in the COMPANY table:

INSERT INTO COMPANY VALUES (8, 'Paul', 24, 'Houston', 20000.00 );
INSERT INTO COMPANY VALUES (9, 'James', 44, 'Norway', 5000.00 );
INSERT INTO COMPANY VALUES (10, 'James', 45, 'Texas', 5000.00 );

Now, our table has records with duplicate names, as shown below:

ID          NAME        AGE         ADDRESS     SALARY
----------  ----------  ----------  ----------  ----------
1           Paul        32          California  20000.0
2           Allen       25          Texas       15000.0
3           Teddy       23          Norway      20000.0
4           Mark        25          Rich-Mond   65000.0
5           David       27          Texas       85000.0
6           Kim         22          South-Hall  45000.0
7           James       24          Houston     10000.0
8           Paul        24          Houston     20000.0
9           James       44          Norway      5000.0
10          James       45          Texas       5000.0

Let us use the same GROUP BY statement to group all records by the NAME column, as shown below:

sqlite> SELECT NAME, SUM(SALARY) FROM COMPANY GROUP BY NAME ORDER BY NAME;

This will produce the following result:

NAME        SUM(SALARY)
----------  -----------
Allen       15000
David       85000
James       20000
Kim         45000
Mark        65000
Paul        40000
Teddy       20000

Let us use the ORDER BY clause together with the GROUP BY clause, as shown below:

sqlite>  SELECT NAME, SUM(SALARY) 
         FROM COMPANY GROUP BY NAME ORDER BY NAME DESC;

This will produce the following result:

NAME        SUM(SALARY)
----------  -----------
Teddy       20000
Paul        40000
Mark        65000
Kim         45000
James       20000
David       85000
Allen       15000