SQLite Group By

grammar

The following shows the basic syntax GROUP BY clause. GROUP BY clause must be placed after the WHERE clause conditions, it must be placed 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 you use the grouping columns in the column list.

Examples

Suppose 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 wage bill of each customer, you can use the GROUP BY query as follows:

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

This produces the following results:

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's use the following INSERT statement to create another three 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 duplicate record name, as follows:

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 Press NAME columns as follows:

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

This produces the following results:

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

Let ORDER BY clause is used in conjunction with the GROUP BY clause, as follows:

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

This produces the following results:

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