1.24. SQLite Group By

SQLite’s GROUP BY Clause is used with SELECT Statement to group the same data.

In SELECT Statement, the GROUP BY clause is placed in the WHERE After the clause, put in ORDER BY Before the clause.

1.24.1. Grammar ¶

The following is given GROUP BY The basic grammar of the clause. GROUP BY Clause must be placed in the WHERE Clause, you must put it in the ORDER BY Before the clause.

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

You can find it in the GROUP BY Multiple columns are used in the clause. Make sure that the grouping you use is listed in the list.

1.24.2. Example ¶

Hypothetical COMPANY The 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 the GROUP BY Query, as follows:

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

This will produce 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 in COMPANY Create three additional records in the 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 ); 

Our table now has a record with duplicate names, 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’s use the same. GROUP BY Statement to press on all records NAME Columns are grouped as follows:

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

This will produce the following results:

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

Let’s put ORDER BY Clause vs. GROUP BY Clause is used together, as follows

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

This will produce the following results:

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