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
----------  ----------  ----------  ----------  ----------
         Paul        32          California  20000.0
         Allen       25          Texas       15000.0
         Teddy       23          Norway      20000.0
         Mark        25          Rich-Mond   65000.0
         David       27          Texas       85000.0
         Kim         22          South-Hall  45000.0
         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
----------  ----------  ----------  ----------  ----------
         Paul        32          California  20000.0
         Allen       25          Texas       15000.0
         Teddy       23          Norway      20000.0
         Mark        25          Rich-Mond   65000.0
         David       27          Texas       85000.0
         Kim         22          South-Hall  45000.0
         James       24          Houston     10000.0
         Paul        24          Houston     20000.0
         James       44          Norway      5000.0
        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