Getting Values and Subtotals in One Go with COALESCE : Group By « Query Select « Oracle PL/SQL Tutorial

SQL>
SQL> CREATE TABLE product
  2  (item         VARCHAR(10)
  3  ,serialNumber INT
  4  ,price        INT
  5  );

Table created.

SQL> INSERT INTO product VALUES ('AAA', 1,10);

1 row created.

SQL> INSERT INTO product VALUES ('BBB',2,10);

1 row created.

SQL> INSERT INTO product VALUES ('AAA', 3,10);

1 row created.

SQL> INSERT INTO product VALUES ('CCC',4,10);

1 row created.

SQL> INSERT INTO product VALUES ('BBB',5,10);

1 row created.

SQL> INSERT INTO product VALUES ('BBB',6,10);

1 row created.

SQL>
SQL> SELECT item, serialNumber, price FROM(
  2    SELECT item, serialNumber, price FROM product
  3    UNION
  4    SELECT item, NULL,         SUM(price)
  5      FROM product
  6     GROUP BY item
  7  ) t
  8  ORDER BY item, COALESCE(serialNumber,1E9);

ITEM       SERIALNUMBER      PRICE
---------- ------------ ----------
AAA                   1         10
AAA                   3         10
AAA                             20
BBB                   2         10
BBB                   5         10
BBB                   6         10
BBB                             30
CCC                   4         10
CCC                             10

9 rows selected.

SQL>
SQL> DROP TABLE product;

Table dropped.

SQL>

2.5.Group By
	2.5.1.	Using Multiple Columns in a Group
	2.5.2.	GROUP by with NULL value
	2.5.3.	Use the aggregate functions with the GROUP BY clause
	2.5.4.	By default, GROUP BY sorts the rows in ascending order
	2.5.5.	Using the ORDER BY Clause to Sort Groups
	2.5.6.	You don't have to include the columns used in the GROUP BY clause in your SELECT clause
	2.5.7.	GROUP BY used on a column without the column name appearing in the result set
	2.5.8.	Any row-level variable (i.e., a column name) in the result set must be mentioned in the GROUP BY clause for the query to make sense.
	2.5.9.	Grouping at Multiple Levels
	2.5.10.	ORA-00979: not a GROUP BY expression
	2.5.11.	Getting Values and Subtotals in One Go
	2.5.12.	Getting Values and Subtotals in One Go with COALESCE
	2.5.13.	Getting Values and Subtotals in One Go with UNION
	2.5.14.	Group all ids with averager value more than
	2.5.15.	Group and count employeem and display only if its count is more than 4
	2.5.16.	Count employee, group by department id and job title
	2.5.17.	Count and group by department id
	2.5.18.	Count distinct with group by
	2.5.19.	Born after '1960-01-01', group by department number with count(*) >= 4;
	2.5.20.	Group by case