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(SELECT O.ordernum
FROM sales.orders O
WHERE custnum IN
(SELECT custnum
FROM sales.customer
WHERE state = 'CALIFORNIA'))
GROUP BY OD.ordernum;
ORDERNUM
----------
200490
300350
300380
--- 3 row(s) selected.
The price for the total quantity ordered is computed for each order number.
•
Show employees, their salaries, and the percentage of the total payroll that their salaries
represent. Note the subquery as part of the expression in the select list:
SELECT empnum, first_name, last_name, salary,
CAST(salary * 100 / (SELECT SUM(salary) FROM persnl.employee)
AS NUMERIC(4,2))
FROM persnl.employee
ORDER BY salary, empnum;
Employee/Number
---------------
...
...
--- 62 row(s) selected.
•
Examples of using expressions in the GROUP BY clause:
SELECT a+1 FROM t GROUP BY a+1;
SELECT cast(a AS int) FROM t GROUP BY cast(a AS int);
SELECT a+1 FROM t GROUP BY 1;
•
Examples of unsupported expressions in the GROUP BY clause:
SELECT sum(a) FROM t GROUP BY sum(a);
SELECT (SELECT a FROM t1) FROM t GROUP BY (SELECT a FROM t1);
SELECT a+1 FROM t GROUP BY 1+a;
Examples for Embedded INSERT
•
Table identity_table is created with an identity column. As rows are inserted into
identity_table, the customer obtains the values of the identity column.
CREATE TABLE identity_table
(a LARGEINT GENERATED BY DEFAULT AS IDENTITY
NOT NULL,
b INT UNSIGNED NOT NULL,
c INT UNSIGNED,
primary key(a));
•
Inserts new rows into the identity_table table and retrieves IDENTITY column values
using the SELECT statement syntax.
select a
(EXPR)
---------------------
1030.00
71025.00
28560.00
First Name
---------------
209
SUSAN
235
MIRIAM
224
MARIA
23
JERRY
32
THOMAS
1
ROGER
Last Name
--------------------
CHAPMAN
KING
JOSEF
HOWARD
RUDLOFF
GREEN
salary
(EXPR)
-----------
-------
17000.00
.61
18000.00
.65
18000.10
.65
137000.10
4.94
138000.40
4.98
175500.00
6.33
SELECT Statement
161
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