Mathematical operator symbols

The following table lists the supported mathematical operators.

Supported operators

Operator	Description	Example	Result
+	addition	2 + 3	5
-	subtraction	2 - 3	-1
*	multiplication	2 * 3	6
/	division	4 / 2	2
%	modulo	5 % 4	1
^	exponentiation	2.0 ^ 3.0	8
|/	square root	| / 25.0	5
||/	cube root	|| / 27.0	3
@	absolute value	@ -5.0	5

Examples

Calculate the commission paid plus a $2.00 handling fee for a given transaction:

select commission, (commission + 2.00) as comm
from sales where salesid=10000;

commission | comm
-----------+-------
28.05      | 30.05
(1 row)

Calculate 20 percent of the sales price for a given transaction:

select pricepaid, (pricepaid * .20) as twentypct
from sales where salesid=10000;

pricepaid | twentypct
----------+-----------
187.00    |    37.400
(1 row)

Forecast ticket sales based on a continuous growth pattern. In this example, the subquery returns the number of tickets sold in 2008. That result is multiplied exponentially by a continuous growth rate of 5 percent over 10 years.

select (select sum(qtysold) from sales, date
where sales.dateid=date.dateid and year=2008)
^ ((5::float/100)*10) as qty10years;

qty10years
------------------
587.664019657491
(1 row)

Find the total price paid and commission for sales with a date ID that is greater than or equal to 2,000. Then subtract the total commission from the total price paid.

select sum (pricepaid) as sum_price, dateid,
sum (commission) as sum_comm, (sum (pricepaid) - sum (commission)) as value
from sales where dateid >= 2000
group by dateid order by dateid limit 10;

 sum_price | dateid | sum_comm |   value
-----------+--------+----------+-----------
 364445.00 |   2044 | 54666.75 | 309778.25
 349344.00 |   2112 | 52401.60 | 296942.40
 343756.00 |   2124 | 51563.40 | 292192.60
 378595.00 |   2116 | 56789.25 | 321805.75
 328725.00 |   2080 | 49308.75 | 279416.25
 349554.00 |   2028 | 52433.10 | 297120.90
 249207.00 |   2164 | 37381.05 | 211825.95
 285202.00 |   2064 | 42780.30 | 242421.70
 320945.00 |   2012 | 48141.75 | 272803.25
 321096.00 |   2016 | 48164.40 | 272931.60
(10 rows)