本文為英文版的機器翻譯版本，如內容有任何歧義或不一致之處，概以英文版為準。

# 數學運算子符號
<a name="OPERATOR_SYMBOLS"></a>

 下表列出支援的數學運算子。

## 支援的運算子
<a name="OPERATOR_SYMBOLS-supported-operators"></a>

[\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/zh_tw/clean-rooms/latest/sql-reference/OPERATOR_SYMBOLS.html)

## 範例
<a name="OPERATOR_SYMBOLS-examples"></a>

計算已支付的佣金加上指定交易的 2.00 美元處理費：

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

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

針對給定交易計算售價的 20%：

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

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

根據持續成長模式的預測門票銷售。在此範例中，子查詢傳回 2008 年銷售的門票數。該結果在 10 年間以指數方式乘以 5% 的持續成長率。

```
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)
```

尋找日期 ID 大於或等於 2，000 之銷售的已支付總價和佣金。然後從支付總價中減去佣金總計。

```
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)
```