データの絞り込み

Oracle SQL 入門

Sara Billen

Curriculum Manager

行のフィルタリング

フィルター

比較演算子
比較キーワード
論理演算子

WHERE

SELECT FirstName, LastName, Country 
FROM Customer
WHERE Country = 'Portugal'

| FirstName | LastName  | Country  |
|-----------|-----------|----------|
| João      | Fernandes | Portugal |
| Madalena  | Sampaio   | Portugal |

比較演算子

演算子	説明
>	より大きい
>=	以上
<	より小さい
<=	以下
=	等しい
<>	等しくない

SELECT UnitPrice
FROM Track
WHERE UnitPrice <> 0.99

比較キーワード

追加の WHERE 句の機能

比較キーワード - BETWEEN

SELECT Name, Milliseconds 
FROM Track
WHERE Milliseconds BETWEEN 100000 AND 200000

| Name              | Milliseconds |
|-------------------|--------------|
| Perfect           | 188133       |
| Right Through You | 176117       |
| We Die Young      | 152084       |
| Put You Down      | 196231       |
| ...                              |

比較キーワード - IN

SELECT EmployeeId, LastName, Title
FROM Employee
WHERE EmployeeId IN (4, 5, 6)

| EmployeeId | LastName | Title               |
|------------|----------|---------------------|
| 4          | Park     | Sales Support Agent |
| 5          | Johnson  | Sales Support Agent |
| 6          | Mitchell | IT Manager          |

比較キーワード - LIKE

LIKE で文字パターンに合う行を抽出

記号	説明
`%`	0 文字以上の任意の並びを表す
`_`	任意の 1 文字を表す

比較キーワード - LIKE

SELECT LastName
FROM Employee
WHERE LastName LIKE '_a%'

| LastName |
|----------|
| Park     |
| Callahan |

論理演算子

論理演算子 - AND

SELECT InvoiceId, BillingCountry, Total
FROM Invoice
WHERE BillingCountry = 'Australia' 
      AND Total > 4

| InvoiceId | BillingCountry | Total |
|-----------|----------------|-------|
| 66        | Australia      | 5.94  |
| 250       | Australia      | 13.86 |
| 305       | Australia      | 8.91  |

論理演算子 - OR

SELECT InvoiceId, BillingCountry, Total
FROM Invoice
WHERE BillingCountry = 'Australia' 
      OR Total > 4

| InvoiceId | BillingCountry | Total |
|-----------|----------------|-------|
| 3         | Belgium        | 5.94  |
| 4         | Canada         | 8.91  |
| 5         | USA            | 13.86 |
| 10        | Ireland        | 5.94  |
| ...                                |

論理演算子 - NOT

SELECT InvoiceId, BillingCountry, Total
FROM Invoice
WHERE BillingCountry NOT IN ('Australia', 'Canada', 'United Kingdom')

| InvoiceId | BillingCountry | Total |
|-----------|----------------|-------|
| 1         | Germany        | 1.98  |
| 2         | Norway         | 3.96  |
| 3         | Belgium        | 5.94  |
| 5         | USA            | 13.86 |
| ...                                |

まとめ

WHERE: 条件で行を絞り込む

比較演算子: =, <, >, <=, >=, <>
比較キーワード: BETWEEN, IN, LIKE
論理演算子: AND, OR, NOT

Let's practice!

Oracle SQL 入門