Membatasi data

Pengantar Oracle SQL

Sara Billen

Curriculum Manager

Menyaring baris

Filter

Operator perbandingan
Kata kunci perbandingan
Operator logika

WHERE

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

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

Operator perbandingan

Operator	Deskripsi
>	Lebih besar dari
>=	Lebih besar atau sama dengan
<	Lebih kecil dari
<=	Lebih kecil atau sama dengan
=	Sama dengan
<>	Tidak sama dengan

SELECT UnitPrice
FROM Track
WHERE UnitPrice <> 0.99

Kata kunci perbandingan

Fitur tambahan klausa WHERE

Kata kunci perbandingan - 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       |
| ...                              |

Kata kunci perbandingan - 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          |

Kata kunci perbandingan - LIKE

Pilih baris yang cocok dengan pola karakter menggunakan LIKE

Simbol	Deskripsi
`%`	Merepresentasikan urutan 0+ karakter
`_`	Merepresentasikan satu karakter apa pun

Kata kunci perbandingan - LIKE

SELECT LastName
FROM Employee
WHERE LastName LIKE '_a%'

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

Operator logika

Operator logika - 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  |

Operator logika - 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  |
| ...                                |

Operator logika - 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 |
| ...                                |

Ringkasan

WHERE: menyaring baris berdasarkan kondisi

Operator perbandingan: =, <, >, <=, >=, <>
Kata kunci perbandingan: BETWEEN, IN, LIKE
Operator logika: AND, OR, NOT

Ayo berlatih!

Pengantar Oracle SQL