



Xác định thực thể Cơ sở dữ liệu quan hệ
In Stock
$34.99
$29.99
Shipping and Returns Policy
- Deliver to United States » Shipping Policy «
- - Shipping Cost: $5.99
- - Handling time: 2-3 business days
- - Transit time: 7-10 business days
- Eligible for » Returns & Refund Policy « within 30 days from the date of delivery
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ví dụ về cơ sở dữ liệu quan hệ
- Sắp xếp theo thứ tự giảm dần (DESC) Lệnh SELECT
- AND (và) - Cả hai điều kiện phải đúng Mệnh đề WHERE
- Mệnh đề ON
- Mệnh đề HAVING
- Sửa đổi dữ liệu hiện có trong một bảng Lệnh UPDATE
- Chỉ định tên cột để sắp xếp Mệnh đề ORDER BY
- Xóa một sinh viên cụ thể dựa trên mã sinh viên Lệnh DELETE
- Tính toàn vẹn tham chiếu (Referential Integrity) Khóa chính và khóa ngoại
- Khóa chính
- Ví dụ về câu lệnh DML (UPDATE) Các loại câu lệnh SQL
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Next Day Delivery by USPS
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Order by 9pm (excludes Public holidays)
$11.99
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Express Delivery - 48 Hours
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Order by 9pm (excludes Public holidays)
$9.99
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Standard Delivery $6.99 Find out more
Delivered within 3 - 7 days (excludes Public holidays).
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Store Delivery $6.99 Find out more
Delivered to your chosen store within 3-7 days
Spend over $400 (excluding delivery charge) to get a $20 voucher to spend in-store -
International Delivery Find out more
International Delivery is available for this product. The cost and delivery time depend on the country.
You can now return your online order in a few easy steps. Select your preferred tracked returns service. We have print at home, paperless and collection options available.
You have 28 days to return your order from the date it’s delivered. Exclusions apply.
View our full Returns and Exchanges information.
Our extended Christmas returns policy runs from 28th October until 5th January 2025, all items purchased online during this time can be returned for a full refund.
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