Last updated: November 08, 2026
This Privacy Policy explains how Practice Window Functions ("we," "us," or "our") handles information when you visit practicewindowfunctions.com (the "Site"), use its SQL practice features, contact us, subscribe to email updates, request a downloadable resource, or purchase a digital product.
We use information to:
The Site uses an essential session cookie for core operation and rate limiting. Blocking essential cookies may prevent parts of the Site from working correctly.
Google Analytics uses cookies and similar technologies to help us understand Site usage. You can learn more about how Google uses information from sites that use its services in Google's explanation for partner sites and review Google's Privacy Policy.
Google and its advertising partners may use cookies and similar technologies for advertising. You can learn more in Google's explanation for partner sites and review Google's Privacy Policy.
Links in emails may include parameters that help us understand which message brought a visitor to the Site. Analytics or advertising technologies on the destination page remain subject to the privacy and consent controls that apply on the Site.
We may disclose information to:
For a privacy request, including a request to opt out of sale or sharing where applicable, please contact us.
If you submit an email signup form, you ask us to send the types of occasional updates described on that form. These may include new SQL practice problems, learning resources, Site features, and product information. We do not promise a fixed sending schedule.
When a downloadable resource is offered in connection with an email signup, we use the information you provide to deliver or provide access to that resource and, when the form clearly says so, to send the described email updates. You can withdraw your consent at any time by using the unsubscribe link in an email or by contacting us. Withdrawing consent does not affect processing that occurred before you withdrew it.
Purchasing a product does not by itself subscribe you to marketing emails. We will use a purchase email address for order-related purposes such as receipts, delivery, support, refunds, fraud prevention, and required notices. We will send marketing emails to a purchaser only if that person separately opts in.
Dodo Payments acts as the merchant of record for digital-product purchases and handles customer and payment information, payment processing, applicable taxes, receipts, refunds, digital delivery, and related transaction functions. Dodo acts as an independent controller of the personal information it processes for those services. Its handling of that information is governed by Dodo Payments' Privacy Policy.
Where applicable law requires a legal basis, we process personal information as necessary to provide requested Site features or fulfill a purchase, comply with legal obligations, pursue legitimate interests such as operating and securing the Site, or based on consent when consent is requested. We rely on consent to send the optional email updates described above. You may withdraw consent through an email's unsubscribe link or the available privacy controls, but withdrawal does not affect processing that occurred before consent was withdrawn.
We retain information only for as long as reasonably necessary for the purposes described in this policy, including providing the Site, responding to messages, maintaining business and transaction records, resolving disputes, enforcing agreements, meeting legal obligations, and protecting the Site. Retention periods vary by the type of information and why it is processed. Service providers may retain information under their own policies and legal obligations.
We generally retain active subscriber information while you remain subscribed and as needed to administer the email program. If you unsubscribe, we or MailerLite may retain limited information on a suppression list so that we can honor your opt-out and meet legal or compliance obligations.
We use reasonable administrative, technical, and organizational safeguards designed to protect personal information. No website, transmission, or storage system can be guaranteed to be completely secure.
Depending on where you live, you may have rights to request access to, correction of, or deletion of personal information; obtain a copy of certain information; object to or restrict certain processing; withdraw consent; or opt out of certain sales, sharing, targeted advertising, or profiling. You may also have the right not to receive discriminatory treatment for exercising a privacy right.
You can stop receiving optional email updates at any time by using the unsubscribe link in any such email. You may also contact us about your subscription or email-related personal information.
To submit a request concerning information controlled by Practice Window Functions, please contact us. We may need to verify your identity before completing a request, and applicable law may permit or require us to deny or limit some requests.
For information about Google's advertising practices and privacy choices, review Google's Privacy Policy. You may also contact us with a privacy request.
The Site is intended for a general audience and is not directed to children under 13. We do not knowingly collect personal information from children under 13. If you believe a child has provided personal information through the Site, please contact us.
Practice Window Functions is operated from the United States. We and our service providers may process information in the United States and other countries, where privacy laws may differ from those in your location. Where required, providers use safeguards intended to protect information transferred across borders.
The Site may link to websites and services operated by others. Their privacy practices are governed by their own policies, and this Privacy Policy does not apply to those third-party sites or services.
We may update this Privacy Policy to reflect changes to the Site, our practices, or legal requirements. When we do, we will revise the "Last updated" date at the top of this page.
If you have questions about this policy or want to submit a privacy request concerning Practice Window Functions, please contact us.