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SQL Fundamental exercises

Database setup

docker run -p 5432:5432 --name=intro-sql -e POSTGRES_PASSWORD=academy postgres:15

The aforementioned command will construct a database container with the name intro-sql.

To stop the database, run the following command:

docker stop intro-sql

And for the next time, use:

docker start intro-sql

to start the database again without losing any data.

Codebase setup

First, install all required packages, both dependencies and devDependencies, with the following command:

npm install

Secondly, run the following test command to make sure that everything is in place where it is supposed to be.

npm run dml-test-demo

The final result was envisioned to look like this as a solid beginning to our long journey down this path.

Warm welcoming message

Looking for the next step?

Browse all exercises at docs folder

About

No description or website provided.

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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

Skip to content
BranchesTags
Repository files navigation
SQL Fundamental exercises
Database setup
docker run -p 5432:5432 --name=intro-sql -e POSTGRES_PASSWORD=academy postgres:15
The aforementioned command will construct a database container with the name intro-sql.
To stop the database, run the following command:
docker stop intro-sql
And for the next time, use:
docker start intro-sql
to start the database again without losing any data.
Codebase setup
First, install all required packages, both dependencies and devDependencies, with the following command:
npm install
Secondly, run the following test command to make sure that everything is in place where it is supposed to be.
npm run dml-test-demo
The final result was envisioned to look like this as a solid beginning to our long journey down this path.
Warm welcoming message
Looking for the next step?
Browse all exercises at docs folder
About
No description or website provided.
Topics
bastognepostgresqlsqltpcc
Resources
Readme
Activity
Custom properties
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
SQL Fundamental exercises
Database setup
docker run -p 5432:5432 --name=intro-sql -e POSTGRES_PASSWORD=academy postgres:15
The aforementioned command will construct a database container with the name intro-sql.
To stop the database, run the following command:
docker stop intro-sql
And for the next time, use:
docker start intro-sql
to start the database again without losing any data.
Codebase setup
First, install all required packages, both dependencies and devDependencies, with the following command:
npm install
Secondly, run the following test command to make sure that everything is in place where it is supposed to be.
npm run dml-test-demo
The final result was envisioned to look like this as a solid beginning to our long journey down this path.
Warm welcoming message
Looking for the next step?
Browse all exercises at docs folder
About
No description or website provided.
Topics
bastognepostgresqlsqltpcc
Resources
Readme
Activity
Custom properties
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
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Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
SQL Fundamental exercises
Database setup
docker run -p 5432:5432 --name=intro-sql -e POSTGRES_PASSWORD=academy postgres:15
The aforementioned command will construct a database container with the name intro-sql.
To stop the database, run the following command:
docker stop intro-sql
And for the next time, use:
docker start intro-sql
to start the database again without losing any data.
Codebase setup
First, install all required packages, both dependencies and devDependencies, with the following command:
npm install
Secondly, run the following test command to make sure that everything is in place where it is supposed to be.
npm run dml-test-demo
The final result was envisioned to look like this as a solid beginning to our long journey down this path.
Warm welcoming message
Looking for the next step?
Browse all exercises at docs folder
About
No description or website provided.
Topics
bastognepostgresqlsqltpcc
Resources
Readme
Activity
Custom properties
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
BranchesTags
Repository files navigation
SQL Fundamental exercises
Database setup
docker run -p 5432:5432 --name=intro-sql -e POSTGRES_PASSWORD=academy postgres:15
The aforementioned command will construct a database container with the name intro-sql.
To stop the database, run the following command:
docker stop intro-sql
And for the next time, use:
docker start intro-sql
to start the database again without losing any data.
Codebase setup
First, install all required packages, both dependencies and devDependencies, with the following command:
npm install
Secondly, run the following test command to make sure that everything is in place where it is supposed to be.
npm run dml-test-demo
The final result was envisioned to look like this as a solid beginning to our long journey down this path.
Warm welcoming message
Looking for the next step?
Browse all exercises at docs folder
About
No description or website provided.
Topics
bastognepostgresqlsqltpcc
Resources
Readme
Activity
Custom properties
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
SQL Fundamental exercises
Database setup
docker run -p 5432:5432 --name=intro-sql -e POSTGRES_PASSWORD=academy postgres:15
The aforementioned command will construct a database container with the name intro-sql.
To stop the database, run the following command:
docker stop intro-sql
And for the next time, use:
docker start intro-sql
to start the database again without losing any data.
Codebase setup
First, install all required packages, both dependencies and devDependencies, with the following command:
npm install
Secondly, run the following test command to make sure that everything is in place where it is supposed to be.
npm run dml-test-demo
The final result was envisioned to look like this as a solid beginning to our long journey down this path.
Warm welcoming message
Looking for the next step?
Browse all exercises at docs folder
About
No description or website provided.
Topics
bastognepostgresqlsqltpcc
Resources
Readme
Activity
Custom properties
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
SQL Fundamental exercises
Database setup
docker run -p 5432:5432 --name=intro-sql -e POSTGRES_PASSWORD=academy postgres:15
The aforementioned command will construct a database container with the name intro-sql.
To stop the database, run the following command:
docker stop intro-sql
And for the next time, use:
docker start intro-sql
to start the database again without losing any data.
Codebase setup
First, install all required packages, both dependencies and devDependencies, with the following command:
npm install
Secondly, run the following test command to make sure that everything is in place where it is supposed to be.
npm run dml-test-demo
The final result was envisioned to look like this as a solid beginning to our long journey down this path.
Warm welcoming message
Looking for the next step?
Browse all exercises at docs folder
About
No description or website provided.
Topics
bastognepostgresqlsqltpcc
Resources
Readme
Activity
Custom properties
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

Skip to content
BranchesTags
Repository files navigation
SQL Fundamental exercises
Database setup
docker run -p 5432:5432 --name=intro-sql -e POSTGRES_PASSWORD=academy postgres:15
The aforementioned command will construct a database container with the name intro-sql.
To stop the database, run the following command:
docker stop intro-sql
And for the next time, use:
docker start intro-sql
to start the database again without losing any data.
Codebase setup
First, install all required packages, both dependencies and devDependencies, with the following command:
npm install
Secondly, run the following test command to make sure that everything is in place where it is supposed to be.
npm run dml-test-demo
The final result was envisioned to look like this as a solid beginning to our long journey down this path.
Warm welcoming message
Looking for the next step?
Browse all exercises at docs folder
About
No description or website provided.
Topics
bastognepostgresqlsqltpcc
Resources
Readme
Activity
Custom properties
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Used by
Contributors
Languages