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SQL Challenge Solutions

My personal solutions for HackerRank SQL domain challenges.

Contents:

  1. Basic Select
  2. Advanced Select
  3. Aggregation
  4. Basic Join
  5. Advance Join

All solutions are tested and passed on the HackerRank platform.

About

No description or website provided.

Topics

career-developmenthackerrankhackerrank-solutionshackerrank-solutions-githubhackerrank-sqlhackerrank-sql-challengehackerrank-sql-solutionsinterviewinterview-practiceinterview-preparationinterview-questionsmysqlself-developmentsql

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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" + '

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NameName
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Advance Join
Advance Join
Advanced Select
Advanced Select
Aggregation
Aggregation
Basic Join
Basic Join
Basic Select
Basic Select
README.md
README.md
Repository files navigation
SQL Challenge Solutions
My personal solutions for HackerRank SQL domain challenges.
Contents:
  1. Basic Select
  2. Advanced Select
  3. Aggregation
  4. Basic Join
  5. Advance Join
All solutions are tested and passed on the HackerRank platform.
About
No description or website provided.
Topics
career-developmenthackerrankhackerrank-solutionshackerrank-solutions-githubhackerrank-sqlhackerrank-sql-challengehackerrank-sql-solutionsinterviewinterview-practiceinterview-preparationinterview-questionsmysqlself-developmentsql
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, '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('^' + ".*" + '

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Advance Join
Advance Join
Advanced Select
Advanced Select
Aggregation
Aggregation
Basic Join
Basic Join
Basic Select
Basic Select
README.md
README.md
Repository files navigation
SQL Challenge Solutions
My personal solutions for HackerRank SQL domain challenges.
Contents:
  1. Basic Select
  2. Advanced Select
  3. Aggregation
  4. Basic Join
  5. Advance Join
All solutions are tested and passed on the HackerRank platform.
About
No description or website provided.
Topics
career-developmenthackerrankhackerrank-solutionshackerrank-solutions-githubhackerrank-sqlhackerrank-sql-challengehackerrank-sql-solutionsinterviewinterview-practiceinterview-preparationinterview-questionsmysqlself-developmentsql
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, '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('^' + ".*" + '

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NameName
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Advance Join
Advance Join
Advanced Select
Advanced Select
Aggregation
Aggregation
Basic Join
Basic Join
Basic Select
Basic Select
README.md
README.md
Repository files navigation
SQL Challenge Solutions
My personal solutions for HackerRank SQL domain challenges.
Contents:
  1. Basic Select
  2. Advanced Select
  3. Aggregation
  4. Basic Join
  5. Advance Join
All solutions are tested and passed on the HackerRank platform.
About
No description or website provided.
Topics
career-developmenthackerrankhackerrank-solutionshackerrank-solutions-githubhackerrank-sqlhackerrank-sql-challengehackerrank-sql-solutionsinterviewinterview-practiceinterview-preparationinterview-questionsmysqlself-developmentsql
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, '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" + '

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NameName
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Advance Join
Advance Join
Advanced Select
Advanced Select
Aggregation
Aggregation
Basic Join
Basic Join
Basic Select
Basic Select
README.md
README.md
Repository files navigation
SQL Challenge Solutions
My personal solutions for HackerRank SQL domain challenges.
Contents:
  1. Basic Select
  2. Advanced Select
  3. Aggregation
  4. Basic Join
  5. Advance Join
All solutions are tested and passed on the HackerRank platform.
About
No description or website provided.
Topics
career-developmenthackerrankhackerrank-solutionshackerrank-solutions-githubhackerrank-sqlhackerrank-sql-challengehackerrank-sql-solutionsinterviewinterview-practiceinterview-preparationinterview-questionsmysqlself-developmentsql
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, '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('^' + ".*" + '

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BranchesTags
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2 Commits
Folders and files
NameName
Last commit message
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Advance Join
Advance Join
Advanced Select
Advanced Select
Aggregation
Aggregation
Basic Join
Basic Join
Basic Select
Basic Select
README.md
README.md
Repository files navigation
SQL Challenge Solutions
My personal solutions for HackerRank SQL domain challenges.
Contents:
  1. Basic Select
  2. Advanced Select
  3. Aggregation
  4. Basic Join
  5. Advance Join
All solutions are tested and passed on the HackerRank platform.
About
No description or website provided.
Topics
career-developmenthackerrankhackerrank-solutionshackerrank-solutions-githubhackerrank-sqlhackerrank-sql-challengehackerrank-sql-solutionsinterviewinterview-practiceinterview-preparationinterview-questionsmysqlself-developmentsql
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, '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
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2 Commits
Folders and files
NameName
Last commit message
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Advance Join
Advance Join
Advanced Select
Advanced Select
Aggregation
Aggregation
Basic Join
Basic Join
Basic Select
Basic Select
README.md
README.md
Repository files navigation
SQL Challenge Solutions
My personal solutions for HackerRank SQL domain challenges.
Contents:
  1. Basic Select
  2. Advanced Select
  3. Aggregation
  4. Basic Join
  5. Advance Join
All solutions are tested and passed on the HackerRank platform.
About
No description or website provided.
Topics
career-developmenthackerrankhackerrank-solutionshackerrank-solutions-githubhackerrank-sqlhackerrank-sql-challengehackerrank-sql-solutionsinterviewinterview-practiceinterview-preparationinterview-questionsmysqlself-developmentsql
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, '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); }
})();
})();

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2 Commits
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NameName
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Advance Join
Advance Join
Advanced Select
Advanced Select
Aggregation
Aggregation
Basic Join
Basic Join
Basic Select
Basic Select
README.md
README.md
Repository files navigation
SQL Challenge Solutions
My personal solutions for HackerRank SQL domain challenges.
Contents:
  1. Basic Select
  2. Advanced Select
  3. Aggregation
  4. Basic Join
  5. Advance Join
All solutions are tested and passed on the HackerRank platform.
About
No description or website provided.
Topics
career-developmenthackerrankhackerrank-solutionshackerrank-solutions-githubhackerrank-sqlhackerrank-sql-challengehackerrank-sql-solutionsinterviewinterview-practiceinterview-preparationinterview-questionsmysqlself-developmentsql
Resources
Readme
Activity
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0 forks
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