
{"id":104840,"date":"2025-05-30T17:35:52","date_gmt":"2025-05-30T17:35:52","guid":{"rendered":"https:\/\/express24.ir\/d\/product\/%d8%af%d8%a7%d9%86%d9%84%d9%88%d8%af-%d8%af%d9%88%d8%b1%d9%87-udemy-essentialsql-subquery-magic-%d8%aa%d8%b3%d9%84%d8%b7-%d8%a8%d8%b1-%d8%b2%db%8c%d8%b1%d9%be%d8%b1%d8%b3%d9%88\/"},"modified":"2025-05-30T17:35:55","modified_gmt":"2025-05-30T17:35:55","slug":"%d8%af%d8%a7%d9%86%d9%84%d9%88%d8%af-%d8%af%d9%88%d8%b1%d9%87-udemy-essentialsql-subquery-magic-%d8%aa%d8%b3%d9%84%d8%b7-%d8%a8%d8%b1-%d8%b2%db%8c%d8%b1%d9%be%d8%b1%d8%b3%d9%88","status":"publish","type":"product","link":"https:\/\/express24.ir\/d\/product\/%d8%af%d8%a7%d9%86%d9%84%d9%88%d8%af-%d8%af%d9%88%d8%b1%d9%87-udemy-essentialsql-subquery-magic-%d8%aa%d8%b3%d9%84%d8%b7-%d8%a8%d8%b1-%d8%b2%db%8c%d8%b1%d9%be%d8%b1%d8%b3%d9%88\/","title":{"rendered":"\u062f\u0627\u0646\u0644\u0648\u062f \u062f\u0648\u0631\u0647 Udemy EssentialSQL: Subquery Magic \u2013 \u062a\u0633\u0644\u0637 \u0628\u0631 \u0632\u06cc\u0631\u067e\u0631\u0633\u200c\u0648\u062c\u0648\u0647\u0627\u06cc SQL (\u0645\u0647 \u06f2\u06f0\u06f2\u06f4)"},"content":{"rendered":"<table class=\"course-info-table\" border=\"1\" cellpadding=\"8\" cellspacing=\"0\" style=\"width: 100%; margin-bottom: 20px; border-collapse: collapse;\">\n<tr>\n<th style=\"background-color: #f5f5f5; text-align: right; width: 40%;\">\u0646\u0627\u0645 \u0645\u062d\u0635\u0648\u0644 \u0628\u0647 \u0627\u0646\u06af\u0644\u06cc\u0633\u06cc<\/th>\n<td style=\"text-align: right;\">\u062f\u0627\u0646\u0644\u0648\u062f Udemy &#8211; EssentialSQL: Subquery Magic &#8211; Master SQL Sub Queries. 2024-5 &#8211; \u062f\u0627\u0646\u0644\u0648\u062f \u0631\u0627\u06cc\u06af\u0627\u0646 \u0646\u0631\u0645 \u0627\u0641\u0632\u0627\u0631<\/td>\n<\/tr>\n<tr>\n<th style=\"background-color: #f5f5f5; text-align: right;\">\u0646\u0627\u0645 \u0645\u062d\u0635\u0648\u0644 \u0628\u0647 \u0641\u0627\u0631\u0633\u06cc<\/th>\n<td style=\"text-align: right;\">\u062f\u0627\u0646\u0644\u0648\u062f \u062f\u0648\u0631\u0647 Udemy EssentialSQL: Subquery Magic \u2013 \u062a\u0633\u0644\u0637 \u0628\u0631 \u0632\u06cc\u0631\u067e\u0631\u0633\u200c\u0648\u062c\u0648\u0647\u0627\u06cc SQL (\u0645\u0647 \u06f2\u06f0\u06f2\u06f4)<\/td>\n<\/tr>\n<tr>\n<th style=\"background-color: #f5f5f5; text-align: right;\">\u0632\u0628\u0627\u0646<\/th>\n<td style=\"text-align: right;\">\u0627\u0646\u06af\u0644\u06cc\u0633\u06cc \u0628\u0627 \u0632\u06cc\u0631\u0646\u0648\u06cc\u0633 \u0641\u0627\u0631\u0633\u06cc<\/td>\n<\/tr>\n<tr>\n<th style=\"background-color: #f5f5f5; text-align: right;\">\u0646\u0648\u0639 \u0645\u062d\u0635\u0648\u0644<\/th>\n<td style=\"text-align: right;\">\u0622\u0645\u0648\u0632\u0634 \u0648\u06cc\u062f\u06cc\u0648\u06cc\u06cc<\/td>\n<\/tr>\n<tr>\n<th style=\"background-color: #f5f5f5; text-align: right;\">\u0646\u062d\u0648\u0647 \u062a\u062d\u0648\u06cc\u0644<\/th>\n<td style=\"text-align: right;\">\u0628\u0647 \u0635\u0648\u0631\u062a \u062f\u0627\u0646\u0644\u0648\u062f\u06cc<\/td>\n<\/tr>\n<\/table>\n<div style=\"\r\n  background-color: #FFFBEA;\r\n  border: 1px solid #FCD34D;\r\n  border-left: 6px solid #FBBF24;\r\n  padding: 20px;\r\n  border-radius: 10px;\r\n  margin-top: 30px;\r\n  font-family: 'Vazirmatn', sans-serif;\r\n  color: #78350F;\r\n  line-height: 1.8;\r\n  box-shadow: 0 4px 12px rgba(0,0,0,0.04);\r\n\">\r\n  <strong style=\"display: block; font-size: 1.1rem; margin-bottom: 10px;\">\u062a\u0648\u062c\u0647 \u0645\u0647\u0645:<\/strong>\r\n  <p style=\"margin: 0;\">\r\n    \u0627\u06cc\u0646 \u062f\u0648\u0631\u0647 \u0622\u0645\u0648\u0632\u0634\u06cc <span style=\"font-weight: bold;\">\u062f\u0627\u0646\u0644\u0648\u062f\u06cc<\/span> \u0628\u0648\u062f\u0647 \u0648 \u0647\u0645\u0631\u0627\u0647 \u0628\u0627 <span style=\"font-weight: bold;\">\u0632\u06cc\u0631\u0646\u0648\u06cc\u0633 \u0641\u0627\u0631\u0633\u06cc<\/span> \u0627\u0631\u0627\u0626\u0647 \u0645\u06cc\u200c\u06af\u0631\u062f\u062f.\r\n  <\/p>\r\n  <p style=\"margin: 8px 0 0 0;\">\r\n    \u062d\u062f\u0627\u06a9\u062b\u0631 \u062a\u0627 <strong>\u06f2\u06f4 \u0633\u0627\u0639\u062a \u067e\u0633 \u0627\u0632 \u0633\u0641\u0627\u0631\u0634<\/strong>\u060c \u0644\u06cc\u0646\u06a9 \u0627\u062e\u062a\u0635\u0627\u0635\u06cc \u062f\u0648\u0631\u0647 \u0628\u0631\u0627\u06cc \u0634\u0645\u0627 \u0633\u0627\u062e\u062a\u0647 \u0648 \u062c\u0647\u062a \u062f\u0627\u0646\u0644\u0648\u062f \u0627\u0631\u0633\u0627\u0644 \u062e\u0648\u0627\u0647\u062f \u0634\u062f.\r\n  <\/p>\r\n  <p style=\"margin: 8px 0 0 0;\">\r\n    \u062c\u0647\u062a \u067e\u06cc\u06af\u06cc\u0631\u06cc \u0633\u0641\u0627\u0631\u0634\u060c \u0645\u06cc\u200c\u062a\u0648\u0627\u0646\u06cc\u062f \u0627\u0632 \u0637\u0631\u06cc\u0642 \u0648\u0627\u062a\u0633\u200c\u0627\u067e \u0628\u0627 \u0634\u0645\u0627\u0631\u0647 <strong>09395106248<\/strong> \u06cc\u0627 \u0622\u06cc\u062f\u06cc \u062a\u0644\u06af\u0631\u0627\u0645\u06cc <strong>@ma_limbs<\/strong> \u062f\u0631 \u062a\u0645\u0627\u0633 \u0628\u0627\u0634\u06cc\u062f.\r\n  <\/p>\r\n<\/div>\r\n\r\n\n<article class=\"violin-complex-pieces\" style=\"font-family: 'Vazirmatn', sans-serif;color: #2E2E2E;line-height: 1.75;max-width: 800px;margin: 40px auto;padding: 30px;background: #FFFFFF;border-radius: 12px;box-shadow: 0 6px 20px rgba(0,0,0,0.05);\">\n<h1>\u062f\u0627\u0646\u0644\u0648\u062f \u0631\u0627\u06cc\u06af\u0627\u0646 \u062f\u0648\u0631\u0647 Udemy EssentialSQL: Subquery Magic \u2013 \u062a\u0633\u0644\u0637 \u0628\u0631 \u0632\u06cc\u0631\u067e\u0631\u0633\u200c\u0648\u062c\u0648\u0647\u0627\u06cc SQL (\u0645\u0647 \u06f2\u06f0\u06f2\u06f4)<\/h1>\n<div class=\"section-box\">\n<h2>\u0645\u0639\u0631\u0641\u06cc \u062f\u0648\u0631\u0647<\/h2>\n<p>\u062f\u0648\u0631\u0647 <span class=\"highlight\">EssentialSQL: Subquery Magic<\/span> \u06cc\u06a9\u06cc \u0627\u0632 \u062f\u0648\u0631\u0647\u200c\u0647\u0627\u06cc \u06a9\u0627\u0631\u0628\u0631\u062f\u06cc \u0648 \u062c\u0627\u0645\u0639 \u062f\u0631 \u0648\u0628\u200c\u0633\u0627\u06cc\u062a Udemy \u0627\u0633\u062a \u06a9\u0647 \u0628\u0647 \u0622\u0645\u0648\u0632\u0634 <strong>\u0632\u06cc\u0631\u067e\u0631\u0633\u200c\u0648\u062c\u0648\u0647\u0627 (Subqueries)<\/strong> \u062f\u0631 \u0632\u0628\u0627\u0646 SQL \u0627\u062e\u062a\u0635\u0627\u0635 \u062f\u0627\u0631\u062f. \u0627\u06cc\u0646 \u062f\u0648\u0631\u0647 \u0648\u06cc\u0698\u0647 \u0628\u0631\u0646\u0627\u0645\u0647\u200c\u0646\u0648\u06cc\u0633\u0627\u0646\u060c \u062a\u062d\u0644\u06cc\u0644\u200c\u06af\u0631\u0627\u0646 \u062f\u0627\u062f\u0647 \u0648 \u0647\u0631 \u06a9\u0633\u06cc \u0627\u0633\u062a \u06a9\u0647 \u0645\u06cc\u200c\u062e\u0648\u0627\u0647\u062f \u062a\u0648\u0627\u0646\u0627\u06cc\u06cc \u0627\u0633\u062a\u062e\u0631\u0627\u062c \u0627\u0637\u0644\u0627\u0639\u0627\u062a \u067e\u06cc\u0686\u06cc\u062f\u0647 \u0627\u0632 \u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647\u200c\u0647\u0627\u06cc \u0631\u0627\u0628\u0637\u0647\u200c\u0627\u06cc \u0631\u0627 \u0628\u0647 \u0633\u0637\u062d\u06cc \u062d\u0631\u0641\u0647\u200c\u0627\u06cc \u0627\u0631\u062a\u0642\u0627 \u062f\u0647\u062f.<\/p>\n<p>\u0646\u0633\u062e\u0647 <em>\u0645\u0647 \u06f2\u06f0\u06f2\u06f4<\/em> \u0627\u06cc\u0646 \u062f\u0648\u0631\u0647 \u0634\u0627\u0645\u0644 \u062c\u062f\u06cc\u062f\u062a\u0631\u06cc\u0646 \u062a\u06a9\u0646\u06cc\u06a9\u200c\u0647\u0627\u060c \u0645\u062b\u0627\u0644\u200c\u0647\u0627\u06cc \u0639\u0645\u0644\u06cc \u0648 \u062a\u0645\u0631\u06cc\u0646\u200c\u0647\u0627\u06cc \u062a\u0639\u0627\u0645\u0644\u06cc \u0627\u0633\u062a.<\/p>\n<\/div>\n<div class=\"section-box\">\n<h2>\u0622\u0646\u0686\u0647 \u062f\u0631 \u0627\u06cc\u0646 \u062f\u0648\u0631\u0647 \u0645\u06cc\u200c\u0622\u0645\u0648\u0632\u06cc\u062f<\/h2>\n<ul>\n<li>\u062a\u0641\u0627\u0648\u062a <strong>\u0632\u06cc\u0631\u067e\u0631\u0633\u200c\u0648\u062c\u0648\u06cc \u062a\u06a9\u06cc<\/strong> (Scalar Subquery) \u0648 <strong>\u0645\u062c\u0645\u0648\u0639\u0647\u200c\u200c\u0627\u06cc<\/strong> (Multi-row Subquery).<\/li>\n<li>\u0646\u062d\u0648\u0647 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 <span class=\"highlight\">EXISTS<\/span> \u0648 <span class=\"highlight\">NOT EXISTS<\/span> \u0628\u0631\u0627\u06cc \u0628\u0631\u0631\u0633\u06cc \u0648\u062c\u0648\u062f \u06cc\u0627 \u0639\u062f\u0645 \u0648\u062c\u0648\u062f \u0631\u06a9\u0648\u0631\u062f.<\/li>\n<li>\u0627\u0639\u0645\u0627\u0644 <strong>\u0641\u06cc\u0644\u062a\u0631\u0647\u0627\u06cc \u067e\u06cc\u0686\u06cc\u062f\u0647<\/strong> \u0628\u0627 \u062a\u0631\u06a9\u06cc\u0628 \u0686\u0646\u062f\u06cc\u0646 \u0632\u06cc\u0631\u067e\u0631\u0633\u200c\u0648\u062c\u0648.<\/li>\n<li>\u0686\u06af\u0648\u0646\u06af\u06cc \u0646\u0648\u0634\u062a\u0646 <em>Subquery Correlated<\/em> \u0628\u0631\u0627\u06cc \u0648\u0627\u0628\u0633\u062a\u06af\u06cc \u0628\u0647 \u0633\u0637\u0631\u0647\u0627\u06cc \u0628\u06cc\u0631\u0648\u0646\u06cc.<\/li>\n<li>\u0628\u0647\u06cc\u0646\u0647\u200c\u0633\u0627\u0632\u06cc \u0639\u0645\u0644\u06a9\u0631\u062f \u067e\u0631\u0633\u200c\u0648\u062c\u0648\u0647\u0627 \u0628\u0627 <span class=\"highlight\">Indexing<\/span> \u0648 \u0627\u0633\u062a\u0631\u0627\u062a\u0698\u06cc\u200c\u0647\u0627\u06cc \u0645\u0646\u0627\u0633\u0628.<\/li>\n<li>\u06a9\u0627\u0631 \u0628\u0627 \u062f\u0627\u062f\u0647\u200c\u0647\u0627\u06cc \u0632\u0645\u0627\u0646\u06cc (<em>Window Functions<\/em>) \u062f\u0631 \u062a\u0631\u06a9\u06cc\u0628 \u0628\u0627 \u0632\u06cc\u0631\u067e\u0631\u0633\u200c\u0648\u062c\u0648\u0647\u0627.<\/li>\n<li>\u0631\u0648\u0634\u200c\u0647\u0627\u06cc \u0639\u06cc\u0628\u200c\u06cc\u0627\u0628\u06cc \u0648 \u0631\u062f\u06cc\u0627\u0628\u06cc \u0633\u0631\u0639\u062a \u0627\u062c\u0631\u0627\u06cc \u067e\u0631\u0633\u200c\u0648\u062c\u0648 (Query Profiling).<\/li>\n<\/ul>\n<\/div>\n<div class=\"section-box\">\n<h2>\u0645\u0632\u0627\u06cc\u0627\u06cc \u0634\u0631\u06a9\u062a \u062f\u0631 \u062f\u0648\u0631\u0647<\/h2>\n<ul>\n<li>\u0627\u0641\u0632\u0627\u06cc\u0634 \u0645\u0647\u0627\u0631\u062a \u062f\u0631 \u0627\u0633\u062a\u062e\u0631\u0627\u062c \u062f\u0627\u062f\u0647\u200c\u0647\u0627\u06cc \u067e\u06cc\u0686\u06cc\u062f\u0647 \u0627\u0632 \u062f\u06cc\u062a\u0627\u0628\u06cc\u0633\u200c\u0647\u0627\u06cc \u0633\u0627\u0632\u0645\u0627\u0646\u06cc.<\/li>\n<li>\u062a\u0648\u0627\u0646\u0627\u06cc\u06cc \u0637\u0631\u0627\u062d\u06cc \u067e\u0631\u0633\u200c\u0648\u062c\u0648\u0647\u0627\u06cc \u0628\u0647\u06cc\u0646\u0647 \u0648 \u06a9\u0645\u200c\u0647\u0632\u06cc\u0646\u0647 \u0627\u0632 \u0646\u0638\u0631 \u0645\u0635\u0631\u0641 \u0645\u0646\u0627\u0628\u0639.<\/li>\n<li>\u0627\u0631\u062a\u0642\u0627\u06cc \u0631\u0632\u0648\u0645\u0647 \u0628\u0627 \u0645\u062f\u0631\u06a9 \u0645\u0639\u062a\u0628\u0631 Udemy \u0648 \u0646\u0645\u0648\u0646\u0647\u200c\u06a9\u0627\u0631\u0647\u0627\u06cc \u0639\u0645\u0644\u06cc.<\/li>\n<li>\u06a9\u0627\u0647\u0634 \u0632\u0645\u0627\u0646 \u062a\u0648\u0633\u0639\u0647 \u0646\u0631\u0645\u200c\u0627\u0641\u0632\u0627\u0631 \u0628\u0647 \u062f\u0644\u06cc\u0644 \u062f\u0631\u06a9 \u0639\u0645\u06cc\u0642 \u0627\u0632 \u0633\u0627\u062e\u062a\u0627\u0631\u0647\u0627\u06cc SQL.<\/li>\n<li>\u062f\u0633\u062a\u0631\u0633\u06cc \u0628\u0647 \u062c\u0627\u0645\u0639\u0647 \u067e\u0631\u0633\u0634 \u0648 \u067e\u0627\u0633\u062e \u0645\u062a\u062e\u0635\u0635\u0627\u0646 \u062f\u0648\u0631\u0647 \u0628\u0631\u0627\u06cc \u067e\u0634\u062a\u06cc\u0628\u0627\u0646\u06cc \u0648 \u0631\u0641\u0639 \u0627\u0634\u06a9\u0627\u0644.<\/li>\n<\/ul>\n<\/div>\n<div class=\"section-box\">\n<h2>\u067e\u06cc\u0634\u200c\u0646\u06cc\u0627\u0632\u0647\u0627<\/h2>\n<ul>\n<li>\u0622\u0634\u0646\u0627\u06cc\u06cc \u067e\u0627\u06cc\u0647 \u0628\u0627 \u0632\u0628\u0627\u0646 SQL \u0648 \u062f\u0633\u062a\u0648\u0631\u0627\u062a <strong>SELECT<\/strong>, <strong>FROM<\/strong>, <strong>WHERE<\/strong>.<\/li>\n<li>\u062f\u0631\u06a9 \u0627\u0648\u0644\u06cc\u0647 \u0627\u0632 \u0645\u0641\u0627\u0647\u06cc\u0645 <em>JOIN<\/em> \u0648 <em>GROUP BY<\/em>.<\/li>\n<li>\u0646\u0635\u0628 \u0648 \u0631\u0627\u0647\u200c\u0627\u0646\u062f\u0627\u0632\u06cc \u06cc\u06a9 \u0633\u06cc\u0633\u062a\u0645 \u0645\u062f\u06cc\u0631\u06cc\u062a \u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647 \u0645\u0627\u0646\u0646\u062f <strong>MySQL<\/strong> \u06cc\u0627 <strong>PostgreSQL<\/strong>.<\/li>\n<li>\u0622\u0634\u0646\u0627\u06cc\u06cc \u0645\u0642\u062f\u0645\u0627\u062a\u06cc \u0628\u0627 \u0645\u062d\u06cc\u0637 \u062e\u0637 \u0641\u0631\u0645\u0627\u0646 \u06cc\u0627 \u0627\u0628\u0632\u0627\u0631\u0647\u0627\u06cc \u06af\u0631\u0627\u0641\u06cc\u06a9\u06cc \u0645\u0627\u0646\u0646\u062f <strong>phpMyAdmin<\/strong> \u06cc\u0627 <strong>pgAdmin<\/strong>.<\/li>\n<\/ul>\n<\/div>\n<div class=\"section-box\">\n<h2>\u0633\u0631\u0641\u0635\u0644\u200c\u0647\u0627\u06cc \u062f\u0648\u0631\u0647<\/h2>\n<ul>\n<li>\u0628\u062e\u0634 1: \u0645\u0639\u0631\u0641\u06cc \u0632\u06cc\u0631\u067e\u0631\u0633\u200c\u0648\u062c\u0648\u0647\u0627 \u0648 \u06a9\u0627\u0631\u0628\u0631\u062f\u0647\u0627\u06cc \u0639\u0645\u0648\u0645\u06cc<\/li>\n<li>\u0628\u062e\u0634 2: \u0632\u06cc\u0631\u067e\u0631\u0633\u200c\u0648\u062c\u0648\u06cc \u0633\u062a\u0648\u0646\u06cc \u0648 \u0631\u062a\u0628\u0647\u200c\u0627\u06cc (Scalar &#038; Row Subqueries)<\/li>\n<li>\u0628\u062e\u0634 3: \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 EXISTS \u0648 NOT EXISTS<\/li>\n<li>\u0628\u062e\u0634 4: Correlated Subqueries \u0648 \u0645\u0648\u0627\u0631\u062f \u06a9\u0627\u0631\u0628\u0631\u062f<\/li>\n<li>\u0628\u062e\u0634 5: \u0628\u0647\u06cc\u0646\u0647\u200c\u0633\u0627\u0632\u06cc \u0648 \u0627\u06cc\u0646\u062f\u06a9\u0633\u200c\u06af\u0630\u0627\u0631\u06cc<\/li>\n<li>\u0628\u062e\u0634 6: \u0645\u062b\u0627\u0644\u200c\u0647\u0627\u06cc \u062f\u0646\u06cc\u0627\u06cc \u0648\u0627\u0642\u0639\u06cc \u0627\u0632 \u0635\u0646\u0627\u06cc\u0639 \u0645\u062e\u062a\u0644\u0641<\/li>\n<li>\u0628\u062e\u0634 7: \u062a\u0645\u0631\u06cc\u0646\u200c\u0647\u0627\u06cc \u0686\u0627\u0644\u0634\u06cc \u0648 \u067e\u0631\u0648\u0698\u0647 \u0646\u0647\u0627\u06cc\u06cc<\/li>\n<\/ul>\n<\/div>\n<div class=\"section-box\">\n<h2>\u0645\u062b\u0627\u0644\u200c\u0647\u0627\u06cc \u0639\u0645\u0644\u06cc<\/h2>\n<p>\u062f\u0631 \u0627\u062f\u0627\u0645\u0647 \u062f\u0648 \u0645\u062b\u0627\u0644 \u0646\u0645\u0648\u0646\u0647 \u0627\u0632 \u062a\u0645\u0631\u06cc\u0646\u200c\u0647\u0627\u06cc \u0627\u06cc\u0646 \u062f\u0648\u0631\u0647 \u0622\u0648\u0631\u062f\u0647 \u0634\u062f\u0647 \u0627\u0633\u062a:<\/p>\n<ul>\n<li><strong>\u0645\u062b\u0627\u0644 1:<\/strong> \u06cc\u0627\u0641\u062a\u0646 \u0645\u0634\u062a\u0631\u06cc\u0627\u0646\u06cc \u06a9\u0647 \u0628\u06cc\u0634\u062a\u0631\u06cc\u0646 \u0633\u0641\u0627\u0631\u0634 \u0631\u0627 \u062f\u0631 \u0645\u0627\u0647 \u06af\u0630\u0634\u062a\u0647 \u062f\u0627\u0634\u062a\u0647\u200c\u0627\u0646\u062f:\n<pre>SELECT name \nFROM customers \nWHERE id IN (\n  SELECT customer_id \n  FROM orders \n  WHERE order_date BETWEEN '2024-04-01' AND '2024-04-30' \n  GROUP BY customer_id \n  HAVING COUNT(*) = (\n    SELECT MAX(order_count) \n    FROM (\n      SELECT customer_id, COUNT(*) AS order_count \n      FROM orders \n      WHERE order_date BETWEEN '2024-04-01' AND '2024-04-30' \n      GROUP BY customer_id\n    ) AS temp\n  )\n);<\/pre>\n<\/li>\n<li><strong>\u0645\u062b\u0627\u0644 2:<\/strong> \u0628\u0647\u200c\u062f\u0633\u062a \u0622\u0648\u0631\u062f\u0646 \u0645\u062d\u0635\u0648\u0644\u0627\u062a \u067e\u0631\u0641\u0631\u0648\u0634 \u06a9\u0647 \u0645\u0648\u062c\u0648\u062f\u06cc\u200c\u0634\u0627\u0646 \u06a9\u0645\u062a\u0631 \u0627\u0632 \u0645\u06cc\u0627\u0646\u06af\u06cc\u0646 \u0627\u0646\u0628\u0627\u0631 \u0627\u0633\u062a:\n<pre>SELECT product_name, stock \nFROM products \nWHERE stock < (\n  SELECT AVG(stock) \n  FROM products\n) AND product_id IN (\n  SELECT product_id \n  FROM order_items \n  GROUP BY product_id \n  HAVING SUM(quantity) > 100\n);<\/pre>\n<\/li>\n<\/ul>\n<\/div>\n<div class=\"section-box\">\n<h2>\u0686\u0631\u0627 \u0627\u06cc\u0646 \u062f\u0648\u0631\u0647 \u0636\u0631\u0648\u0631\u06cc \u0627\u0633\u062a\u061f<\/h2>\n<p>\u062f\u0631 \u062f\u0646\u06cc\u0627\u06cc \u0627\u0645\u0631\u0648\u0632\u060c \u062d\u062c\u0645 \u062f\u0627\u062f\u0647\u200c\u0647\u0627 \u0631\u0648\u0632\u0628\u0647\u200c\u0631\u0648\u0632 \u0628\u06cc\u0634\u062a\u0631 \u0645\u06cc\u200c\u0634\u0648\u062f \u0648 \u0646\u06cc\u0627\u0632 \u0628\u0647 \u0627\u0633\u062a\u062e\u0631\u0627\u062c \u0627\u0637\u0644\u0627\u0639\u0627\u062a \u062f\u0642\u06cc\u0642 \u0648 \u0633\u0631\u06cc\u0639 \u0627\u0647\u0645\u06cc\u062a \u0632\u06cc\u0627\u062f\u06cc \u067e\u06cc\u062f\u0627 \u06a9\u0631\u062f\u0647 \u0627\u0633\u062a. \u0632\u06cc\u0631\u067e\u0631\u0633\u200c\u0648\u062c\u0648\u0647\u0627 \u0627\u0628\u0632\u0627\u0631 \u0642\u062f\u0631\u062a\u0645\u0646\u062f\u06cc \u0647\u0633\u062a\u0646\u062f \u06a9\u0647 \u0645\u06cc\u200c\u062a\u0648\u0627\u0646\u0646\u062f \u062a\u062d\u0644\u06cc\u0644\u200c\u0647\u0627\u06cc \u067e\u06cc\u0686\u06cc\u062f\u0647 \u0648 \u06af\u0632\u0627\u0631\u0634\u200c\u0647\u0627\u06cc \u062d\u0631\u0641\u0647\u200c\u0627\u06cc \u0631\u0627 \u0645\u0645\u06a9\u0646 \u06a9\u0646\u0646\u062f. \u0628\u0627 \u062a\u0633\u0644\u0637 \u0628\u0631 Subqueries \u0634\u0645\u0627 \u0642\u0627\u062f\u0631 \u062e\u0648\u0627\u0647\u06cc\u062f \u0628\u0648\u062f \u06af\u0632\u0627\u0631\u0634\u200c\u0647\u0627\u06cc \u0633\u0641\u0627\u0631\u0634\u06cc\u200c\u0633\u0627\u0632\u06cc \u0634\u062f\u0647\u060c \u062f\u0627\u0634\u0628\u0648\u0631\u062f\u0647\u0627\u06cc \u067e\u0648\u06cc\u0627 \u0648 \u0639\u0645\u0644\u06cc\u0627\u062a \u067e\u06cc\u0686\u06cc\u062f\u0647 \u0631\u0627 \u0628\u062f\u0648\u0646 \u0646\u06cc\u0627\u0632 \u0628\u0647 \u0686\u0646\u062f\u06cc\u0646 \u067e\u0631\u0633\u200c\u0648\u062c\u0648\u06cc \u062c\u062f\u0627\u06af\u0627\u0646\u0647 \u0627\u0646\u062c\u0627\u0645 \u062f\u0647\u06cc\u062f.<\/p>\n<\/div>\n<div class=\"section-box\">\n<h2>\u062c\u0645\u0639\u200c\u0628\u0646\u062f\u06cc \u0648 \u062f\u0633\u062a\u0631\u0633\u06cc \u0631\u0627\u06cc\u06af\u0627\u0646<\/h2>\n<p>\u0628\u0627 \u062f\u0627\u0646\u0644\u0648\u062f \u0631\u0627\u06cc\u06af\u0627\u0646 \u062f\u0648\u0631\u0647 <span class=\"highlight\">EssentialSQL: Subquery Magic<\/span> \u062f\u0631 \u0645\u0647 \u06f2\u06f0\u06f2\u06f4\u060c \u0641\u0631\u0635\u062a \u0627\u0633\u062a\u062b\u0646\u0627\u06cc\u06cc \u0628\u0631\u0627\u06cc \u0627\u0631\u062a\u0642\u0627\u06cc \u0645\u0647\u0627\u0631\u062a\u200c\u0647\u0627\u06cc SQL \u062e\u0648\u062f \u062f\u0627\u0631\u06cc\u062f. \u0627\u06cc\u0646 \u062f\u0648\u0631\u0647 \u0634\u0645\u0627 \u0631\u0627 \u062f\u0631 \u0645\u0633\u06cc\u0631 \u062a\u0628\u062f\u06cc\u0644 \u0634\u062f\u0646 \u0628\u0647 \u06cc\u06a9 \u0645\u062a\u062e\u0635\u0635 \u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647 \u0648 \u062a\u062d\u0644\u06cc\u0644\u06af\u0631 \u062d\u0631\u0641\u0647\u200c\u0627\u06cc \u0642\u0631\u0627\u0631 \u0645\u06cc\u200c\u062f\u0647\u062f. \u0627\u0632 \u062f\u0633\u062a \u0646\u062f\u0647\u06cc\u062f!<\/p>\n<\/div>\n<\/article>\n","protected":false},"excerpt":{"rendered":"<p>\u0646\u0627\u0645 \u0645\u062d\u0635\u0648\u0644 \u0628\u0647 \u0627\u0646\u06af\u0644\u06cc\u0633\u06cc \u062f\u0627\u0646\u0644\u0648\u062f Udemy &#8211; EssentialSQL: Subquery Magic &#8211; Master SQL Sub Queries. 2024-5 &#8211; \u062f\u0627\u0646\u0644\u0648\u062f \u0631\u0627\u06cc\u06af\u0627\u0646 \u0646\u0631\u0645 [&hellip;]<\/p>\n","protected":false},"featured_media":67493,"comment_status":"open","ping_status":"closed","template":"","meta":{"pmpro_default_level":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}}},"product_cat":[1225],"product_tag":[2825,1933,34478,29184,2229,3706,34476,1935,34477,2826,2865,2095,1608,2277,2485,2656,34472,34473,34475,34474],"class_list":{"0":"post-104840","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-1225","7":"product_tag-2024-course","8":"product_tag-advanced-sql","9":"product_tag-database-query","10":"product_tag-essentialsql","11":"product_tag-free-download","12":"product_tag-sql","13":"product_tag-sql-subqueries","14":"product_tag-sql-training","15":"product_tag-subquery-magic","16":"product_tag-udemy-download","17":"product_tag-udemy-free-course","18":"product_tag--sql","19":"product_tag-1608","20":"product_tag-2277","21":"product_tag--udemy","22":"product_tag-2656","24":"product_tag-34473","25":"product_tag-34475","27":"pmpro-has-access","28":"desktop-align-left","29":"tablet-align-left","30":"mobile-align-left","32":"first","33":"instock","34":"shipping-taxable","35":"purchasable","36":"product-type-variable"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u062f\u0627\u0646\u0644\u0648\u062f \u062f\u0648\u0631\u0647 Udemy EssentialSQL: Subquery Magic \u2013 \u062a\u0633\u0644\u0637 \u0628\u0631 \u0632\u06cc\u0631\u067e\u0631\u0633\u200c\u0648\u062c\u0648\u0647\u0627\u06cc SQL (\u0645\u0647 \u06f2\u06f0\u06f2\u06f4) - \u0641\u0631\u0648\u0634\u06af\u0627\u0647 \u0627\u06a9\u0633\u067e\u0631\u0633<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/express24.ir\/d\/product\/\u062f\u0627\u0646\u0644\u0648\u062f-\u062f\u0648\u0631\u0647-udemy-essentialsql-subquery-magic-\u062a\u0633\u0644\u0637-\u0628\u0631-\u0632\u06cc\u0631\u067e\u0631\u0633\u0648\/\" \/>\n<meta property=\"og:locale\" content=\"fa_IR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u062f\u0627\u0646\u0644\u0648\u062f \u062f\u0648\u0631\u0647 Udemy EssentialSQL: Subquery Magic \u2013 \u062a\u0633\u0644\u0637 \u0628\u0631 \u0632\u06cc\u0631\u067e\u0631\u0633\u200c\u0648\u062c\u0648\u0647\u0627\u06cc SQL (\u0645\u0647 \u06f2\u06f0\u06f2\u06f4) - \u0641\u0631\u0648\u0634\u06af\u0627\u0647 \u0627\u06a9\u0633\u067e\u0631\u0633\" \/>\n<meta property=\"og:description\" content=\"\u0646\u0627\u0645 \u0645\u062d\u0635\u0648\u0644 \u0628\u0647 \u0627\u0646\u06af\u0644\u06cc\u0633\u06cc \u062f\u0627\u0646\u0644\u0648\u062f Udemy &#8211; EssentialSQL: Subquery Magic &#8211; Master SQL Sub Queries. 2024-5 &#8211; \u062f\u0627\u0646\u0644\u0648\u062f \u0631\u0627\u06cc\u06af\u0627\u0646 \u0646\u0631\u0645 [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/express24.ir\/d\/product\/\u062f\u0627\u0646\u0644\u0648\u062f-\u062f\u0648\u0631\u0647-udemy-essentialsql-subquery-magic-\u062a\u0633\u0644\u0637-\u0628\u0631-\u0632\u06cc\u0631\u067e\u0631\u0633\u0648\/\" \/>\n<meta property=\"og:site_name\" content=\"\u0641\u0631\u0648\u0634\u06af\u0627\u0647 \u0627\u06a9\u0633\u067e\u0631\u0633\" \/>\n<meta property=\"article:modified_time\" content=\"2025-05-30T17:35:55+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/express24.ir\/d\/wp-content\/uploads\/2025\/05\/Express24_ir.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1024\" \/>\n\t<meta property=\"og:image:height\" content=\"1024\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u0632\u0645\u0627\u0646 \u062a\u0642\u0631\u06cc\u0628\u06cc \u0628\u0631\u0627\u06cc \u062e\u0648\u0627\u0646\u062f\u0646\" \/>\n\t<meta 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