{"id":15850,"date":"2022-10-13T07:16:03","date_gmt":"2022-10-13T01:46:03","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-find-minimum-datetime-while-using-fk-in-two-different-tables\/"},"modified":"2022-10-13T07:16:03","modified_gmt":"2022-10-13T01:46:03","slug":"solved-find-minimum-datetime-while-using-fk-in-two-different-tables","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-find-minimum-datetime-while-using-fk-in-two-different-tables\/","title":{"rendered":"[Solved] Find minimum datetime while using FK in two different tables"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-41587048\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"41587048\" data-parentid=\"41585901\" data-score=\"0\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>With 2 courses you are always going to get 2 rows when joining like this. It will give you the minimum date value for each course. The first way you can get a single row is to use <code>TOP 1<\/code> in your query, which will simply give you the course with the earliest test date. The other way is to use a <code>WHERE<\/code> clause to filter it by a single course.<\/p>\n<p>Please run this sample code with some variations of what you can do, notes included in comments:<\/p>\n<pre><code>CREATE TABLE #course ( id INT, name NVARCHAR(20) );\n\nCREATE TABLE #Test\n    (\n      id INT ,\n      courseId INT ,\n      testDate DATETIME -- you shouldn't use a keyword for a column name\n    );\n\nINSERT  INTO #course\n        ( id, name )\nVALUES  ( 1, 'Maths' ),\n        ( 2, 'Science' );\n\n-- note I used DATEADD(HOUR, -1, GETDATE()) to simply get some random datetime values\nINSERT  INTO #Test\n        ( id, courseId, testDate )\nVALUES  ( 1, 1, DATEADD(HOUR, -1, GETDATE()) ),\n        ( 2, 1, DATEADD(HOUR, -2, GETDATE()) ),\n        ( 3, 1, DATEADD(HOUR, -3, GETDATE()) ),\n        ( 4, 2, DATEADD(HOUR, -4, GETDATE()) ),\n        ( 5, 2, DATEADD(HOUR, -5, GETDATE()) ),\n        ( 6, 2, DATEADD(HOUR, -6, GETDATE()) ),\n        ( 7, 2, DATEADD(HOUR, -7, GETDATE()) ),\n        ( 8, 2, DATEADD(HOUR, -8, GETDATE()) );\n\n-- returns minumum date for each course - 2 rows\nSELECT  MIN(t.testDate) AS TestDate ,\n        t.courseId ,\n        c.name\nFROM    #Test t \n        -- used inner join as could see no reason for left join\n        INNER JOIN #course c ON t.courseId = c.id\nGROUP BY courseId , name;\n\n-- to get course with minimum date - 1 row\nSELECT TOP 1\n        MIN(t.testDate) AS TestDate ,\n        t.courseId ,\n        c.name\nFROM    #Test t \n        -- used inner join as could see no reason for left join\n        INNER JOIN #course c ON t.courseId = c.id\nGROUP BY t.courseId , c.name\nORDER BY MIN(t.testDate); -- requires order by\n\n-- to get minimum date for a specified course - 1 row\nSELECT  MIN(t.testDate) AS TestDate ,\n        t.courseId ,\n        c.name\nFROM    #Test t \n        -- used inner join as could see no reason for left join\n        INNER JOIN #course c ON t.courseId = c.id\nWHERE t.courseId = 1 -- requires you specify a course id\nGROUP BY courseId , name;\n\nDROP TABLE #course;\nDROP TABLE #Test;\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">13<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Find minimum datetime while using FK in two different tables <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] With 2 courses you are always going to get 2 rows when joining like this. It will give you the minimum date value for each course. The first way you can get a single row is to use TOP 1 in your query, which will simply give you the course with the earliest test &#8230; <a title=\"[Solved] Find minimum datetime while using FK in two different tables\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-find-minimum-datetime-while-using-fk-in-two-different-tables\/\" aria-label=\"More on [Solved] Find minimum datetime while using FK in two different tables\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[2219,534,500,1009],"class_list":["post-15850","post","type-post","status-publish","format-standard","hentry","category-solved","tag-foreign-keys","tag-join","tag-sql-server","tag-tsql"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>[Solved] Find minimum datetime while using FK in two different tables - JassWeb<\/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:\/\/jassweb.com\/solved\/solved-find-minimum-datetime-while-using-fk-in-two-different-tables\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Find minimum datetime while using FK in two different tables - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] With 2 courses you are always going to get 2 rows when joining like this. 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