{"id":10781,"date":"2022-09-24T23:31:38","date_gmt":"2022-09-24T18:01:38","guid":{"rendered":"http:\/\/jassweb.com\/solved\/solved-select-from-users-where-userid-null-or-is-this-t-sql-query-valid-or-not\/"},"modified":"2022-09-24T23:31:38","modified_gmt":"2022-09-24T18:01:38","slug":"solved-select-from-users-where-userid-null-or-is-this-t-sql-query-valid-or-not","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-select-from-users-where-userid-null-or-is-this-t-sql-query-valid-or-not\/","title":{"rendered":"[Solved] SELECT * FROM USERS where userid = (null or &#8221;) is this t sql query valid or not?"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-57057380\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"57057380\" data-parentid=\"57057097\" data-score=\"6\" 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>The comparison <\/p>\n<pre><code> userid = (null OR '')  \n<\/code><\/pre>\n<p>is <strong>invalid<\/strong>. First, the very syntax is wrong:<\/p>\n<pre><code> field = (value1 OR value2) \n<\/code><\/pre>\n<p>should be put either as<\/p>\n<pre><code>(field = value1) OR (field = value2)  \n<\/code><\/pre>\n<p>or as<\/p>\n<pre><code> field IN (value1, value2) \n<\/code><\/pre>\n<p>Second, <code>null<\/code> is a <em>special value<\/em>, which stands for <em>unknown<\/em>, <em>doesn&#8217;t matter<\/em>, <em>unapplicable<\/em> etc. and that&#8217;s why <code>null = null<\/code> is equal not to <code>True<\/code>, but to <code>null<\/code> (does <em>unknown<\/em> equal to <em>unknown<\/em>? It&#8217;s <em>unknown<\/em>.) There are some exceptions when <code>null = null<\/code> is <code>True<\/code> (e.g. <code>GroupBy<\/code>). However, in order to be on the <em>safe side<\/em> do not put <code>field = null<\/code> or <code>field in (..., null, ...)<\/code>, but <code>field is null<\/code>.<br \/>\nIn your case<\/p>\n<pre><code>SELECT * \n  FROM users\n WHERE (userid is null) \n    OR (userid = '')\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\"><\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved SELECT * FROM USERS where userid = (null or &#8221;) is this t sql query valid or not? <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] The comparison userid = (null OR &#8221;) is invalid. First, the very syntax is wrong: field = (value1 OR value2) should be put either as (field = value1) OR (field = value2) or as field IN (value1, value2) Second, null is a special value, which stands for unknown, doesn&#8217;t matter, unapplicable etc. and that&#8217;s &#8230; <a title=\"[Solved] SELECT * FROM USERS where userid = (null or &#8221;) is this t sql query valid or not?\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-select-from-users-where-userid-null-or-is-this-t-sql-query-valid-or-not\/\" aria-label=\"More on [Solved] SELECT * FROM USERS where userid = (null or &#8221;) is this t sql query valid or not?\">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":[352,324,341,500],"class_list":["post-10781","post","type-post","status-publish","format-standard","hentry","category-solved","tag-net","tag-c","tag-sql","tag-sql-server"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] SELECT * FROM USERS where userid = (null or &#039;&#039;) is this t sql query valid or not? - 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-select-from-users-where-userid-null-or-is-this-t-sql-query-valid-or-not\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] SELECT * FROM USERS where userid = (null or &#039;&#039;) is this t sql query valid or not? - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] The comparison userid = (null OR &#039;&#039;) is invalid. First, the very syntax is wrong: field = (value1 OR value2) should be put either as (field = value1) OR (field = value2) or as field IN (value1, value2) Second, null is a special value, which stands for unknown, doesn&#8217;t matter, unapplicable etc. and that&#8217;s ... Read more\" \/>\n<meta property=\"og:url\" content=\"https:\/\/jassweb.com\/solved\/solved-select-from-users-where-userid-null-or-is-this-t-sql-query-valid-or-not\/\" \/>\n<meta property=\"og:site_name\" content=\"JassWeb\" \/>\n<meta property=\"article:published_time\" content=\"2022-09-24T18:01:38+00:00\" \/>\n<meta name=\"author\" content=\"Kirat\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Kirat\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/jassweb.com\/solved\/solved-select-from-users-where-userid-null-or-is-this-t-sql-query-valid-or-not\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/jassweb.com\/solved\/solved-select-from-users-where-userid-null-or-is-this-t-sql-query-valid-or-not\/\"},\"author\":{\"name\":\"Kirat\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31\"},\"headline\":\"[Solved] SELECT * FROM USERS where userid = (null or &#8221;) is this t sql query valid or not?\",\"datePublished\":\"2022-09-24T18:01:38+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/jassweb.com\/solved\/solved-select-from-users-where-userid-null-or-is-this-t-sql-query-valid-or-not\/\"},\"wordCount\":108,\"publisher\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#organization\"},\"keywords\":[\".net\",\"c++\",\"sql\",\"sql-server\"],\"articleSection\":[\"Solved\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/jassweb.com\/solved\/solved-select-from-users-where-userid-null-or-is-this-t-sql-query-valid-or-not\/\",\"url\":\"https:\/\/jassweb.com\/solved\/solved-select-from-users-where-userid-null-or-is-this-t-sql-query-valid-or-not\/\",\"name\":\"[Solved] SELECT * FROM USERS where userid = (null or '') is this t sql query valid or not? - JassWeb\",\"isPartOf\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#website\"},\"datePublished\":\"2022-09-24T18:01:38+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/jassweb.com\/solved\/solved-select-from-users-where-userid-null-or-is-this-t-sql-query-valid-or-not\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/jassweb.com\/solved\/solved-select-from-users-where-userid-null-or-is-this-t-sql-query-valid-or-not\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/jassweb.com\/solved\/solved-select-from-users-where-userid-null-or-is-this-t-sql-query-valid-or-not\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/jassweb.com\/solved\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"[Solved] SELECT * FROM USERS where userid = (null or &#8221;) is this t sql query valid or not?\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/jassweb.com\/solved\/#website\",\"url\":\"https:\/\/jassweb.com\/solved\/\",\"name\":\"JassWeb\",\"description\":\"Build High-quality Websites\",\"publisher\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/jassweb.com\/solved\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/jassweb.com\/solved\/#organization\",\"name\":\"Jass Web\",\"url\":\"https:\/\/jassweb.com\/solved\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/jassweb.com\/wp-content\/uploads\/2021\/02\/jass-website-logo-1.png\",\"contentUrl\":\"https:\/\/jassweb.com\/wp-content\/uploads\/2021\/02\/jass-website-logo-1.png\",\"width\":693,\"height\":132,\"caption\":\"Jass Web\"},\"image\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/logo\/image\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31\",\"name\":\"Kirat\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1775193939\",\"contentUrl\":\"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1775193939\",\"caption\":\"Kirat\"},\"sameAs\":[\"http:\/\/jassweb.com\"],\"url\":\"https:\/\/jassweb.com\/solved\/author\/jaspritsinghghumangmail-com\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"[Solved] SELECT * FROM USERS where userid = (null or '') is this t sql query valid or not? - JassWeb","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/jassweb.com\/solved\/solved-select-from-users-where-userid-null-or-is-this-t-sql-query-valid-or-not\/","og_locale":"en_US","og_type":"article","og_title":"[Solved] SELECT * FROM USERS where userid = (null or '') is this t sql query valid or not? - JassWeb","og_description":"[ad_1] The comparison userid = (null OR '') is invalid. First, the very syntax is wrong: field = (value1 OR value2) should be put either as (field = value1) OR (field = value2) or as field IN (value1, value2) Second, null is a special value, which stands for unknown, doesn&#8217;t matter, unapplicable etc. and that&#8217;s ... Read more","og_url":"https:\/\/jassweb.com\/solved\/solved-select-from-users-where-userid-null-or-is-this-t-sql-query-valid-or-not\/","og_site_name":"JassWeb","article_published_time":"2022-09-24T18:01:38+00:00","author":"Kirat","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Kirat","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/jassweb.com\/solved\/solved-select-from-users-where-userid-null-or-is-this-t-sql-query-valid-or-not\/#article","isPartOf":{"@id":"https:\/\/jassweb.com\/solved\/solved-select-from-users-where-userid-null-or-is-this-t-sql-query-valid-or-not\/"},"author":{"name":"Kirat","@id":"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31"},"headline":"[Solved] SELECT * FROM USERS where userid = (null or &#8221;) is this t sql query valid or not?","datePublished":"2022-09-24T18:01:38+00:00","mainEntityOfPage":{"@id":"https:\/\/jassweb.com\/solved\/solved-select-from-users-where-userid-null-or-is-this-t-sql-query-valid-or-not\/"},"wordCount":108,"publisher":{"@id":"https:\/\/jassweb.com\/solved\/#organization"},"keywords":[".net","c++","sql","sql-server"],"articleSection":["Solved"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/jassweb.com\/solved\/solved-select-from-users-where-userid-null-or-is-this-t-sql-query-valid-or-not\/","url":"https:\/\/jassweb.com\/solved\/solved-select-from-users-where-userid-null-or-is-this-t-sql-query-valid-or-not\/","name":"[Solved] SELECT * FROM USERS where userid = (null or '') is this t sql query valid or not? - JassWeb","isPartOf":{"@id":"https:\/\/jassweb.com\/solved\/#website"},"datePublished":"2022-09-24T18:01:38+00:00","breadcrumb":{"@id":"https:\/\/jassweb.com\/solved\/solved-select-from-users-where-userid-null-or-is-this-t-sql-query-valid-or-not\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/jassweb.com\/solved\/solved-select-from-users-where-userid-null-or-is-this-t-sql-query-valid-or-not\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/jassweb.com\/solved\/solved-select-from-users-where-userid-null-or-is-this-t-sql-query-valid-or-not\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/jassweb.com\/solved\/"},{"@type":"ListItem","position":2,"name":"[Solved] SELECT * FROM USERS where userid = (null or &#8221;) is this t sql query valid or not?"}]},{"@type":"WebSite","@id":"https:\/\/jassweb.com\/solved\/#website","url":"https:\/\/jassweb.com\/solved\/","name":"JassWeb","description":"Build High-quality Websites","publisher":{"@id":"https:\/\/jassweb.com\/solved\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/jassweb.com\/solved\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/jassweb.com\/solved\/#organization","name":"Jass Web","url":"https:\/\/jassweb.com\/solved\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/jassweb.com\/solved\/#\/schema\/logo\/image\/","url":"https:\/\/jassweb.com\/wp-content\/uploads\/2021\/02\/jass-website-logo-1.png","contentUrl":"https:\/\/jassweb.com\/wp-content\/uploads\/2021\/02\/jass-website-logo-1.png","width":693,"height":132,"caption":"Jass Web"},"image":{"@id":"https:\/\/jassweb.com\/solved\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31","name":"Kirat","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/jassweb.com\/solved\/#\/schema\/person\/image\/","url":"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1775193939","contentUrl":"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1775193939","caption":"Kirat"},"sameAs":["http:\/\/jassweb.com"],"url":"https:\/\/jassweb.com\/solved\/author\/jaspritsinghghumangmail-com\/"}]}},"_links":{"self":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/posts\/10781","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/comments?post=10781"}],"version-history":[{"count":0,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/posts\/10781\/revisions"}],"wp:attachment":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/media?parent=10781"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/categories?post=10781"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/tags?post=10781"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}