{"id":20157,"date":"2023-01-10T12:30:19","date_gmt":"2023-01-10T12:30:19","guid":{"rendered":"https:\/\/datasciencepartners.nl\/?p=20157"},"modified":"2023-01-17T16:02:48","modified_gmt":"2023-01-17T16:02:48","slug":"sql-comments","status":"publish","type":"post","link":"https:\/\/datasciencepartners.nl\/sql-comments\/","title":{"rendered":"SQL Comments: hoe plaats ik comments in SQL?"},"content":{"rendered":"<div class=\"vgblk-rw-wrapper limit-wrapper\">\n<h2>Introductie in SQL comments<\/h2>\n<p>Om verschillende redenen kan het handig zijn om <a href=\"https:\/\/datasciencepartners.nl\/wat-is-sql\/\">SQL<\/a> comments (commentaar) aan code toe te voegen.<\/p>\n<p>Bijvoorbeeld:<\/p>\n<ul>\n<li>Voor verduidelijking van de code<\/li>\n<li>Om aan te geven wat er nog moet gebeuren<\/li>\n<\/ul>\n<p>In iedere programmeertaal werkt commentaar toevoegen weer anders. In dit artikel gaan we in op hoe je comments toevoegt in SQL. SQL is een taal die ontwikkeld is om d.m.v. <a href=\"https:\/\/datasciencepartners.nl\/wat-is-een-sql-query\/\">query's<\/a> met <a href=\"https:\/\/datasciencepartners.nl\/wat-is-een-relationele-database\/\">relationele databases<\/a> te werken.<\/p>\n<!-- This site is converting visitors into subscribers and customers with OptinMonster - https:\/\/optinmonster.com :: Campaign Title: Cheatsheet SQL -->\n<div id=\"om-q5alrrxcvjahxbmp37hr-holder\"><\/div>\n<script>(function(d,u,ac){var s=d.createElement('script');s.type='text\/javascript';s.src='https:\/\/a.omappapi.com\/app\/js\/api.min.js';s.async=true;s.dataset.user=u;s.dataset.campaign=ac;d.getElementsByTagName('head')[0].appendChild(s);})(document,77079,'q5alrrxcvjahxbmp37hr');<\/script>\n<!-- \/ OptinMonster -->\n<p>Onderstaand zien we een eerste voorbeeld van een comment:<\/p>\n<pre><code class=\"language-sql\">SELECT\n  -- Select all columns\n  *\nFROM\n  movies\nWHERE\n  year &gt; 2000\nORDER BY\n  rank DESC;<\/code><\/pre>\n<p><\/p>\n<p>We zullen op deze pagina de volgende onderwerpen onderscheiden:<\/p>\n<ol>\n<li><a href=\"#sql_line_comments\">Line comments in SQL<\/a><\/li>\n<li><a href=\"#sql_block_comments\">Block comments in SQL<\/a><\/li>\n<\/ol>\n<hr \/>\n<p><\/p>\n<div id=\"sql_line_comments\"><\/div>\n<h2>1. SQL line comments<\/h2>\n<p>Wanneer je commentaar in <strong>1 regel<\/strong> wilt plaatsen, gebruik je een <strong>line comment<\/strong>.<\/p>\n<p>Hiervoor gebruik je twee streepjes:<\/p>\n<pre><code class=\"language-sql\">-- &lt;comment&gt;<\/code><\/pre>\n<p>Zie onderstaand voorbeeld:<\/p>\n<pre><code class=\"language-sql\">SELECT\n  -- This is a line comment\n  *\nFROM\n  movies\nWHERE\n  year &gt; 2000\nORDER BY\n  rank DESC;<\/code><\/pre>\n<p><\/p>\n<hr \/>\n<p><\/p>\n<!-- This site is converting visitors into subscribers and customers with OptinMonster - https:\/\/optinmonster.com :: Campaign Title: Cheatsheet SQL -->\n<div id=\"om-q5alrrxcvjahxbmp37hr-holder\"><\/div>\n<script>(function(d,u,ac){var s=d.createElement('script');s.type='text\/javascript';s.src='https:\/\/a.omappapi.com\/app\/js\/api.min.js';s.async=true;s.dataset.user=u;s.dataset.campaign=ac;d.getElementsByTagName('head')[0].appendChild(s);})(document,77079,'q5alrrxcvjahxbmp37hr');<\/script>\n<!-- \/ OptinMonster -->\n<div id=\"sql_block_comments\"><\/div>\n<p><div class=\"blogBanner\">Leren werken met SQL voor data analayse? Na onze 2-daagse SQL cursus kun je volledig zelfstandig werken met SQL.<\/p>\n<p><a href=\"https:\/\/datasciencepartners.nl\/sql-cursus\/\"><button>SQL cursus voor data analyse<\/button><\/a>\n<\/div>\n<\/p>\n<h2>2. SQL block comments<\/h2>\n<p>Wanneer je commentaar in <strong>meerdere regels<\/strong> wilt plaatsen, gebruik je een <strong>block comment<\/strong>.<\/p>\n<p>Hiervoor gebruik je om te openen <code>\/*<\/code>, en om te sluiten <code>*\/<\/code>:<\/p>\n<pre><code class=\"language-sql\">\/*\nThis is a block comment.\nIt allows comments in multiple lines.\nIndeed, multiple lines.\n*\/<\/code><\/pre>\n<p>Zie onderstaand voorbeeld:<\/p>\n<pre><code class=\"language-sql\">\/*\nAuthor:         SQL training\nCreation date:  Not so long ago \nDescription:    Select data from movies table starting at year 2000\n*\/\nSELECT\n  *\nFROM\n  movies\nWHERE\n  year &gt; 2000\nORDER BY\n  rank DESC;<\/code><\/pre>\n<p><\/p>\n<hr \/>\n<p><\/p>\n<h2>Bezig om SQL onder de knie te krijgen?<\/h2>\n<p>Wellicht ben je bezig om SQL beter te leren. Wij schreven de volgende handige artikelen om je op weg te helpen:<\/p>\n<ul>\n<li><strong><a href=\"https:\/\/datasciencepartners.nl\/waarom-sql-leren-redenen\/\">Waarom SQL leren een goed idee is<\/a><\/strong><\/li>\n<li><strong><a href=\"https:\/\/datasciencepartners.nl\/sql-voorbeelden\/\">Voorbeelden van wat je met SQL kunt<\/a><\/strong><\/li>\n<li><strong><a href=\"https:\/\/datasciencepartners.nl\/hoe-sql-leren\/\">Hoe leer ik SQL in 4 stappen<\/a><\/strong><\/li>\n<li><strong><a href=\"https:\/\/datasciencepartners.nl\/postgresql-pgadmin-installeren-mac-windows\/\">PostgreSQL &amp; PgAdmin installeren om op jouw computer met SQL te kunnen werken<\/a><\/strong><\/li>\n<\/ul>\n<h2>Samenvatting SQL commenting<\/h2>\n<ul>\n<li>Met comments kun je commentaar toevoegen aan SQL code.<\/li>\n<li>Line comments op <strong>\u00e9\u00e9n regel<\/strong>:\n<pre><code class=\"language-sql\">-- This is a line comment<\/code><\/pre>\n<\/li>\n<li>Block comments op <strong>meerdere regels<\/strong>:\n<pre><code class=\"language-sql\">\/*\nThis is a block comment.\nIt allows comments in multiple lines.\nIndeed, multiple lines.\n*\/<\/code><\/pre>\n<\/li>\n<\/ul>\n<p><strong>Wil je nog veel meer leren over SQL? Bekijk dan onze <a href=\"https:\/\/datasciencepartners.nl\/sql-cursus\/\">SQL cursus voor data analyse<\/a> of download onderstaande opleidingsbrochure. In onze SQL cursus wisselen theorie en praktijkoefening elkaar steeds af. Nadat je deze training hebt gevolgd kun je zelfstandig met SQL werken. Je kunt ook altijd even contact opnemen via <a href=\"mailto:info@datasciencepartners.nl\">info@datasciencepartners.nl<\/a> of <a href=\"tel:0202443146\">020 - 24 43 146<\/a> als je een vraag hebt.<\/strong><\/p>\n<p><a href=\"https:\/\/datasciencepartners.nl\/opleidingsbrochures\/\" class=\"trainingsbrochure-centreren\"><img decoding=\"async\" src=\"https:\/\/datasciencepartners.nl\/wp-content\/uploads\/2022\/10\/sql-cursus-voor-data-analyse-training.png\"><\/a><\/p>\n<\/div>\n<p><!-- .vgblk-rw-wrapper --><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Introductie in SQL comments Om verschillende redenen kan het handig zijn om SQL comments (commentaar) aan code toe te voegen. Bijvoorbeeld: Voor verduidelijking van de code Om aan te geven wat er nog moet gebeuren In iedere programmeertaal werkt commentaar toevoegen weer anders. In dit artikel gaan we in op hoe je comments toevoegt in&#8230;<\/p>\n","protected":false},"author":5,"featured_media":20159,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"footnotes":""},"categories":[119],"tags":[],"class_list":["post-20157","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sql"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.7 (Yoast SEO v27.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>SQL Comments: hoe plaats ik comments in SQL? [uitleg &amp; voorbeelden]<\/title>\n<meta name=\"description\" content=\"In dit artikel leer je hoe je in SQL comments plaatst. 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Peter heeft veel data analyses uitgevoerd en processen geautomatiseerd met Python in productieomgevingen.","sameAs":["https:\/\/www.linkedin.com\/in\/petertieleman\/"],"honorificPrefix":"Heer","honorificSuffix":"Ir.","birthDate":"1988-05-26","gender":"mannelijk","knowsAbout":["Python","R","Data Science","AI","SQL","Data Engineering"],"knowsLanguage":["Nederlands","Engels"],"jobTitle":"Data Scientist & AI Engineer","worksFor":"Data Science Partners","url":"https:\/\/datasciencepartners.nl\/author\/peter-tieleman\/"}]}},"_links":{"self":[{"href":"https:\/\/datasciencepartners.nl\/wp-json\/wp\/v2\/posts\/20157","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/datasciencepartners.nl\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/datasciencepartners.nl\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/datasciencepartners.nl\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/datasciencepartners.nl\/wp-json\/wp\/v2\/comments?post=20157"}],"version-history":[{"count":5,"href":"https:\/\/datasciencepartners.nl\/wp-json\/wp\/v2\/posts\/20157\/revisions"}],"predecessor-version":[{"id":20237,"href":"https:\/\/datasciencepartners.nl\/wp-json\/wp\/v2\/posts\/20157\/revisions\/20237"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/datasciencepartners.nl\/wp-json\/wp\/v2\/media\/20159"}],"wp:attachment":[{"href":"https:\/\/datasciencepartners.nl\/wp-json\/wp\/v2\/media?parent=20157"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/datasciencepartners.nl\/wp-json\/wp\/v2\/categories?post=20157"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/datasciencepartners.nl\/wp-json\/wp\/v2\/tags?post=20157"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}