{"id":150,"date":"2023-12-25T08:08:53","date_gmt":"2023-12-25T08:08:53","guid":{"rendered":"https:\/\/feellikelearning.com\/en\/?p=150"},"modified":"2023-12-25T08:08:53","modified_gmt":"2023-12-25T08:08:53","slug":"i-have-a-column-in-a-sqlite-table-it-is-a-json-array-how-can-i-select-unique-elements-in-the-column","status":"publish","type":"post","link":"https:\/\/feellikelearning.com\/en\/index.php\/2023\/12\/25\/i-have-a-column-in-a-sqlite-table-it-is-a-json-array-how-can-i-select-unique-elements-in-the-column\/","title":{"rendered":"I have a column in a SQLite table , it is a json array, how can I select unique elements in the column?"},"content":{"rendered":"\n<p>The values of the column like &#8220;[&#8216;a&#8217;, &#8216;b&#8217;]&#8221;, &#8220;[&#8216;a&#8217;]&#8221;,  &#8220;[&#8216;c&#8217;, &#8216;a&#8217;]&#8221;<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT DISTINCT value AS unique_element\nFROM your_table,\n     json_each(json_column);<\/code><\/pre>\n\n\n\n<p><code>json_each(json_column)<\/code>: This function is used to expand the JSON array into a set of key-value pairs, where the key is the index or key within the array, and the value is the corresponding element. So that for each record of you_table, it will expand to n records if json_column has n elements. To see the expansion<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT key, value, your_table.*\nFROM your_table,\n     json_each(json_column);<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>The values of the column like &#8220;[&#8216;a&#8217;, &#8216;b&#8217;]&#8221;, &#8220;[&#8216;a&#8217;]&#8221;, &#8220;[&#8216;c&#8217;, &#8216;a&#8217;]&#8221; json_each(json_column): This function is used to expand the JSON array into a set of key-value pairs, where the key is the index or key within the array, and the value is the corresponding element. So that for each record of you_table, it will expand [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-150","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>I have a column in a SQLite table , it is a json array, how can I select unique elements in the column? - Feel Like Learning<\/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:\/\/feellikelearning.com\/en\/index.php\/2023\/12\/25\/i-have-a-column-in-a-sqlite-table-it-is-a-json-array-how-can-i-select-unique-elements-in-the-column\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"I have a column in a SQLite table , it is a json array, how can I select unique elements in the column? - Feel Like Learning\" \/>\n<meta property=\"og:description\" content=\"The values of the column like &#8220;[&#8216;a&#8217;, &#8216;b&#8217;]&#8221;, &#8220;[&#8216;a&#8217;]&#8221;, &#8220;[&#8216;c&#8217;, &#8216;a&#8217;]&#8221; json_each(json_column): This function is used to expand the JSON array into a set of key-value pairs, where the key is the index or key within the array, and the value is the corresponding element. 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