{"id":319,"date":"2023-12-09T15:57:29","date_gmt":"2023-12-09T15:57:29","guid":{"rendered":"https:\/\/kourentzes.com\/konstantinos\/?p=319"},"modified":"2023-12-09T15:57:29","modified_gmt":"2023-12-09T15:57:29","slug":"t-sql-udf-isnumber","status":"publish","type":"post","link":"https:\/\/kourentzes.com\/konstantinos\/index.php\/2023\/12\/09\/t-sql-udf-isnumber\/","title":{"rendered":"T-SQL UDF IsNumber"},"content":{"rendered":"\n<p>This is for older SQL versions, for everything else use isnumeric().<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono\" style=\"font-size:.875rem;font-family:Code-Pro-JetBrains-Mono,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:1.25rem;--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:block;padding:16px 0 0 16px;margin-bottom:-1px;width:100%;text-align:left;background-color:#212121\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"54\" height=\"14\" viewBox=\"0 0 54 14\"><g fill=\"none\" fill-rule=\"evenodd\" transform=\"translate(1 1)\"><circle cx=\"6\" cy=\"6\" r=\"6\" fill=\"#FF5F56\" stroke=\"#E0443E\" stroke-width=\".5\"><\/circle><circle cx=\"26\" cy=\"6\" r=\"6\" fill=\"#FFBD2E\" stroke=\"#DEA123\" stroke-width=\".5\"><\/circle><circle cx=\"46\" cy=\"6\" r=\"6\" fill=\"#27C93F\" stroke=\"#1AAB29\" stroke-width=\".5\"><\/circle><\/g><\/svg><\/span><span role=\"button\" tabindex=\"0\" data-code=\"CREATE FUNCTION dbo.IsNumber \n(@Value NVARCHAR(4000))\nRETURNS BIT\nAS\nBEGIN\n    -- Check if the input is an integer, decimal, or money format\n    RETURN CASE \n        WHEN @Value IS NULL THEN 0\n        WHEN @Value LIKE '%[^0-9.-]%' THEN 0  -- Contains non-numeric characters\n        WHEN @Value LIKE '%.%.%' THEN 0      -- More than one decimal point\n        WHEN @Value = '.' THEN 0             -- Just a decimal point\n        WHEN @Value LIKE '-%' AND CHARINDEX('-', @Value) &gt; 1 THEN 0  -- '-' not at the start\n        WHEN @Value LIKE '%-%' THEN 0        -- Contains '-' not at the start\n        WHEN LEN(@Value) = 0 THEN 0          -- Empty string\n        ELSE 1\n    END\nEND\nGO\n\" style=\"color:#EEFFFF;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2m-6 9l2 2 4-4\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2\"><\/path><\/svg><\/span><pre class=\"shiki material-theme-darker\" style=\"background-color: #212121\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #F78C6C\">CREATE<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #F78C6C\">FUNCTION<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #82AAFF\">dbo<\/span><span style=\"color: #EEFFFF\">.IsNumber <\/span><\/span>\n<span class=\"line\"><span style=\"color: #EEFFFF\">(@Value <\/span><span style=\"color: #F78C6C\">NVARCHAR<\/span><span style=\"color: #EEFFFF\">(<\/span><span style=\"color: #F78C6C\">4000<\/span><span style=\"color: #EEFFFF\">))<\/span><\/span>\n<span class=\"line\"><span style=\"color: #F78C6C\">RETURNS<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #C792EA\">BIT<\/span><\/span>\n<span class=\"line\"><span style=\"color: #F78C6C\">AS<\/span><\/span>\n<span class=\"line\"><span style=\"color: #F78C6C\">BEGIN<\/span><\/span>\n<span class=\"line\"><span style=\"color: #89DDFF\">    <\/span><span style=\"color: #545454; font-style: italic\">-- Check if the input is an integer, decimal, or money format<\/span><\/span>\n<span class=\"line\"><span style=\"color: #EEFFFF\">    <\/span><span style=\"color: #F78C6C\">RETURN<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #F78C6C\">CASE<\/span><span style=\"color: #EEFFFF\"> <\/span><\/span>\n<span class=\"line\"><span style=\"color: #EEFFFF\">        <\/span><span style=\"color: #F78C6C\">WHEN<\/span><span style=\"color: #EEFFFF\"> @Value <\/span><span style=\"color: #F78C6C\">IS<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #F78C6C\">NULL<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #F78C6C\">THEN<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #F78C6C\">0<\/span><\/span>\n<span class=\"line\"><span style=\"color: #EEFFFF\">        <\/span><span style=\"color: #F78C6C\">WHEN<\/span><span style=\"color: #EEFFFF\"> @Value <\/span><span style=\"color: #F78C6C\">LIKE<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #C3E88D\">%[^0-9.-]%<\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #F78C6C\">THEN<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #F78C6C\">0<\/span><span style=\"color: #EEFFFF\">  <\/span><span style=\"color: #545454; font-style: italic\">-- Contains non-numeric characters<\/span><\/span>\n<span class=\"line\"><span style=\"color: #EEFFFF\">        <\/span><span style=\"color: #F78C6C\">WHEN<\/span><span style=\"color: #EEFFFF\"> @Value <\/span><span style=\"color: #F78C6C\">LIKE<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #C3E88D\">%.%.%<\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #F78C6C\">THEN<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #F78C6C\">0<\/span><span style=\"color: #EEFFFF\">      <\/span><span style=\"color: #545454; font-style: italic\">-- More than one decimal point<\/span><\/span>\n<span class=\"line\"><span style=\"color: #EEFFFF\">        <\/span><span style=\"color: #F78C6C\">WHEN<\/span><span style=\"color: #EEFFFF\"> @Value <\/span><span style=\"color: #89DDFF\">=<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #C3E88D\">.<\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #F78C6C\">THEN<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #F78C6C\">0<\/span><span style=\"color: #EEFFFF\">             <\/span><span style=\"color: #545454; font-style: italic\">-- Just a decimal point<\/span><\/span>\n<span class=\"line\"><span style=\"color: #EEFFFF\">        <\/span><span style=\"color: #F78C6C\">WHEN<\/span><span style=\"color: #EEFFFF\"> @Value <\/span><span style=\"color: #F78C6C\">LIKE<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #C3E88D\">-%<\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #F78C6C\">AND<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #82AAFF\">CHARINDEX<\/span><span style=\"color: #EEFFFF\">(<\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #C3E88D\">-<\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #EEFFFF\">, @Value) <\/span><span style=\"color: #89DDFF\">&gt;<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #F78C6C\">1<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #F78C6C\">THEN<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #F78C6C\">0<\/span><span style=\"color: #EEFFFF\">  <\/span><span style=\"color: #545454; font-style: italic\">-- &#39;-&#39; not at the start<\/span><\/span>\n<span class=\"line\"><span style=\"color: #EEFFFF\">        <\/span><span style=\"color: #F78C6C\">WHEN<\/span><span style=\"color: #EEFFFF\"> @Value <\/span><span style=\"color: #F78C6C\">LIKE<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #C3E88D\">%-%<\/span><span style=\"color: #89DDFF\">&#39;<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #F78C6C\">THEN<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #F78C6C\">0<\/span><span style=\"color: #EEFFFF\">        <\/span><span style=\"color: #545454; font-style: italic\">-- Contains &#39;-&#39; not at the start<\/span><\/span>\n<span class=\"line\"><span style=\"color: #EEFFFF\">        <\/span><span style=\"color: #F78C6C\">WHEN<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #82AAFF\">LEN<\/span><span style=\"color: #EEFFFF\">(@Value) <\/span><span style=\"color: #89DDFF\">=<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #F78C6C\">0<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #F78C6C\">THEN<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #F78C6C\">0<\/span><span style=\"color: #EEFFFF\">          <\/span><span style=\"color: #545454; font-style: italic\">-- Empty string<\/span><\/span>\n<span class=\"line\"><span style=\"color: #EEFFFF\">        <\/span><span style=\"color: #F78C6C\">ELSE<\/span><span style=\"color: #EEFFFF\"> <\/span><span style=\"color: #F78C6C\">1<\/span><\/span>\n<span class=\"line\"><span style=\"color: #EEFFFF\">    <\/span><span style=\"color: #F78C6C\">END<\/span><\/span>\n<span class=\"line\"><span style=\"color: #F78C6C\">END<\/span><\/span>\n<span class=\"line\"><span style=\"color: #F78C6C\">GO<\/span><\/span>\n<span class=\"line\"><\/span><\/code><\/pre><\/div>\n","protected":false},"excerpt":{"rendered":"<p>This is for older SQL versions, for everything else use isnumeric().<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[10],"tags":[45,43,42],"class_list":["post-319","post","type-post","status-publish","format-standard","hentry","category-code-snipperts","tag-ms-sql-2","tag-sql","tag-t-sql"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>T-SQL UDF IsNumber - konstantinos.kourentzes.com<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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