{"id":3273,"date":"2019-03-25T17:43:31","date_gmt":"2019-03-25T20:43:31","guid":{"rendered":"http:\/\/xexeu.elipse.com.br\/pt\/null-values-not-allowed-in-sql-fields\/"},"modified":"2019-07-05T16:52:12","modified_gmt":"2019-07-05T19:52:12","slug":"null-values-not-allowed-in-sql-fields","status":"publish","type":"post","link":"https:\/\/kb.elipse.com.br\/en\/null-values-not-allowed-in-sql-fields\/","title":{"rendered":"NULL values not allowed in SQL fields."},"content":{"rendered":"<div align=\"justify\">\n<p><b>Question:<\/b><\/p>\n<p>Why does a table generated inside SQL by E3 not allow writing NULL values in their fields, unlike Oracle?<\/p>\n<div align=\"center\"><img loading=\"lazy\" title=\"\" src=\"http:\/\/kb.elipse.com.br\/pt-br\/images\/ID4958\/AllowNullD.png\" alt=\"\" width=\"346\" height=\"126\" align=\"Baseline\" border=\"0\" \/><\/div>\n<p><b>Solution:<\/b><\/p>\n<p>First, you need to understand each database&#8217;s behavior when generating a table via E3:<\/p>\n<ul>\n<li><b>Oracle<\/b>: when creating a new table, or when inserting a new field into a pre-existing table, all fields (which aren&#8217;t &#8216;key&#8217;) allow NULL values.<\/li>\n<li><b>SQL Server<\/b>: when creating a new table, no NULL values are allowed by any fields. But when adding fields to a pre-existing table, these new fields will allow NULL values.<\/li>\n<li><b>Access<\/b>: when creating a new table, or when inserting a new field into a pre-existing table, no NULL values are allowed by any fields. NOTE: when a new filed is added to a pre-existing table, all records in that field start as NULL, but you can&#8217;t add new NULL records.<\/li>\n<\/ul>\n<p>Therefore, to have new NULL values be accepted by in the fields of an SQL field, you must generate a table with ordinary fields, so the field&#8217;s <b>Allow Nulls<\/b> option is disabled. After that, erase this field and insert the fields being used by E3, and then update the table by clicking the <b>Generate Table<\/b> option in the Historic. Once the table has been updated, check the fields: their <b>Allow Nulls<\/b> option will be enabled, therefore allowing you to write NULL values.<\/p>\n<div align=\"center\"><img loading=\"lazy\" title=\"\" src=\"http:\/\/kb.elipse.com.br\/pt-br\/images\/ID4958\/AllowNullH.png\" alt=\"\" width=\"368\" height=\"203\" align=\"Baseline\" border=\"0\" \/><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Question: Why does a table generated inside SQL by E3 not allow writing NULL values in their fields, unlike Oracle? Solution: First, you need to understand each database&#8217;s behavior when&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0},"categories":[735],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>NULL values not allowed in SQL fields. - Elipse Knowledgebase<\/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:\/\/kb.elipse.com.br\/en\/null-values-not-allowed-in-sql-fields\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"NULL values not allowed in SQL fields.\" \/>\n<meta property=\"og:description\" content=\"Question: Why does a table generated inside SQL by E3 not allow writing NULL values in their fields, unlike Oracle? 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