{"id":11218,"date":"2024-03-14T13:37:42","date_gmt":"2024-03-14T13:37:42","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-add-a-field-and-comment-in-db2\/"},"modified":"2025-08-04T09:02:01","modified_gmt":"2025-08-04T09:02:01","slug":"how-to-add-a-field-and-comment-in-db2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-add-a-field-and-comment-in-db2\/","title":{"rendered":"DB2 ALTER TABLE: Add Fields &#038; Comments"},"content":{"rendered":"<p>In DB2 database, you can use the ALTER TABLE statement to add columns and comments.<\/p>\n<p>For example, if a table named &#8220;employees&#8221; needs to add a new field called &#8220;salary&#8221; and provide a comment for this field, you can use the following SQL statement:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">ALTER<\/span> <span class=\"hljs-keyword\">TABLE<\/span> employees\r\n<span class=\"hljs-keyword\">ADD<\/span> <span class=\"hljs-keyword\">COLUMN<\/span> salary <span class=\"hljs-type\">DECIMAL<\/span>(<span class=\"hljs-number\">10<\/span>, <span class=\"hljs-number\">2<\/span>) <span class=\"hljs-keyword\">DEFAULT<\/span> <span class=\"hljs-number\">0<\/span>,\r\n<span class=\"hljs-keyword\">ADD<\/span> <span class=\"hljs-keyword\">COLUMN<\/span> comment <span class=\"hljs-type\">VARCHAR<\/span>(<span class=\"hljs-number\">100<\/span>);\r\n\r\nCOMMENT <span class=\"hljs-keyword\">ON<\/span> <span class=\"hljs-keyword\">COLUMN<\/span> employees.salary <span class=\"hljs-keyword\">IS<\/span> <span class=\"hljs-string\">'\u5458\u5de5\u5de5\u8d44'<\/span>;\r\nCOMMENT <span class=\"hljs-keyword\">ON<\/span> <span class=\"hljs-keyword\">COLUMN<\/span> employees.comment <span class=\"hljs-keyword\">IS<\/span> <span class=\"hljs-string\">'\u5907\u6ce8'<\/span>;\r\n<\/code><\/pre>\n<p>In the above code, we used the ALTER TABLE statement to add two new fields &#8220;salary&#8221; and &#8220;comment&#8221; to the &#8220;employees&#8221; table, and used the COMMENT ON COLUMN statement to add comments to these two fields.<\/p>\n<p>It&#8217;s important to note that the ALTER TABLE statement in DB2 may impact the performance of a table, especially when adding a new field to a large table. Therefore, it is recommended to backup data and create indexes before executing the ALTER TABLE statement to ensure data integrity and performance.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In DB2 database, you can use the ALTER TABLE statement to add columns and comments. For example, if a table named &#8220;employees&#8221; needs to add a new field called &#8220;salary&#8221; and provide a comment for this field, you can use the following SQL statement: ALTER TABLE employees ADD COLUMN salary DECIMAL(10, 2) DEFAULT 0, ADD [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[8328,820,513,935,125],"class_list":["post-11218","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-add-columns","tag-alter-table","tag-database-management","tag-db2","tag-sql"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>DB2 ALTER TABLE: Add Fields &amp; Comments - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn how to use DB2 ALTER TABLE to add columns with comments. 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