{"id":7485,"date":"2024-03-14T05:35:24","date_gmt":"2024-03-14T05:35:24","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/what-are-the-update-rules-in-pgsql\/"},"modified":"2025-08-02T16:51:30","modified_gmt":"2025-08-02T16:51:30","slug":"what-are-the-update-rules-in-pgsql","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/what-are-the-update-rules-in-pgsql\/","title":{"rendered":"PostgreSQL Update Rules Explained"},"content":{"rendered":"
    \n
  1. UPDATE statement: Use the UPDATE statement to modify data in a table by specifying the column to be updated and its new value.<\/li>\n
  2. Constraint: by defining constraints (such as primary keys, unique constraints, foreign key constraints, etc.), updating operations can be limited to ensure data integrity.<\/li>\n
  3. Trigger: A trigger can be activated when updating data, causing a series of actions to be executed.<\/li>\n
  4. View: When updating a view, one must adhere to the view’s update rules, which typically correspond to update operations on the base table.<\/li>\n
  5. Rule: A set of rules that can be executed during update operations, similar to triggers but more flexible.<\/li>\n
  6. With clause: Using the WITH clause in an UPDATE statement allows for specifying certain special options for the update operation, such as concurrency control.<\/li>\n
  7. Permission: When updating data, it is necessary to meet the corresponding permission requirements to ensure that only appropriate users can perform update operations.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

    UPDATE statement: Use the UPDATE statement to modify data in a table by specifying the column to be updated and its new value. Constraint: by defining constraints (such as primary keys, unique constraints, foreign key constraints, etc.), updating operations can be limited to ensure data integrity. Trigger: A trigger can be activated when updating data, […]<\/p>\n","protected":false},"author":14,"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":[2137,648,9590,3151,9591],"class_list":["post-7485","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-data-integrity","tag-database-triggers","tag-postgresql-updates","tag-sql-constraints","tag-view-update-rules"],"yoast_head":"\nPostgreSQL Update Rules Explained - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Master PostgreSQL update rules: statements, constraints, triggers & view rules. 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