{"id":1951,"date":"2014-02-02T11:00:44","date_gmt":"2014-02-02T16:00:44","guid":{"rendered":"http:\/\/sqlity.net\/en\/?p=1951"},"modified":"2014-11-13T13:18:52","modified_gmt":"2014-11-13T18:18:52","slug":"revoke-undoing-granted-permissions","status":"publish","type":"post","link":"https:\/\/sqlity.net\/en\/1951\/revoke-undoing-granted-permissions\/","title":{"rendered":"REVOKE: How to Undo Granted Permissions"},"content":{"rendered":"
\n

Introduction<\/h3>\n

\nOver the last days we have been learning about the GRANT<\/span><\/a> statement. Today we are going to investigate, what we can do to remove a privilege that had been granted before.\n<\/p>\n

\nThe REVOKE<\/span> statement does exactly what we are looking for: It removes an existing permission. Let's look at an example.\n<\/p>\n

REVOKE Example<\/h3>\n

\nFirst we need a table to grant a permission on and a user to grant the permission to:\n<\/p>\n

\n[sql]\nCREATE LOGIN TestLogin1 WITH PASSWORD='********', CHECK_POLICY = OFF;
\nCREATE USER TestUser1 FOR LOGIN TestLogin1;
\nGO
\nCREATE TABLE dbo.tst1(id INT, col1 INT);
\nINSERT INTO dbo.tst1 VALUES(42, 1);
\n[\/sql]\n<\/div>\n

\nWith those two in place, we can grant a simple SELECT<\/span> privilege on dbo.tst<\/span> to TestUser1<\/span>.\n<\/p>\n

\n[sql]\nGRANT SELECT ON OBJECT::dbo.tst1 TO TestUser1;
\n[\/sql]\n<\/div>\n

\nIf you need a refresher on the GRANT<\/span> statement, check out How to GRANT Permissions in T-SQL<\/a>.\n<\/p>\n

\nWith that permission in place, TestUser<\/span> can now SELECT<\/span> from dbo.tst<\/span>:\n<\/p>\n

\n\"SELECT<\/a>\n<\/p>\n

\nNow, if we decide that TestUser1<\/span> should not have SELECT<\/span> access to our table anymore, we can use the REVOKE<\/span> statement. The syntax of the REVOKE<\/span> statement is very similar to the one of the GRANT<\/span> statement:\n<\/p>\n

\n[sql]\nREVOKE SELECT ON OBJECT::dbo.tst1 FROM TestUser1;
\n[\/sql]\n<\/div>\n

\nThe only real difference to the GRANT<\/span> statement is the keyword FROM<\/span> instead of TO<\/span> in front of the grantee. However, even though it does not follow proper English grammar, SQL Server does allow TO<\/span> to be used instead of FROM<\/span> like this:\n<\/p>\n

\n[sql]\nREVOKE SELECT ON OBJECT::dbo.tst1 TO TestUser1;
\n[\/sql]\n<\/div>\n

\nThat syntax from, while it does look a little odd, makes automatically generating scripts a little easier.\n<\/p>\n

\nThe REVOKE<\/span> statement causes a previously granted identical privilege to be revoked. It works only on the same privilege on the same securable for the same grantee. Revoking for example an UPDATE<\/span> privilege does not have any effect on an existing SELECT<\/span> or INSERT<\/span> permission.\n<\/p>\n

\nAfter executing the above REVOKE<\/span> statement, TestUser1<\/span> does not have access to dbo.tst1<\/span> anymore:\n<\/p>\n

\n\"SELECT<\/a>\n<\/p>\n

Summary<\/h3>\n

\nThe REVOKE<\/span> statement can be used to undo the action of a GRANT<\/span> statement. It revokes a privilege from a grantee, but only if that exact privilege was granted to the same grantee before.\n<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

If you have a security principal with a specific permission and you want to remove that permission from that principal, you can use the REVOKE statement. Read on to get all the details on how to use it.<\/p>\n

[more…]<\/a><\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[5,34],"tags":[88,50,98,38,58,15],"class_list":["post-1951","post","type-post","status-publish","format-standard","hentry","category-general","category-security","tag-grant","tag-permission","tag-revoke","tag-security-2","tag-security-management","tag-sql-server"],"acf":[],"yoast_head":"\nREVOKE: How to Undo Granted Permissions - sqlity.net<\/title>\n<meta name=\"description\" content=\"If you want to remove an existing permission in SQL Server you can use the REVOKE statement. 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