{"id":657,"date":"2010-10-07T09:40:00","date_gmt":"2010-10-07T09:40:00","guid":{"rendered":"\/blogs\/paul\/post\/Programmatically-picking-apart-foreign-key-constraints.aspx"},"modified":"2010-10-07T09:40:00","modified_gmt":"2010-10-07T09:40:00","slug":"programmatically-picking-apart-foreign-key-constraints","status":"publish","type":"post","link":"https:\/\/www.sqlskills.com\/blogs\/paul\/programmatically-picking-apart-foreign-key-constraints\/","title":{"rendered":"Programmatically picking apart foreign-key constraints"},"content":{"rendered":"

\nAnother quickie today. Don't ask why, but this morning I was trying to programmatically work out which tables have foreign-key references to table Sales<\/font>, because they're preventing fast partition switching on table Sales<\/font>.<\/font>\n<\/p>\n

\nAfter more spelunking around I thought I had it with this code:<\/font>\n<\/p>\n

\n

\n\tSELECT <\/font>* <\/font>FROM <\/font>sys<\/font>.<\/font>all_objects<\/font>
\n\tWHERE<\/font> [type] <\/font>= <\/font>'F' <\/font>AND<\/font> [parent_object_id] <\/font>= <\/font>OBJECT_ID <\/font>(<\/font>'Sales');<\/font>
\n\tGO<\/font> <\/font>\n\t<\/p>\n<\/blockquote>\n

\nBut that gives me the foreign-key references FROM the Sales<\/font> table, not TO the Sales<\/font> table.<\/font>\n<\/p>\n

\nEventually I found the sys.foreign_key_columns<\/font> table which does the trick, using the following code:<\/font>\n<\/p>\n

\n

\n\tSELECT <\/font>OBJECT_NAME <\/font>(<\/font>[parent_object_id]<\/font>)<\/font> AS<\/font> 'Referencing Table'<\/font>, * <\/font>FROM <\/font>sys<\/font>.<\/font>foreign_key_columns<\/font>
\n\tWHERE <\/font>[referenced_object_id] <\/font>= <\/font>OBJECT_ID <\/font>(<\/font>'Sales'<\/font>);<\/font>
\n\tGO<\/font> <\/font>\n\t<\/p>\n<\/blockquote>\n

\nAnd it also gives me the column IDs in both tables involved in the constraint. <\/font>\n<\/p>\n

\nEnjoy!<\/font><\/p>\n","protected":false},"excerpt":{"rendered":"

Another quickie today. Don't ask why, but this morning I was trying to programmatically work out which tables have foreign-key references to table Sales, because they're preventing fast partition switching on table Sales. After more spelunking around I thought I had it with this code: SELECT * FROM sys.all_objects WHERE [type] = 'F' AND [parent_object_id] […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[28],"tags":[],"class_list":["post-657","post","type-post","status-publish","format-standard","hentry","category-constraints"],"yoast_head":"\nProgrammatically picking apart foreign-key constraints - Paul S. Randal<\/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:\/\/www.sqlskills.com\/blogs\/paul\/programmatically-picking-apart-foreign-key-constraints\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Programmatically picking apart foreign-key constraints - Paul S. Randal\" \/>\n<meta property=\"og:description\" content=\"Another quickie today. Don't ask why, but this morning I was trying to programmatically work out which tables have foreign-key references to table Sales, because they're preventing fast partition switching on table Sales. 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