{"id":1478,"date":"2012-07-09T21:53:53","date_gmt":"2012-07-10T02:53:53","guid":{"rendered":"http:\/\/www.dpriver.com\/blog\/?page_id=1478"},"modified":"2012-07-10T02:10:24","modified_gmt":"2012-07-10T07:10:24","slug":"oracle-sql-query-rewrite-nvl-function-to-union-all-statement","status":"publish","type":"page","link":"https:\/\/www.dpriver.com\/blog\/list-of-demos-illustrate-how-to-use-general-sql-parser\/oracle-sql-query-rewrite\/oracle-sql-query-rewrite-nvl-function-to-union-all-statement\/","title":{"rendered":"Oracle SQL Query rewrite: NVL function to UNION ALL statement"},"content":{"rendered":"<p>NVL function to UNION ALL statement<\/p>\n<p>NVL(A, B) means that If A is null then B or A. So, we can re-write NVL using UNION ALL and IS NOT NULL condition.<\/p>\n<p>This is an article of <a href=\"http:\/\/www.dpriver.com\/blog\/list-of-demos-illustrate-how-to-use-general-sql-parser\/oracle-sql-query-rewrite\/\">Oracle SQL Query rewrite serials<\/a>.<\/p>\n<p>Take this sql for example:<\/p>\n<pre>\r\nSELECT *\r\nFROM   fnd_concurrent_requests\r\nWHERE  NVL(request_date, closed_date) = :b1\r\nAND    status = 'E' ;\r\n<\/pre>\n<p>SQL will be translated into:<\/p>\n<pre>\r\nSELECT *\r\nFROM   fnd_concurrent_requests\r\nWHERE  request_date = :b1\r\n       AND request_date IS NOT NULL\r\n       AND status = 'E'\r\nUNION ALL\r\nSELECT *\r\nFROM   fnd_concurrent_requests\r\nWHERE  closed_date = :b1\r\n       AND request_date IS NULL\r\n       AND status = 'E' \r\n<\/pre>\n<p>Download this demo: <a href=\"http:\/\/www.dpriver.com\/gsp\/demos\/csharp\/sqlrewrite\/sqlrewrite.zip\">C# version<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>NVL function to UNION ALL statement NVL(A, B) means that If A is null then B or A. So, we can re-write NVL using UNION ALL and IS NOT NULL condition. This is an article of Oracle SQL Query rewrite serials. Take this sql for example: SELECT * FROM fnd_concurrent_requests WHERE NVL(request_date, closed_date) = :b1 AND status = &#8216;E&#8217; ; SQL will be translated into: SELECT * FROM fnd_concurrent_requests WHERE request_date = :b1 AND request_date IS NOT NULL AND status = &#8216;E&#8217; UNION ALL SELECT * FROM fnd_concurrent_requests WHERE closed_date = :b1 AND request_date IS NULL AND status = &#8216;E&#8217;\u2026<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1445,"menu_order":0,"comment_status":"closed","ping_status":"open","template":"gsp_feature_page_tt.php","meta":[],"blocksy_meta":{"styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":5}},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Help you to make better use of General SQL Parser<\/title>\n<meta name=\"description\" content=\"Oracle SQL Query rewrite: NVL function to UNION 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