{"id":383,"date":"2020-04-28T01:05:02","date_gmt":"2020-04-28T01:05:02","guid":{"rendered":"https:\/\/snowflake.pavlik.us\/?p=383"},"modified":"2020-04-28T01:15:24","modified_gmt":"2020-04-28T01:15:24","slug":"oracle-to-snowflake-table-ddl-conversion","status":"publish","type":"post","link":"https:\/\/snowflake.pavlik.us\/index.php\/2020\/04\/28\/oracle-to-snowflake-table-ddl-conversion\/","title":{"rendered":"Oracle to Snowflake Table DDL Conversion"},"content":{"rendered":"\n<p>Jason Trewin at <a rel=\"noreferrer noopener\" href=\"https:\/\/www.freshgravity.com\/\" target=\"_blank\">FreshGravity<\/a> provided this Oracle to Snowflake Table DDL conversion script. FreshGravity is a great Snowflake partner, and Jason is working on his second Snowflake deployment for our shared customers.<\/p>\n\n\n\n<p>He shared a great approach to DDL conversion from Oracle to Snowflake. I thought it was so useful that after some discussion he agreed to let me write up and post on it. <\/p>\n\n\n\n<p>You can modify the where clauses to select the tables you need to convert, and modify the mappings from Oracle table owners to Snowflake owners.<\/p>\n\n\n\n<p>Thanks and credit to Jason Trewin for contributing this useful script to the Snowflake community.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\n-- Script contributed to the Snowflake community courtesy of Jason Trewin at FreshGravity.\n\nSELECT &#039;CREATE OR REPLACE TABLE &#039;  \n        || NEW_SCHEMA_NAME\n        || &#039;.&#039; ||  TABLE_NAME || &#039; (&#039; || LISTAGG(COLUMN_NAME || &#039; &#039; || CONVERTED_DATA_TYPE || CASE WHEN NULLABLE = &#039;N&#039; THEN &#039; NOT NULL&#039; ELSE &#039;&#039;END , &#039; , &#039;) WITHIN GROUP (ORDER BY COLUMN_ID)  || &#039;);&#039; --AS COLUMN_LIST\n   FROM (      \n SELECT DATA_TYPE, COLUMN_NAME, ALL_TABLES.TABLE_NAME, ALL_TABLES.OWNER,DATA_LENGTH, DATA_PRECISION, DATA_SCALE, NULLABLE,\n        CASE WHEN INSTR(DATA_TYPE,&#039;WITH LOCAL TIME ZONE&#039;) &gt; 0  THEN &#039;TIMESTAMP_TZ&#039;\n             WHEN INSTR(DATA_TYPE,&#039;TIMESTAMP&#039;) &gt; 0 THEN &#039;TIMESTAMP_NTZ&#039;\n             WHEN DATA_TYPE = &#039;DATE&#039; THEN &#039;DATE&#039;\n             WHEN DATA_TYPE = &#039;XMLTYPE&#039; THEN &#039;VARIANT&#039;\n             WHEN DATA_TYPE IN (&#039;BINARY_DOUBLE&#039;,&#039;NUMBER&#039;) THEN &#039;NUMBER&#039;||\n                  CASE WHEN DATA_PRECISION IS NOT NULL THEN  &#039;(&#039;|| DATA_PRECISION || &#039;,&#039; || NVL(DATA_SCALE,0) || &#039;)&#039;\n                            ELSE &#039;&#039; END\n             WHEN DATA_TYPE IN (&#039;NVARCHAR2&#039;,&#039;VARCHAR2&#039;,&#039;VARCHAR&#039;,&#039;NVARCHAR&#039;) THEN &#039;TEXT(&#039; || DATA_LENGTH  || &#039;)&#039;\n             WHEN DATA_TYPE IN (&#039;NCHAR&#039;,&#039;CHAR&#039;) THEN &#039;TEXT(1)&#039;\n             WHEN DATA_TYPE = &#039;CLOB&#039; THEN &#039;TEXT(16777216)&#039;\n             ELSE NULL END AS CONVERTED_DATA_TYPE\n             ,CASE WHEN ALL_TABLES.OWNER = &#039;ORACLE_OWNER_1&#039; THEN &#039;SNOWFLAKE_OWNER_1&#039;  -- Map Oracle owners to Snowflake owners.\n                   WHEN ALL_TABLES.OWNER = &#039;ORACLE_OWNER_2&#039; THEN &#039;SNOWFLAKE_OWNER_2&#039;\n                   WHEN ALL_TABLES.OWNER = &#039;ORACLE_OWNER_3&#039; THEN &#039;SNOWFLAKE_OWNER_3&#039;                                      \n                   WHEN ALL_TABLES.OWNER = &#039;ORACLE_OWNER_4&#039; THEN &#039;SNOWFLAKE_OWNER_4&#039;\n\t\t\t\t   WHEN ALL_TABLES.OWNER = &#039;ORACLE_OWNER_5&#039; THEN &#039;SNOWFLAKE_OWNER_5&#039;  \n                   WHEN ALL_TABLES.OWNER = &#039;ORACLE_OWNER_6&#039; THEN &#039;SNOWFLAKE_OWNER_6&#039;                                      \n               ELSE NULL END AS NEW_SCHEMA_NAME\n             ,COLUMN_ID\n  FROM ALL_TAB_COLUMNS\n       INNER JOIN ALL_TABLES   \n          ON ALL_TABLES.TABLE_NAME  =  ALL_TAB_COLUMNS.TABLE_NAME\n         AND ALL_TABLES.OWNER       =  ALL_TAB_COLUMNS.OWNER\nWHERE\t-- Insert a where clause to decide which tables to include or exclude. This is just part of one approach: \n\tALL_TABLES.TABLE_NAME NOT IN (&#039;TABLE1&#039;,&#039;TABLE2&#039;,&#039;TABLE3&#039;)\n  )\nGROUP BY NEW_SCHEMA_NAME, TABLE_NAME\n\n\n\nSELECT TEXT_LINE FROM (\nSELECT 1 AS INDEXING_VALUE,\n     TABLE_NAME ,\n     OWNER,\n        &#039;CREATE OR REPLACE TABLE &#039;  \n        || CASE WHEN ALL_TABLES.OWNER = &#039;ORACLE_OWNER_1&#039; THEN &#039;SNOWFLAKE_OWNER_1&#039;  \t\t-- Map Oracle table ownwers to Snowflake table owners\n                WHEN ALL_TABLES.OWNER = &#039;ORACLE_OWNER_2&#039; THEN &#039;SNOWFLAKE_OWNER_2&#039;\n                WHEN ALL_TABLES.OWNER = &#039;ORACLE_OWNER_3&#039; THEN &#039;SNOWFLAKE_OWNER_3&#039;                                      \n                WHEN ALL_TABLES.OWNER = &#039;ORACLE_OWNER_4&#039; THEN &#039;SNOWFLAKE_OWNER_4&#039;\n                WHEN ALL_TABLES.OWNER = &#039;ORACLE_OWNER_5&#039; THEN &#039;SNOWFLAKE_OWNER_5&#039;  \n                WHEN ALL_TABLES.OWNER = &#039;ORACLE_OWNER_6&#039; THEN &#039;SNOWFLAKE_OWNER_6&#039;                                      \n           ELSE NULL END         || &#039;.&#039; ||  TABLE_NAME || &#039;(&#039; AS TEXT_LINE, 1 AS COLUMN_ID\n  FROM ALL_TABLES   \nWHERE ALL_TABLES.OWNER LIKE &#039;ORACLE_OWNER_%&#039;\t-- Set where condition for tables to process.\nAND ALL_TABLES.TABLE_NAME IN (&#039;TABLE1&#039;, &#039;TABLE2&#039;, &#039;TABLE3&#039;)\nUNION ALL\nSELECT 2  AS INDEXING_VALUE, ALL_TABLES.TABLE_NAME , ALL_TABLES.OWNER,\n        CASE WHEN COLUMN_ID = 1 THEN &#039;&#039; ELSE &#039;,&#039; END || COLUMN_NAME || &#039; &#039; ||\n            CASE WHEN INSTR(DATA_TYPE,&#039;WITH LOCAL TIME ZONE&#039;) &gt; 0  THEN &#039;TIMESTAMP_TZ&#039;\n             WHEN INSTR(DATA_TYPE,&#039;TIMESTAMP&#039;) &gt; 0 THEN &#039;TIMESTAMP_NTZ&#039;\n             WHEN DATA_TYPE = &#039;DATE&#039; THEN &#039;DATE&#039;\n             WHEN DATA_TYPE = &#039;XMLTYPE&#039; THEN &#039;VARIANT&#039;\n             WHEN DATA_TYPE IN (&#039;BINARY_DOUBLE&#039;,&#039;NUMBER&#039;) THEN &#039;NUMBER&#039;||\n                  CASE WHEN DATA_PRECISION IS NOT NULL THEN  &#039;(&#039;|| DATA_PRECISION || &#039;,&#039; || NVL(DATA_SCALE,0) || &#039;)&#039;\n                            ELSE &#039;&#039; END\n             WHEN DATA_TYPE IN (&#039;NVARCHAR2&#039;,&#039;VARCHAR2&#039;,&#039;VARCHAR&#039;,&#039;NVARCHAR&#039;) THEN &#039;TEXT(&#039; || DATA_LENGTH  || &#039;)&#039;\n             WHEN DATA_TYPE IN (&#039;NCHAR&#039;,&#039;CHAR&#039;) THEN &#039;TEXT(1)&#039;\n             WHEN DATA_TYPE = &#039;CLOB&#039; THEN &#039;TEXT(16777216)&#039;\n             ELSE NULL END ||  CASE WHEN NULLABLE = &#039;N&#039; THEN &#039; NOT NULL&#039; ELSE &#039;&#039;END  AS CONVERTED_DATA_TYPE\n           ,COLUMN_ID\n  FROM ALL_TAB_COLUMNS\n       INNER JOIN ALL_TABLES   \n          ON ALL_TABLES.TABLE_NAME  =  ALL_TAB_COLUMNS.TABLE_NAME\n         AND ALL_TABLES.OWNER       =  ALL_TAB_COLUMNS.OWNER\nWHERE ALL_TABLES.OWNER LIKE &#039;ODS_%&#039;\nAND ALL_TABLES.TABLE_NAME IN (&#039;TABLE1&#039;, &#039;TABLE2&#039;, &#039;TABLE3&#039;) \n UNION ALL SELECT 3 AS INDEXING_VALUE,\n     TABLE_NAME , OWNER,\n        &#039;);&#039;, 1 AS COLUMN_ID\n  FROM ALL_TABLES   \nWHERE ALL_TABLES.OWNER LIKE &#039;ORACLE_OWNER_%&#039;\nAND ALL_TABLES.TABLE_NAME IN (&#039;TABLE1&#039;, &#039;TABLE2&#039;, &#039;TABLE3&#039;)\n)\nORDER BY TABLE_NAME, OWNER, INDEXING_VALUE, COLUMN_ID\n\n\n\nSELECT  &#039;ALTER TABLE &#039;\n        || CASE WHEN ALL_TABLES.OWNER = &#039;ORACLE_OWNER_1&#039; THEN &#039;SNOWFLAKE_OWNER_1&#039;  \t\t-- Map Oracle table ownwers to Snowflake table owners\n                WHEN ALL_TABLES.OWNER = &#039;ORACLE_OWNER_2&#039; THEN &#039;SNOWFLAKE_OWNER_2&#039;\n                WHEN ALL_TABLES.OWNER = &#039;ORACLE_OWNER_3&#039; THEN &#039;SNOWFLAKE_OWNER_3&#039;                                      \n                WHEN ALL_TABLES.OWNER = &#039;ORACLE_OWNER_4&#039; THEN &#039;SNOWFLAKE_OWNER_4&#039;\n                WHEN ALL_TABLES.OWNER = &#039;ORACLE_OWNER_5&#039; THEN &#039;SNOWFLAKE_OWNER_5&#039;  \n                WHEN ALL_TABLES.OWNER = &#039;ORACLE_OWNER_6&#039; THEN &#039;SNOWFLAKE_OWNER_6&#039;                                       \n           ELSE NULL END         || &#039;.&#039; ||  TABLE_NAME\n        || &#039; ADD PRIMARY KEY (&#039; ||PK_COLUMMN_LIST || &#039;);&#039;\nFROM \n (\nSELECT --&#039;ALTER TABLE &#039; \n       COLS.OWNER, COLS.TABLE_NAME, LISTAGG(cols.COLUMN_NAME , &#039;,&#039;) WITHIN GROUP (ORDER BY POSITION) AS PK_COLUMMN_LIST\n--       cols.table_name, cols.column_name, cols.POSITION, cons.owner\nFROM all_constraints cons, all_cons_columns cols\nWHERE cols.OWNER LIKE &#039;ORACLE_OWNER_%&#039;\nAND cons.constraint_type = &#039;P&#039;\nAND cons.constraint_name = cols.constraint_name\nAND cons.owner = cols.owner\nGROUP BY  COLS.OWNER, COLS.TABLE_NAME\n)\n\n\n<\/pre><\/div>","protected":false},"excerpt":{"rendered":"<p>Jason Trewin at FreshGravity provided this Oracle to Snowflake Table DDL conversion script. FreshGravity is a great Snowflake partner, and Jason is working on his second Snowflake deployment for our shared customers. He shared a great approach to DDL conversion from Oracle to Snowflake. I thought it was so useful that after some discussion he [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[40,2,1],"tags":[38,37,21],"class_list":["post-383","post","type-post","status-publish","format-standard","hentry","category-ddl-conversion-sql","category-sql","category-uncategorized","tag-ddl-conversion","tag-oracle","tag-snowsql"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\r\n<title>Oracle to Snowflake Table DDL Conversion - Snowflake in the Carolinas<\/title>\r\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\r\n<link rel=\"canonical\" href=\"https:\/\/snowflake.pavlik.us\/index.php\/2020\/04\/28\/oracle-to-snowflake-table-ddl-conversion\/\" \/>\r\n<meta property=\"og:locale\" content=\"en_US\" \/>\r\n<meta property=\"og:type\" content=\"article\" \/>\r\n<meta property=\"og:title\" content=\"Oracle to Snowflake Table DDL Conversion - Snowflake in the Carolinas\" \/>\r\n<meta property=\"og:description\" content=\"Jason Trewin at FreshGravity provided this Oracle to Snowflake Table DDL conversion script. FreshGravity is a great Snowflake partner, and Jason is working on his second Snowflake deployment for our shared customers. He shared a great approach to DDL conversion from Oracle to Snowflake. 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