SnowConvert AI - Teradata

What is SnowConvert AI for Teradata?

SnowConvert AI is a software that understands Teradata SQL (https://www.teradata.com/), BTEQ, and other Teradata-specific scripts (such as Fastload, Multiload, TPump, and TPT files) and converts this source code into functionally equivalent Snowflake code.

转换类型

Specifically, SnowConvert AI for Teradata performs the following conversions:

Teradata SQL 至 Snowflake SQL

SnowConvert AI understands the Teradata source code and converts the Data Definition Language (DDL), Data Manipulation Language (DML), and functions in the source code to the corresponding SQL in the target: Snowflake. SnowConvert AI can migrate the source code in any of these three extensions .sql, .dml, ddl

Teradata 存储过程至嵌入 Snowflake SQL 中的 JavaScript

SnowConvert AI takes Teradata stored procedures (usually written in SQL) and converts them to JavaScript embedded into Snowflake SQL. Teradata's CREATE PROCEDURE and REPLACE PROCEDURE language is replaced by Snowflake's CREATE OR REPLACE PROCEDURE language. JavaScript is called as a scripting language, and all of the inner statements are converted to JavaScript.

Teradata BTEQ、Fastload、Multiload 和 TPT 至 Python

Basic Teradata Query (BTEQ) is Teradata's proprietary scripting language. All BTEQ script files will be converted to Python scripts. A helper class will be called from the converted scripts to create the functional equivalence between the source and the target. More information about the Python Helpers can be found on our Translation Reference page. BTEQ can be batch run from outside the Snowflake environment. Learn more about how you can connect Python scripts directly to Snowflake.

BTEQ 文件也是 Teradata 创建的其他多种专有数据类型的基础：

  • Fastload

  • Multiload

  • TPUMP

Each one of these file types are extensions of BTEQ. SnowConvert AI translates each one of these file types to Python.

Each of these conversions are optimized to give you the most functionally equivalent output ready for use in Snowflake. For more information on the power of the kind of conversion SnowConvert AI can provide, you can learn more about our tool by visiting our complete SQL reference guide.

SnowConvert AI Terminology

为了确保我们在深入探讨代码转换的奇妙之处之前达成共识，以下是一些关键术语的定义说明，这样当我们在文档中频繁使用这些术语时，您能准确理解它们的含义：

  • SQL (Structured Query Language): 大多数现代数据库架构中用于存储、操作和检索数据的标准语言。

  • BTEQ (Basic Teradata Query): BTEQ was the first utility and query tool for Teradata.

  • TPT (Teradata Parallel Transporter)：TPT 是新一代实用工具，旨在为与从/向 Teradata 数据库加载和导出数据有关的所有活动创建一站式工具。

  • SnowConvert AI: the software that converts securely and automatically your Teradata files to the Snowflake cloud data platform.

  • Conversion rule or transformation rule: rules that allow SnowConvert AI to convert from a portion of source code to the expected target code.

  • Parse: parse or parsing is an initial process done by SnowConvert AI to understand the source code and build up an internal data structure to process the conversion rules.

On the next few pages, you'll learn more about the kind of conversions that SnowConvert AI for Teradata is capable of. If you're ready to get started, visit the Getting Started page in this documentation. If you're interested in getting more information about SnowConvert AI in general, visit our SnowConvert AI for Teradata information page.

转换示例

Teradata SQL 语句

-- CREATE TABLE DDL
CREATE SET TABLE TABLE1,
    NO BEFORE JOURNAL,
    NO AFTER JOURNAL,
    CHECKSUM = DEFAULT,
    DEFAULT MERGEBLOCKRATIO
(
    COL1 VARCHAR(15) CHARACTER SET LATIN NOT CASESPECIFIC,
    Col2 BYTEINT CHECK ( CurrentFlag  IN (0 ,1 ) ) NOT NULL,
    COL3 DATE FORMAT 'yyyy-mm-dd',
    COL4 BLOB(2097088000),
    COL5 BYTEINT,
    COL7 INTEGER NOT NULL COMPRESS (1 ,2 ,3 ,4),
    COL8 INTERVAL HOUR(2) TO MINUTE
);

-- REPLACE VIEW DDL
REPLACE VIEW VIEW1 AS
SELECT * FROM TABLE1
UNION ALL
SELECT MAX(COL1) FROM TABLE1;
Copy

转换后的 SQL 代码：

-- CREATE TABLE DDL
--** SSC-FDM-TD0024 - SET TABLE FUNCTIONALITY NOT SUPPORTED. TABLE MIGHT HAVE DUPLICATE ROWS **
CREATE OR REPLACE TABLE TABLE1
(
    COL1 VARCHAR(15) COLLATE 'en-cs',
    Col2 BYTEINT
                 !!!RESOLVE EWI!!! /*** SSC-EWI-0035 - CHECK STATEMENT NOT SUPPORTED ***/!!!
 CHECK ( CurrentFlag  IN (0 ,1 ) ) NOT NULL,
    COL3 DATE,
    COL4 BINARY /*** SSC-FDM-TD0001 - COLUMN CONVERTED FROM BLOB DATA TYPE ***/,
    COL5 BYTEINT,
    COL7 INTEGER NOT NULL,
    COL8 VARCHAR(21) !!!RESOLVE EWI!!! /*** SSC-EWI-0036 - INTERVAL HOUR(2) TO MINUTE DATA TYPE CONVERTED TO VARCHAR ***/!!!
)
COMMENT = '{"origin":"sf_sc","name":"snowconvert","version":{"major":1, "minor":0},"attributes":{"component":"teradata"}}'
;

-- REPLACE VIEW DDL
CREATE OR REPLACE VIEW VIEW1
COMMENT = '{"origin":"sf_sc","name":"snowconvert","version":{"major":1, "minor":0},"attributes":{"component":"teradata"}}'
AS
SELECT
    * FROM
    TABLE1
    UNION ALL
    SELECT
    MAX(COL1) FROM
    TABLE1;
Copy

在此转换后的 SQL 中，您会注意到我们进行了多方面的转换，例如：

  • 如果用户未指定 PUBLIC 架构，则默认为所有表和视图名称添加架构（请参阅“如何指定架构”）。

  • CREATE SET TABLE 至 CREATE TABLE

  • REPLACE VIEW 至 CREATE OR REPLACE VIEW

  • 数据类型：BLOB 至 BINARY 和 INTERVAL 至 VARCHAR

  • 数据类型属性：NOT CASESPECIFIC 至 COLLATE

  • 移除由于 Snowflake 的架构而在 Snowflake 中不需要的 Teradata SQL 片段，例如 NO BEFORE JOURNAL、NO AFTER JOURNAL、CHECKSUM、COMPRESS 和 DEFAULT MERGEBLOCKRATIO。

语言: 中文