Tables

Translation reference to convert Teradata TABLE statement to Snowflake

Some parts in the output code are omitted for clarity reasons.

Description

Teradata's TABLE statement is translated to Snowflake TABLE syntax.

For more information on Teradata TABLEs, check here.

Sample Source Patterns

Simple Create​ Table

Teradata

Table

IN -> Teradata_01.sql

CREATE TABLE table1, no fallback,
no before journal,
no after journal (
  c1 INTEGER NOT NULL,
	f1 INTEGER NOT NULL,
	p1 INTEGER NOT NULL,
  DATE,
  TIME,
	FOREIGN KEY(f1) REFERENCES WITH CHECK OPTION table2 (d1)
)
UNIQUE PRIMARY INDEX(c1)
PARTITION BY COLUMN(p1);

Snowflake

Table

OUT -> Teradata_01.sql

CREATE OR REPLACE TABLE table1 (
	c1 INTEGER NOT NULL,
	f1 INTEGER NOT NULL,
	p1 INTEGER NOT NULL,
	DATE,
	TIME,
	FOREIGN KEY(f1) REFERENCES table2 (d1) ,
	UNIQUE (c1)
)
--** SSC-PRF-0007 - PERFORMANCE REVIEW - CLUSTER BY **
CLUSTER BY (p1)
COMMENT = '{"origin":"sf_sc","name":"snowconvert","version":{"major":1, "minor":0},{"attributes":{"component":"teradata"}}'
;

Table Kind Clause - SET and MULTISET

Teradata's kind clause determines whether duplicate rows are permitted (MULTISET) or not (SET).

Teradata

Table

IN -> Teradata_02.sql

-- Set semantics
CREATE SET TABLE table1 (
    column1 INTEGER
);

--Multiset semantics
CREATE MULTISET TABLE table2(
    column1 INTEGER
);

Snowflake

Table

OUT -> Teradata_02.sql

-- Set semantics
--** SSC-FDM-TD0024 - SET TABLE FUNCTIONALITY NOT SUPPORTED. TABLE MIGHT HAVE DUPLICATE ROWS **
CREATE OR REPLACE TABLE table1 (
    column1 INTEGER
)
COMMENT = '{"origin":"sf_sc","name":"snowconvert","version":{"major":1, "minor":0},{"attributes":{"component":"teradata"}}'
;

--Multiset semantics
CREATE OR REPLACE TABLE table2 (
    column1 INTEGER
)
COMMENT = '{"origin":"sf_sc","name":"snowconvert","version":{"major":1, "minor":0},{"attributes":{"component":"teradata"}}'
;

Volatile and Global Temporary Tables

Teradata's Volatile and Global Temporary tables are used for the temporary storage of data. Their difference lies in that the table definition (DDL) of Global Temporary tables is persisted in the Data Dictionary, while Volatile tables definition is not stored.

Teradata

Table

IN -> Teradata_03.sql

--Global Temporary Table
CREATE MULTISET GLOBAL TEMPORARY TABLE table1 (
    column1 INTEGER
);

--Volatile Table
CREATE MULTISET VOLATILE TABLE table3 (
    column1 INTEGER
);

Snowflake

Table

OUT -> Teradata_03.sql

--Global Temporary Table
--** SSC-FDM-0009 - GLOBAL TEMPORARY TABLE FUNCTIONALITY NOT SUPPORTED. **
CREATE OR REPLACE TABLE table1 (
    column1 INTEGER
)
COMMENT = '{"origin":"sf_sc","name":"snowconvert","version":{"major":1, "minor":0},{"attributes":{"component":"teradata"}}'
;

--Volatile Table
CREATE OR REPLACE TEMPORARY TABLE table3 (
    column1 INTEGER
)
COMMENT = '{"origin":"sf_sc","name":"snowconvert","version":{"major":1, "minor":0},{"attributes":{"component":"teradata"}}'
;

With data and with no data option

Teradata

Table

IN -> Teradata_04.sql

-- With data
CREATE TABLE table1 AS table2 WITH DATA

-- With no data
CREATE TABLE table1 AS table2 WITH NO DATA 

Snowflake

Table

OUT -> Teradata_04.sql

-- With data
CREATE OR REPLACE TABLE table1 CLONE table2
COMMENT = '{"origin":"sf_sc","name":"snowconvert","version":{"major":1, "minor":0},{"attributes":{"component":"teradata"}}'
;

-- With no data