SSC-FDM-0001

Views selecting all columns from a single table are not required in Snowflake

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

Description

Views that only select all columns of a single table and do not have any filtering clauses are not required in Snowflake and may affect performance.

Code Example

Input Code (Oracle):

IN -> Oracle_01.sql

CREATE OR REPLACE VIEW simpleView1
AS
SELECT
*
FROM
simpleTable;

CREATE OR REPLACE VIEW simpleView2
AS
SELECT
*
FROM
simpleTable GROUP BY col1;

Output Code:

OUT -> Oracle_01.sql

CREATE OR REPLACE VIEW simpleView1
COMMENT = '{"origin":"sf_sc","name":"snowconvert","version":{"major":1, "minor":0},{"attributes":{"component":"oracle"}}'
AS
--** SSC-FDM-0001 - VIEWS SELECTING ALL COLUMNS FROM A SINGLE TABLE ARE NOT REQUIRED IN SNOWFLAKE AND MAY IMPACT PERFORMANCE. **
SELECT
*
FROM
simpleTable;

CREATE OR REPLACE VIEW simpleView2
COMMENT = '{"origin":"sf_sc","name":"snowconvert","version":{"major":1, "minor":0},{"attributes":{"component":"oracle"}}'
AS
--** SSC-FDM-0001 - VIEWS SELECTING ALL COLUMNS FROM A SINGLE TABLE ARE NOT REQUIRED IN SNOWFLAKE AND MAY IMPACT PERFORMANCE. **
SELECT
*
FROM
simpleTable
GROUP BY col1;

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