Snowflake COPY INTO Command for Data Transformation

Questions and Answers

What feature in Snowflake helps avoid the use of temporary tables for storing pre-transformed data?

Bulk loading

Data staging

Column reordering

COPY INTO command (correct)

When parsing a staged data file in Snowflake, what is the default field delimiter?

Pipe character (|)

Tab character

Semicolon (;)

Comma character (,) (correct)

Which option is ignored when querying staged data files in Snowflake?

Field delimiter definition

Record delimiter definition

ERROR_ON_COLUMN_COUNT_MISMATCH (correct)

Data file format type

How should JSON data files be structured when transforming them during a load operation in Snowflake?

NDJSON format Signup and view all the answers

Which transformations can be applied to data during loading into a table using the COPY INTO command in Snowflake?

Column reordering, column omission, casts Signup and view all the answers

What is the default format for staged data files in Snowflake?

Character-delimited UTF-8 text Signup and view all the answers

What is one way to set file format options in Snowflake?

Querying staged data files using a SELECT statement Signup and view all the answers

Which function is explicitly mentioned as not applying certain file format options in Snowflake COPY transformations?

VALIDATE Signup and view all the answers

In Snowflake, which keyword should not be specified to prevent inconsistent ON_ERROR copy option behavior?

DISTINCT Signup and view all the answers

What is one limitation of Scalar SQL UDFs in Snowflake regarding data transformation error handling?

Inconsistent or unexpected ON_ERROR copy option behavior Signup and view all the answers

Which functionality is not supported when loading a subset of data into a table in Snowflake?

Using the WHERE clause for filtering Signup and view all the answers

What happens when the VALIDATION_MODE parameter is specified for COPY statements that transform data during a load in Snowflake?

Unexpected ON_ERROR copy option behavior occurs Signup and view all the answers

Study Notes

Snowflake Features and Load Operations

Snowflake's pipelined feature helps avoid the use of temporary tables for storing pre-transformed data.

Staged Data Files in Snowflake

The default field delimiter when parsing a staged data file in Snowflake is comma (,**) .
The HEADER option is ignored when querying staged data files in Snowflake.

JSON Data Files in Snowflake

JSON data files should be structured as NDJSON (Newline Delimited JSON) when transforming them during a load operation in Snowflake.

Data Transformations in Snowflake

The following transformations can be applied to data during loading into a table using the COPY INTO command in Snowflake: data conversion, data validation, and data transformation.

File Format Options in Snowflake

The default format for staged data files in Snowflake is CSV.
File format options can be set in Snowflake using the FILE_FORMAT parameter.
The PARSE_JSON function does not apply certain file format options in Snowflake COPY transformations.

COPY INTO Command in Snowflake

The ON_ERROR keyword should not be specified to prevent inconsistent ON_ERROR copy option behavior in Snowflake.
When the VALIDATION_MODE parameter is specified for COPY statements that transform data during a load in Snowflake, it enables data validation.

Scalar SQL UDFs in Snowflake

One limitation of Scalar SQL UDFs in Snowflake regarding data transformation error handling is that they cannot propagate errors.

Loading Data into a Table in Snowflake

Filtering is not supported when loading a subset of data into a table in Snowflake.

Description

Learn about how Snowflake's COPY INTO command simplifies ETL pipelines by allowing for data transformation during the loading process. This feature eliminates the need for temporary tables and enables actions like column reordering, omission, and data type casting.