Snowflake - Delete

Overview

You can use this Snap to execute a Snowflake SQL delete with the given properties.


Snowflake Delete Configuration

Prerequisites

You must have minimum permissions on the database to execute Snowflake Snaps. To understand if you already have them, you must retrieve the current set of permissions. The following commands enable you to retrieve those permissions: 

SHOW GRANTS ON DATABASE <database_name>
          SHOW GRANTS ON SCHEMA <schema_name>
          SHOW GRANTS TO USER <user_name>
Security Prererequisites
You must have the following permissions in your Snowflake account to execute this Snap:
  • Usage (DB and Schema): Privilege to use the database, role, and schema.
The following commands enable minimum privileges in the Snowflake console:
grant usage on database <database_name> to role <role_name>;
grant usage on schema <database_name>.<schema_name>;

Learn more about Snowflake privileges: Access Control Privileges.

Internal SQL Commands

This Snap uses the DELETE command internally. It enables deleting data from a table using an optional WHERE clause and/or additional tables.

Known Issues

Because of performance issues, all Snowflake Snaps now ignore the Cancel queued queries when pipeline is stopped or if it fails option for Manage Queued Queries, even when selected. Snaps behave as though the default Continue to execute queued queries when the Pipeline is stopped or if it fails option were selected.

Snap views

View Description Examples of upstream and downstream Snaps
Input The table name and the relevant delete condition for the table to be deleted.
Output The output document displays:
  • Information about the delete operation status.
  • Number of records deleted
Error

Error handling is a generic way to handle errors without losing data or failing the Snap execution. You can handle the errors that the Snap might encounter when running the pipeline by choosing one of the following options from the When errors occur list under the Views tab. The available options are:

  • Stop Pipeline Execution Stops the current pipeline execution when an error occurs.
  • Discard Error Data and Continue Ignores the error, discards that record, and continues with the remaining records.
  • Route Error Data to Error View Routes the error data to an error view without stopping the Snap execution.

Learn more about Error handling in Pipelines.

Snap settings

Legend:
  • Expression icon (): Allows using JavaScript syntax to access SnapLogic Expressions to set field values dynamically (if enabled). If disabled, you can provide a static value. Learn more.
  • SnapGPT (): Generates SnapLogic Expressions based on natural language using SnapGPT. Learn more.
  • Suggestion icon (): Populates a list of values dynamically based on your Snap configuration. You can select only one attribute at a time using the icon. Type into the field if it supports a comma-separated list of values.
  • Upload : Uploads files. Learn more.
Learn more about the icons in the Snap settings dialog.
Field / Field set Type Description
Label String Required. Specify a unique name for the Snap. Modify this to be more appropriate, especially if there are more than one of the same Snap in the pipeline.
Schema name String/Expression Required. Specify the database schema name. In case it is not defined, then the suggestion for the Table Name retrieves all tables names of all schemas. The property is suggestible and will retrieve available database schemas during suggest values.
Note: The values can be passed using the pipeline parameters but not the upstream parameter.

Default value: N/A

Example: Schema_demo
Table Name String/Suggestion Required. Specify the name of the table to execute delete operation.
Note:
  • The values can be passed using the pipeline parameters but not the upstream parameter.

Default value: N/A

Example: employees_table
Delete condition (deletes all records from table if left blank) String/Suggestion Specify the Snowflake SQL WHERE clause of the delete statement. The delete condition may also be passed via an upstream Snap or through the pipeline parameters.
Note: Specify a valid WHERE clause for the delete condition. If you leave this field blank, the Snap deletes all the records from the table.
Without using expressionsUsing expressions
  • "EMPNO=$EMPNO and ENAME=$EMPNAME"
  • email = $email
  • emp=$emp
  • "emp='" + $emp + "'"
  • "EMPNO=" + $EMPNO + " and ENAME='" + $EMPNAME+ "'"
Note: Using expressions that join strings together to create SQL queries or conditions has a potential SQL injection risk and is hence unsafe. Ensure that you understand all implications and risks involved before using concatenation of strings with '=' Expression enabled.
Number of retries Integer Specify the maximum number of attempts to be made to receive a response. The request is terminated if the attempts do not result in a response.
  • If the value is larger than 0, the Snap first downloads the target file into a temporary local file. If any error occurs during the download, the Snap waits for the time specified in the Retry interval and attempts to download the file again from the beginning. When the download is successful, the Snap streams the data from the temporary file to the downstream Pipeline. All temporary local files are deleted when they are no longer needed.

Minimum Value: 0

Note: Ensure that the local drive has sufficient free disk space to store the temporary local file.

Default value: 0

Example: 3
Retry interval (seconds) Integer Specify the time interval between two successive retry requests. A retry happens only when the previous attempt resulted in an exception.

Default value: 1

Example: 10
Manage Queued Queries Dropdown list

Default value: Select this property to decide whether the Snap should continue or cancel the execution of the queued Snowflake Execute SQL queries when you stop the pipeline.

Note: If you select Cancel queued queries when the pipeline is stopped or if it fails, then the read queries under execution are canceled, whereas the write type of queries under execution are not canceled. Snowflake internally determines which queries are safe to be canceled and cancels those queries.

Default value: Continue to execute queued queries when the Pipeline is stopped or if it fails

Example: Cancel queued queries when the pipeline is stopped or if it fails
Snap execution Dropdown list Choose one of the three modes in which the Snap executes.
Available options are:
  • Validate & Execute. Performs limited execution of the Snap and generates a data preview during pipeline validation. Subsequently, performs full execution of the Snap (unlimited records) during pipeline runtime.
  • Execute only. Performs full execution of the Snap during pipeline execution without generating preview data.
  • Disabled. Disables the Snap and all Snaps that are downstream from it.