SnowConvert AI: Power BI Teradata Repointing¶

Description¶

The Power BI repointing is a feature that provides an easy way to redefine the connections from the M language in the Power Query Editor. This means that the connection parameters will be redefined to point to the Snowflake migration database context. For Teradata, the method in M Language that defined the connection is Teradata.Database(...). In Snowflake, there is a connector that depends on some other parameters and the main connection is defined by Snowflake.Database(...) method. In addition, there is a limited support to ODBC.Query connector only for Teradata as a source languge in the migration. This means that the source connection parameters (of Teradata connections) will be redefine to point to the Snowflake migration database context.

Source Pattern Samples¶

Entity Repointing Case: Table¶

This case refers to connections that do not contain embedded SQL. This means that the user has established a connection from Power BI to a table.

Teradata Connection in the Power Query Editor

let
    Source = Teradata.Database("the_teradata_server", [HierarchicalNavigation=true]),
    databaseTest = Source{[Schema="databaseTest"]}[Data],
    employees1 = databaseTest{[Name="employees"]}[Data]
in
    employees1
Copy

Snowflake Connection in the Power Query Editor

let
    Source = Snowflake.Databases(SF_SERVER_LINK, SF_WAREHOUSE_NAME),
    SourceSfDb = Source{[Name=SF_DB_NAME, Kind="Database"]}[Data],
    SourceSfSchema = SourceSfDb{[Name="databaseTest", Kind="Schema"]}[Data],
    SourceSfTbl = SourceSfSchema{[Name="EMPLOYEES", Kind="Table"]}[Data],
    Employees1 = Table.RenameColumns(SourceSfTbl, {{ "EMPLOYEEID", "EmployeeID"}, { "FIRSTNAME", "FirstName"}, { "LASTNAME", "LastName"}, { "HIREDATE", "HireDate"}, { "SALARY", "Salary"}, { "DEPARTMENTID", "DepartmentID"}})
in
    Employees1
Copy

Entity Repointing Case: View¶

This case refers to connections that do not contain embedded SQL. This means that the user has established a connection from Power BI to a view.

Teradata Connection in the Power Query Editor

let
    Source = Teradata.Database("the_teradata_server", [HierarchicalNavigation=true]),
    databaseTest = Source{[Schema="databaseTest"]}[Data],
    EmployeeSalaryBonusView1 = databaseTest{[Name="EmployeeSalaryBonusView"]}[Data]
in
    EmployeeSalaryBonusView1
Copy

Snowflake Connection in the Power Query Editor

let
    Source = Snowflake.Databases(SF_SERVER_LINK, SF_WAREHOUSE_NAME),
    SourceSfDb = Source{[Name=SF_DB_NAME, Kind="Database"]}[Data],
    SourceSfSchema = SourceSfDb{[Name="databaseTest", Kind="Schema"]}[Data],
    SourceSfTbl = SourceSfSchema{[Name="EMPLOYEESALARYBONUSVIEW", Kind="Table"]}[Data],
    EmployeeSalaryBonusView1 = Table.RenameColumns(SourceSfTbl, {{ "FIRSTNAME", "FirstName"}, { "LASTNAME", "LastName"}, { "HIREDATE", "HireDate"}})
in
    EmployeeSalaryBonusView1
Copy

Embedded SQL Case¶

This case refers to connections that contains embedded SQL inside of them. This sample show a simple query but SnowConvert AI covers a range of more larger scenarios. Besides, there may be warning messages knows as EWI- PRF - FDM depending on the migrated query. This will help the user identifies patterns that needs extra attention.

Teradata Connection in the Power Query Editor

let
    Source = Teradata.Database("the_teradata_server", [HierarchicalNavigation=true, Query="SELECT *#(lf)FROM databaseTest.employees"])
in
    Source
Copy

Snowflake Connection in the Power Query Editor

let
    SfSource = Value.NativeQuery(Snowflake.Databases(SF_SERVER_LINK,SF_WAREHOUSE_NAME,[Implementation="2.0"]){[Name=SF_DB_NAME]}[Data], "SELECT * FROM databaseTest.employees", null, [EnableFolding=true]),
    Source = Table.RenameColumns(SfSource, {{ "EMPLOYEEID", "EmployeeID"}, { "FIRSTNAME", "FirstName"}, { "LASTNAME", "LastName"}, { "HIREDATE", "HireDate"}, { "SALARY", "Salary"}, { "DEPARTMENTID", "DepartmentID"}})
in
    Source
Copy

ODBC.Query Case¶

At the moment it is supported only ODBC.Query connector. Other connectors as ODBC.DataSource are not supported.

This case refers to connections that contains embedded SQL inside of an ODBC.Query connector. Notice that all connections with ODBC.Query will be taken as Teradata source when migrating Teradata. Please, be aware of your report connection definitions.

Teradata Connection in the Power Query Editor

let
  Source = Odbc.Query("dsn=TERADATA_TEST", "SELECT * FROM TEST_TABLE")
in
  Source
Copy

Snowflake Connection in the Power Query Editor

let
   Source = Value.NativeQuery(Snowflake.Databases(SF_SERVER_LINK,SF_WAREHOUSE_NAME,[Implementation="2.0"]){[Name=SF_DB_NAME]}[Data], "SELECT * FROM TEST_TABLE", null, [EnableFolding=true])
in
   Source
Copy
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