SSIS 面试题与答案
问题 11. What is the difference between a global variable and a package variable in SSIS?
Global variables are accessible throughout the entire SSIS project, while package variables are limited to the scope of a specific package. Global variables are defined at the project level.
问题 12. Explain the use of the SSIS Script Task.
The SSIS Script Task allows developers to write custom scripts in languages such as C# or VB.NET. It is used for advanced data transformations or tasks not achievable with built-in components.
问题 13. What is the purpose of the SSIS Lookup Transformation?
The SSIS Lookup Transformation is used to look up and retrieve data from a reference dataset based on a specified condition. It is commonly used for performing joins between datasets.
问题 14. Explain the term 'Slowly Changing Dimension' (SCD) in SSIS.
Slowly Changing Dimension (SCD) in SSIS refers to handling changes to dimension data over time. It involves identifying and updating the dimension data with historical changes.
问题 15. What is the purpose of the SSIS Derived Column Transformation?
The SSIS Derived Column Transformation is used to add, modify, or delete columns in the data flow. It allows the creation of new columns based on expressions or transformations of existing columns.
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