# Data Manipulation {#chapter-6-data-manipulation}

In this chapter, we introduce how to work with string objects, temporal objects, and null values in DolphinDB.

-   **[String Objects](../../Programming/DataManipulation/StringObjects/StringObjects.md)**  

-   **[Temporal Objects](../../Programming/DataManipulation/TemporalObjects/TemporalObjects.md)**  

-   **[Null Value Manipulation](../../Programming/DataManipulation/NullValueManipulation/NullValueManipulation.md)**  


**Parent topic:**[Programming Guide](../../Programming/programming_basics.md)

