Help Center/ GaussDB(DWS)/ More Documents/ Developer Guide (Kuala Lumpur Region)/ Data Migration/ Data Export/ Exporting ORC Data to MRS/ Exporting Data
Updated on 2022-08-16 GMT+08:00
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Exporting Data

Procedure

  1. Export data. 

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    INSERT INTO [Foreign table name] SELECT * FROM [Source table name];
    • Only a single internal table can be exported at a time. Multiple tables cannot be joined during export. Results of the aggregation, sort, subquery, and limit operations on a single table also cannot be exported.

Examples

  • Example 1: Export data from table product_info_output to a data file using the product_info_output_ext foreign table. 
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    INSERT INTO product_info_output_ext SELECT * FROM product_info_output;
    If information similar to the following is displayed, the data has been exported. 
    INSERT 0 10
  • Example 2: Export part of the data to a data file by specifying the filter condition WHERE product_price>500. 
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    INSERT INTO product_info_output_ext SELECT * FROM product_info_output WHERE product_price>500;

Data of a special type, such as RAW, is exported as a binary file, which cannot be recognized by the import tool. As a result, you need to use the RAWTOHEX() function to convert it to the hexadecimal format before export.