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  • How to merge data from older database to new database in postgresql?

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    If you want to merging data from older database to new database in PostgreSQL or want to merge data from other database(db1) to another database(db2), follow these below steps:

    1. from db1, export all the necessary tables to csv using:
    copy (select * from table_name) to E'C:\\Users\\dinesh\\Documents\\table_name.csv' csv Header;
    
    1. Now in db2, import using:
    COPY table_name FROM E'C:\\Users\\dinesh\\Documents\\table_name.csv' WITH Delimiter ',' Null '' csv;
    

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