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How can I migrate data from on PostgreSQL database to another PostgreSQL database? Is there any technique to migrate data with SQL scripting?

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There is a bulk loader utility maintained through the PostgreSQL foundation called pg_bulkload. This might do what you want. –  ConcernedOfTunbridgeWells Apr 5 '12 at 10:12
    
The Navicat for PostgreSQL database admin tool can also do this sort of thing, amongst many others. –  kfuglsang Apr 5 '12 at 10:55
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What's wrong with pg_dump/pg_restore? –  a_horse_with_no_name Apr 5 '12 at 12:51
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Or good old SQL COPY? –  Erwin Brandstetter Apr 6 '12 at 0:14
    
I am new to database migration and the problem is that the destination database has one additional field. –  Atul Makwana Apr 9 '12 at 13:40
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2 Answers

If your destination database has only one additional column, I think the simplest thing to do would be to pg_dump the existing database, load that dump into a completely new database, then add the new column.

An alternative might be to use the --column-inserts option (among others) for pg_dump. That will dump data as SQL INSERT statements with explicit column names. Those INSERT statements should work fine on tables that have had columns added.

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Since plain pg_dump specifies the column names in the copy command and it is the destination database that has the added column then you shouldn't need to use the --column-inserts option, or an additional database either. –  gsiems Sep 6 '12 at 20:08
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If you migrate to a new version of PostgreSQL use pg_dump from the latest version. Anyway, this is a simple way to dump and restore :

pg_dump -U username -h hostname source_database | psql -U username target_database
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