Question

Hello I have a PostgreSQL 9.1 database with such tables [tables are simplified]

For now I use only tables: account, account_word and word. But I wanted to add groups of words into my database. So I created tables wordgroup and wordgroup_word. Now my table account_word is no longer needed so I would like to move all words from account_word to wordgroup_word. In general:

I would like to move all account’s word to his wordgroup where group’s “is_all” is true and then delete account_word table

Could someone help me to achieve this?

Cheers

Answer 1

move all words from account_word to wordgroup_word.

 insert into wordgroup_word 
    select  wordgroup_id, word_id
    from account_word aw join wordgroup wg 
    on aw.account_id = wg.account_id 
    and is_all=true