How do I DROP a constraint from a sqlite (3.6.21) table?

Question

I have the following table:

CREATE TABLE child( 
  id INTEGER PRIMARY KEY, 
  parent_id INTEGER CONSTRAINT parent_id REFERENCES parent(id), 
  description TE         


        

Answer 1

I think this is an easier, more concise approach:

copy db.sqlite3 backup-db.sqlite3
echo .dump tablename | sqlite3 db.sqlite3 > modify.sql
(now delete or change the constraint in modify.sql)
echo drop table tablename; | sqlite3 db.sqlite3 
sqlite3 db.sqlite3 < modify.sql

You can now redump the new database table and compare the differences.