SQLite Foreign Key

Question

I\'m following the instructions from the SQLite documentation at http://www.sqlite.org/foreignkeys.html however my attempt to add a foreign key is failing. Here are my crea

Answer 1

I think the above answers are not entirely correct, or at least slightly misleading. As they correctly pointed out, you can create the column, then on a separate line add a foreign key constraint. This is called specifying a table constraint.

But there is also a shorter syntax, when applying only on 1 column, all 4 possible constraints (PRIMARY KEY, UNIQUE, CHECK, FOREIGN KEY) can also be specified inline (like NOT NULL, for example), as a column constraint. I.e. you can write:

CREATE TABLE 
item (
    _id INTEGER PRIMARY KEY AUTOINCREMENT,  
    checklist_id REFERENCES checklist(_id), 
    item_text TEXT, item_hint TEXT, 
    item_order INTEGER, 
    created_on INTEGER, 
    modified_on INTEGER
);

By the way, if you are ever unsure about the correct syntax, the official documentation has really nice railroad diagrams.