Question

I have already created a table to the database.

Table is something like following (I am using sqlite on mac for iPhone dev)

create table
(
attendanceDate   varchar,
studentNo        integer,
absentDetail     varchar
);

Now I have already committed this statements. What I need is the following:

• Add a composite primary key (attandanceDate,studentNo)
• add a foreign key studentNo

I don’t know the alter table syntax in sqlite3.

So, I need help.

Thanks in advance.

Answer 1

SQLITE3 does not have syntax to do what you want.

From the SQLITE documentation at http://www.sqlite.org/lang_altertable.html

SQLite supports a limited subset of
ALTER TABLE. The ALTER TABLE command
in SQLite allows the user to rename a
table or to add a new column to an
existing table. It is not possible to
rename a colum, remove a column, or
add or remove constraints from a
table.

You will need to recreate the table with the composite primary key and foreign key defined.