Hi you should have a look at this
http://dev.mysql.com/doc/refman/5.1/en/innodb-foreign-key-constraints.html
Everything you need is there
On Apr 2, 4:10 am, DeepakBhatia <toreachdee...@gmail.com> wrote:
> I have two tables as given below. I need to add a column in
> project_table which is INT and refers to the projecttype_table(id)
> field.
>
> project_table
> {
> Name Varchar(100)
>
> }
>
> projecttype_table
> {
> id INT AUTO INCREMENT NOT NULL,
> projecttype_name Varchar(50)
>
> }
>
> Approach #1
> ===========
>
> mysql> alter table project_table add foreign key(project_type)
> references projecttype_table(id);
> ERROR 1005 (HY000): Can't create table 'rtdb2.#sql-358a_96c' (errno:
> 150)
>
> Approach #2
> ===========
> mysql> ALTER TABLE project_table TYPE=InnoDB;
> Query OK, 7 rows affected, 1 warning (0.02 sec)
> Records: 7 Duplicates: 0 Warnings: 0
>
> mysql> alter table project_table add Foreign key (project_type)
> REFERENCES projecttype_table(id);
> ERROR 1005 (HY000): Can't create table 'rtdb2.#sql-358a_96c' (errno:
> 150)
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