CODEWITHSUNDEEP
sqlsqlite
Sajad Rastegar
Sajad Rastegar

Reputation: 3154

Why this sql query doesn't return any error?

When i run these queries:

create table University ( branch text primary key, region text, enrollment int);
create table Student ( sID int primary key, sName text, average int);
create table Apply ( sID int references Student(sID), branch text references University(branch), major text, decision text);

insert into Apply values ( 123, 'stanford', 'CS', 'Y');

It should return an error because i am inserting a tuple that doesn't have a Corresponding value in the reference table. but when i run these commands, this tuple inersts Successfully. What's wrong with this queries? My DBMS is sqlite and i'm using sqliteman.

Upvotes: 0

Views: 107

Answers (1)

dani herrera
dani herrera

Reputation: 51725

You should learn how to enable foreign key support

Quoting docs:

In order to use foreign key constraints in SQLite, the library must be compiled with neither SQLITE_OMIT_FOREIGN_KEY or SQLITE_OMIT_TRIGGER defined. If SQLITE_OMIT_TRIGGER is defined but SQLITE_OMIT_FOREIGN_KEY is not, then SQLite behaves as it did prior to version 3.6.19 - foreign key definitions are parsed and may be queried using PRAGMA foreign_key_list, but foreign key constraints are not enforced. The PRAGMA foreign_keys command is a no-op in this configuration. If OMIT_FOREIGN_KEY is defined, then foreign key definitions cannot even be parsed (attempting to specify a foreign key definition is a syntax error).

Also read sqliteman constraint triggers:

There is one more unsupported SQL feature. Sqlite does not enforce foreign keys and not null constraints.

Upvotes: 1

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