запрос создания базы, актуальный

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PRAGMA foreign_keys = ON;
PRAGMA foreign_keys;
DROP TABLE if exists SubSequence;
DROP TABLE if exists Sequence;
CREATE TABLE Sequence (
ID INTEGER NULL PRIMARY KEY AUTOINCREMENT,
description TEXT,
string TEXT
);
CREATE TABLE SubSequence (
ID INTEGER NULL PRIMARY KEY AUTOINCREMENT,
string TEXT,
position INTEGER,
baseString INTEGER,
FOREIGN KEY(baseString) REFERENCES Sequence(ID) ON DELETE CASCADE
);
$