feat(pg-from): constrains

package/postgres/pg-from/test/fixture/test.sql

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+-- Enable foreign key constraints
+PRAGMA foreign_keys = ON;
+
+BEGIN TRANSACTION;
+
+-- Table: authors
+CREATE TABLE authors (
+    id INTEGER PRIMARY KEY,              -- Primary key using INTEGER PRIMARY KEY
+    name TEXT NOT NULL,                  -- Required field
+    email TEXT UNIQUE                    -- Unique email constraint
+);
+
+-- Table: books
+CREATE TABLE books (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,  -- Auto-incrementing primary key
+    title TEXT NOT NULL,
+    author_id INTEGER NOT NULL,
+    published_date DATE,                   -- Date stored as TEXT (or ISO8601 format)
+    price REAL,
+    CONSTRAINT fk_author FOREIGN KEY(author_id) REFERENCES authors(id)
+);
+
+-- Table: reviews with composite primary key and a CHECK constraint
+CREATE TABLE reviews (
+    book_id INTEGER,
+    review_id INTEGER,
+    reviewer TEXT,
+    rating INTEGER CHECK (rating BETWEEN 1 AND 5),  -- Check constraint to restrict rating values
+    comment TEXT,
+    PRIMARY KEY (book_id, review_id),
+    FOREIGN KEY(book_id) REFERENCES books(id)
+);
+
+-- Create a standard index on books (non-unique)
+CREATE INDEX idx_books_title ON books(title);
+
+-- Create a partial index (only rows where price > 10)
+CREATE INDEX idx_books_price ON books(price) WHERE price > 10;
+
+-- Table: book_log for logging inserted books
+CREATE TABLE book_log (
+    log_id INTEGER PRIMARY KEY,
+    book_id INTEGER,
+    created_at DATETIME DEFAULT CURRENT_TIMESTAMP
+);
+
+-- Trigger: After inserting a book, log its id into book_log
+CREATE TRIGGER trg_book_insert
+AFTER INSERT ON books
+BEGIN
+    INSERT INTO book_log (book_id) VALUES (new.id);
+END;
+
+-- Create a view joining authors and books
+CREATE VIEW vw_author_books AS
+SELECT a.name AS author,
+       b.title,
+       b.published_date,
+       b.price
+FROM authors a
+JOIN books b ON a.id = b.author_id;
+
+-- Insert sample data into authors
+INSERT INTO authors (id, name, email) VALUES (1, 'Author One', 'author1@example.com');
+INSERT INTO authors (name, email) VALUES ('Author Two', 'author2@example.com');
+
+-- Insert sample data into books
+INSERT INTO books (title, author_id, published_date, price) VALUES ('Book One', 1, '2020-01-01', 9.99);
+INSERT INTO books (title, author_id, published_date, price) VALUES ('Book Two', 2, '2021-05-15', 19.99);
+
+-- Insert sample data into reviews
+INSERT INTO reviews (book_id, review_id, reviewer, rating, comment)
+VALUES (1, 1, 'Reviewer A', 4, 'Good book');
+INSERT INTO reviews (book_id, review_id, reviewer, rating, comment)
+VALUES (1, 2, 'Reviewer B', 5, 'Excellent!');
+INSERT INTO reviews (book_id, review_id, reviewer, rating, comment)
+VALUES (2, 1, 'Reviewer C', 3, 'Average');
+
+COMMIT;