From 9bb6a079ca72e39c1314a096f74c37b59da55063 Mon Sep 17 00:00:00 2001
From: Frank Xu <frank.w.xu@gmail.com>
Date: Wed, 8 Oct 2025 09:12:53 -0400
Subject: [PATCH] add sqlite tutorial 2

---
 .../sqlite_tutorial/sqlite_commands_2.txt     | 51 +++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 Android10/sqlite_tutorial/sqlite_commands_2.txt

diff --git a/Android10/sqlite_tutorial/sqlite_commands_2.txt b/Android10/sqlite_tutorial/sqlite_commands_2.txt
new file mode 100644
index 0000000..6f21453
--- /dev/null
+++ b/Android10/sqlite_tutorial/sqlite_commands_2.txt
@@ -0,0 +1,51 @@
+CREATE TABLE users (
+    user_id INTEGER PRIMARY KEY,
+    name TEXT NOT NULL,
+    email TEXT
+);
+
+CREATE TABLE orders (
+    order_id INTEGER PRIMARY KEY,
+    user_id INTEGER,
+    product TEXT,
+    amount REAL,
+    FOREIGN KEY (user_id) REFERENCES users(user_id)
+);
+
+INSERT INTO users (name, email) VALUES
+('Alice', 'alice@example.com'),
+('Bob', 'bob@example.com'),
+('Charlie', 'charlie@example.com');
+
+INSERT INTO orders (user_id, product, amount) VALUES
+(1, 'Laptop', 999.99),
+(1, 'Mouse', 29.99),
+(2, 'Keyboard', 59.99);
+
+SELECT * FROM users;
+SELECT * FROM orders;
+
+SELECT users.name, orders.product, orders.amount
+FROM users
+INNER JOIN orders
+ON users.user_id = orders.user_id;
+
+SELECT users.name, orders.product, orders.amount
+FROM users
+LEFT JOIN orders
+ON users.user_id = orders.user_id;
+
+SELECT users.name, orders.product, orders.amount
+FROM users
+INNER JOIN orders
+ON users.user_id = orders.user_id
+WHERE orders.amount > 100;
+
+SELECT users.name
+FROM users
+LEFT JOIN orders
+ON users.user_id = orders.user_id
+WHERE orders.user_id IS NULL;
+
+INSERT INTO orders (user_id, product, amount)
+VALUES (3, 'Tablet', 299.99);