20261027

Question2/MySQL SQL問題集 part２.sql

@@ -0,0 +1,79 @@
+--<EFBFBD><EFBFBD><EFBFBD>P
+CREATE TABLE item_category (
+    category_id INT AUTO_INCREMENT PRIMARY KEY,
+    category_name VARCHAR(256) NOT NULL
+);
+
+INSERT INTO item_category(category_name) VALUES('<EFBFBD>Ƌ<EFBFBD>'),('<EFBFBD><EFBFBD><EFBFBD><EFBFBD>'),('<EFBFBD>H<EFBFBD>i');
+
+
+--<EFBFBD><EFBFBD><EFBFBD>Q
+CREATE TABLE items(
+    item_id INT AUTO_INCREMENT PRIMARY KEY,
+    name VARCHAR(256) NOT NULL,
+    price INT NOT NULL,
+    category_id INT,
+    FOREIGN KEY(category_id) REFERENCES item_category(category_id)
+);
+
+INSERT INTO items(name,price,category_id) 
+VALUES('<EFBFBD><EFBFBD><EFBFBD>[<5B>}<7D>̃e<CC83>[<5B>u<EFBFBD><75>',150000,1),('<EFBFBD><EFBFBD><EFBFBD>[<5B><><EFBFBD><EFBFBD><EFBFBD>[<5B><>2000 500ml',370,2),('<EFBFBD><EFBFBD><EFBFBD>n<EFBFBD><EFBFBD>',2500,3),('<EFBFBD><EFBFBD><EFBFBD>f<EFBFBD>̈֎q',100000,1);
+
+--<EFBFBD><EFBFBD><EFBFBD>R
+SELECT 
+a.item_id,
+a.name,
+a.price,
+b.category_id,
+b.category_name 
+FROM items a
+INNER JOIN item_category b
+ON a.category_id = b.category_id;
+
+
+--<EFBFBD><EFBFBD><EFBFBD>S
+SELECT *
+FROM items
+ORDER BY price;
+
+--<EFBFBD><EFBFBD><EFBFBD>T
+SELECT 
+a.item_id,
+a.name,
+a.price,
+b.category_id,
+b.category_name 
+FROM items a
+INNER JOIN item_category b
+ON a.category_id = b.category_id AND b.category_name = '<EFBFBD>Ƌ<EFBFBD>';
+
+--<EFBFBD><EFBFBD><EFBFBD>U
+SELECT 
+a.item_id,
+a.name,
+a.price,
+b.category_id,
+b.category_name 
+FROM items a
+INNER JOIN item_category b
+ON a.category_id = b.category_id AND a.price <= 50000 AND a.price >= 1000;
+
+--<EFBFBD><EFBFBD><EFBFBD>V
+SELECT COUNT(*) AS data_count
+FROM items;
+
+--<EFBFBD><EFBFBD><EFBFBD>W
+SELECT * FROM items
+WHERE price = (SELECT MAX(price) FROM items);
+
+--<EFBFBD><EFBFBD><EFBFBD>X
+SELECT 
+a.item_id,
+a.name,
+a.price,
+b.category_id,
+b.category_name 
+FROM items a
+INNER JOIN item_category b
+ON a.category_id = b.category_id
+WHERE a.name LIKE'%<25><>%';