(5) 创建一个存储过程,随机为每个订单向订单详情表(lineitem) 1~3条订单详情数据。只需要填入订单编号orderkey, 零件编号partkey, 供应商编号suppkey, 订单详情编号linenumber,和数量quantity五项信息,其中orderkey为订单对应的订单编号,partkey和suppkey必须为partsupp表中存在的零件编号和供应商编号,linenumber从1开始顺序编号,quantity为随机整数。
时间: 2024-02-05 12:12:37 浏览: 32
以下是创建存储过程的 SQL 代码:
```
DELIMITER //
CREATE PROCEDURE random_lineitems()
BEGIN
DECLARE i INT DEFAULT 1;
DECLARE order_count INT;
DECLARE order_id INT;
DECLARE part_count INT;
DECLARE part_id INT;
DECLARE supp_count INT;
DECLARE supp_id INT;
DECLARE quantity INT;
SELECT COUNT(*) INTO order_count FROM orders;
SELECT COUNT(*) INTO part_count FROM partsupp;
SELECT COUNT(*) INTO supp_count FROM partsupp;
WHILE i <= order_count DO
SET order_id = (SELECT orderkey FROM orders LIMIT i-1, 1);
SET part_id = (SELECT partkey FROM partsupp LIMIT FLOOR(RAND() * part_count), 1);
SET supp_id = (SELECT suppkey FROM partsupp LIMIT FLOOR(RAND() * supp_count), 1);
SET quantity = FLOOR(RAND() * 3) + 1;
INSERT INTO lineitem (orderkey, partkey, suppkey, linenumber, quantity)
VALUES (order_id, part_id, supp_id, i, quantity);
IF RAND() < 0.5 THEN
SET part_id = (SELECT partkey FROM partsupp LIMIT FLOOR(RAND() * part_count), 1);
SET supp_id = (SELECT suppkey FROM partsupp LIMIT FLOOR(RAND() * supp_count), 1);
SET quantity = FLOOR(RAND() * 3) + 1;
INSERT INTO lineitem (orderkey, partkey, suppkey, linenumber, quantity)
VALUES (order_id, part_id, supp_id, i+1, quantity);
END IF;
IF RAND() < 0.33 THEN
SET part_id = (SELECT partkey FROM partsupp LIMIT FLOOR(RAND() * part_count), 1);
SET supp_id = (SELECT suppkey FROM partsupp LIMIT FLOOR(RAND() * supp_count), 1);
SET quantity = FLOOR(RAND() * 3) + 1;
INSERT INTO lineitem (orderkey, partkey, suppkey, linenumber, quantity)
VALUES (order_id, part_id, supp_id, i+2, quantity);
END IF;
SET i = i + 1;
END WHILE;
END //
DELIMITER ;
```
这个存储过程会循环遍历所有订单,对于每个订单,随机选择 1~3 条订单详情数据,并插入到 lineitem 表中。其中,partkey 和 suppkey 的值是从 partsupp 表中随机选择的,quantity 的值是一个随机整数。
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