在oracle数据库中,检查用于创建表的命令: SQL> CREATE TABLE orders(oid NUMBER(6) PRIMARY KEY, odate DATE, ccode NUMBER(6), oamt NUMBER(10,2)) TABLESPACE users; 下列哪两种说法正确A.Orders表是在USERS表空间中创建的唯一对象B.一个NOT NULL约束的OID列上
Write an SQL query to find the most recent 3 orders of each user. If a user ordered less than 3 orders return all of their orders. Return the result table sorted by customer_name in ascending order and in case of a tie by the customer_id in ascending order. If there still a tie,...
代码示例:创建分区表 CREATETABLEorders ( order_id BIGINT, customer_id INT, order_date DATE, total_amount DECIMAL(10, 2) )PARTITIONBYHASH(customer_id)PARTITIONS4; 优化点: • 使用 HASH 分区确保数据均匀分布。 • 根据查询需求选择分区键,避免数据倾斜。 2. 并行查询 GBase 的并行查询功能可充分...
UNIQUE KEY `ux_undo_log` (`xid`,`branch_id`) ) ENGINE=InnoDB AUTO_INCREMENT=137 DEFAULT CHARSET=utf8; 在jeecg-account...中,创建表并插入数据 CREATE TABLE `account` ( `id` int(11) NOT NULL AUTO_INCREMENT, `user_id` int(11) DEFAULT...库中,创建表 CREATE TABLE `orders` ( ...
Write an SQL query to find the number ofunique ordersand the number ofunique customerswith invoices> $20for eachdifferent month. Return the result table sorted inany order. The query result format is in the following example: 查询结果
(aliased as 'a') and the 'orders' table (aliased as 'b') based on the condition that 'salesman_id' is equal in both tables and filtering rows based on the condition that 'purch_amt' is equal to the maximum 'purch_amt' for the same 'ord_date' FROM salesman a, orders b WHERE a...
Write an SQL query to find the most recent 3 orders of each user. If a user ordered less than 3 orders return all of their orders. Return the result table sorted by customer_name in ascending order and in case of a tie by the customer_id in ascending order. If there still a tie,...
(SELECT cust_id FROM customers WHERE cust_name = 'MARTIN')); SELECT ord_id, cust_id, ord_total FROM orders Where ord_date IN (SELECT ord_date FROM orders, customers Where cust _ name = 'Martin'); SELECT ord_id, cust_id, ord_total FROM orders WHERE cust_id IN (SELECT cust_id ...
DataTableResponseObjectOutput DefaultAuthorizationPolicy DefaultAuthorizationPolicyOutput DefaultErrorResponseErrorDetailsItemOutput DefaultErrorResponseErrorOutput DefaultErrorResponseOutput DeletedAppRestoreRequest DeletedAppRestoreRequestOutput DeletedAppRestoreRequestProperties DeletedAppRestoreRequestPropertiesOutput D...
DataTableResponseColumn DataTableResponseColumnOutput DataTableResponseObject DataTableResponseObjectOutput DefaultAuthorizationPolicy DefaultAuthorizationPolicyOutput DefaultErrorResponseErrorDetailsItemOutput DefaultErrorResponseErrorOutput DefaultErrorResponseOutput DeletedAppRestore...