mysql

问题 Im currently writing a database for a school project. Im using MySQL on xampp and trying to add this table to my database. Im still not 100% on my SQL syntax and theres an error here I cannot seem ti figure out: CREATE TABLE photoDB( U_id INT UNSIGNED NOT NULL FOREIGN KEY REFERENCES userDB(U_id), P_id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY, C_id INT UNSIGNED NOT NULL FOREIGN KEY REFERENCES table_comments(C_id), PhotoName VARCHAR(50), Description TEXT NOT NULL, File VARCHAR, Views

问题 Im currently writing a database for a school project. Im using MySQL on xampp and trying to add this table to my database. Im still not 100% on my SQL syntax and theres an error here I cannot seem ti figure out: CREATE TABLE photoDB( U_id INT UNSIGNED NOT NULL FOREIGN KEY REFERENCES userDB(U_id), P_id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY, C_id INT UNSIGNED NOT NULL FOREIGN KEY REFERENCES table_comments(C_id), PhotoName VARCHAR(50), Description TEXT NOT NULL, File VARCHAR, Views

问题 Im currently writing a database for a school project. Im using MySQL on xampp and trying to add this table to my database. Im still not 100% on my SQL syntax and theres an error here I cannot seem ti figure out: CREATE TABLE photoDB( U_id INT UNSIGNED NOT NULL FOREIGN KEY REFERENCES userDB(U_id), P_id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY, C_id INT UNSIGNED NOT NULL FOREIGN KEY REFERENCES table_comments(C_id), PhotoName VARCHAR(50), Description TEXT NOT NULL, File VARCHAR, Views

问题 I'm trying to find orders with only one item in a database running on MySQL 5.7.23 on Ubuntu 18.04 LTS. But somehow MySQL can't infer that COUNT(*) = 1 implies a functional dependence. The following 2-table database of orders with order items illustrates the failure: DROP TABLE IF EXISTS t_o, t_oi; CREATE TABLE t_o ( order_id INTEGER UNSIGNED PRIMARY KEY, placed_on DATE NOT NULL, INDEX (placed_on) ); INSERT INTO t_o (order_id, placed_on) VALUES (1, '2018-10-01'), (2, '2018-10-02'); CREATE

问题 I'm trying to find orders with only one item in a database running on MySQL 5.7.23 on Ubuntu 18.04 LTS. But somehow MySQL can't infer that COUNT(*) = 1 implies a functional dependence. The following 2-table database of orders with order items illustrates the failure: DROP TABLE IF EXISTS t_o, t_oi; CREATE TABLE t_o ( order_id INTEGER UNSIGNED PRIMARY KEY, placed_on DATE NOT NULL, INDEX (placed_on) ); INSERT INTO t_o (order_id, placed_on) VALUES (1, '2018-10-01'), (2, '2018-10-02'); CREATE

问题 I'm trying to find orders with only one item in a database running on MySQL 5.7.23 on Ubuntu 18.04 LTS. But somehow MySQL can't infer that COUNT(*) = 1 implies a functional dependence. The following 2-table database of orders with order items illustrates the failure: DROP TABLE IF EXISTS t_o, t_oi; CREATE TABLE t_o ( order_id INTEGER UNSIGNED PRIMARY KEY, placed_on DATE NOT NULL, INDEX (placed_on) ); INSERT INTO t_o (order_id, placed_on) VALUES (1, '2018-10-01'), (2, '2018-10-02'); CREATE

问题 I have created a MySql server in Google Cloud SQL and trying it to connect it from my local machine using MySql Workbench but i am not able to establish a connection to it. I get the following error Failed to Connect to MySQL at {IP-Address}:3306 with user root(10060) 回答1: If you are trying to connect from outside network to gcp sql instance you need to add your public ip of your machine in the connection of sql instance Go to your sql instance Go to Connections tab Under Connectivity select

问题 I have created a MySql server in Google Cloud SQL and trying it to connect it from my local machine using MySql Workbench but i am not able to establish a connection to it. I get the following error Failed to Connect to MySQL at {IP-Address}:3306 with user root(10060) 回答1: If you are trying to connect from outside network to gcp sql instance you need to add your public ip of your machine in the connection of sql instance Go to your sql instance Go to Connections tab Under Connectivity select

问题 I have created a MySql server in Google Cloud SQL and trying it to connect it from my local machine using MySql Workbench but i am not able to establish a connection to it. I get the following error Failed to Connect to MySQL at {IP-Address}:3306 with user root(10060) 回答1: If you are trying to connect from outside network to gcp sql instance you need to add your public ip of your machine in the connection of sql instance Go to your sql instance Go to Connections tab Under Connectivity select

问题 I have the following table structure that has day wise shifts. At only C shift, time is shared by two days. As you can C Shift starts at 20:30 and ends the next's days 06:00 . The Table structure and data as follows create table `machine_shifts` ( `date` date , `shift_start_time` time , `shift_end_time` time , `shift` varchar (60), `updated_on` timestamp ); insert into `machine_shifts` (`date`, `shift_start_time`, `shift_end_time`, `shift`, `updated_on`) values('2010-01-01','06:00:00','14:30