You’re getting this error because you’re trying to add/update a row to table2 that does not have a valid value for the UserID field based on the values currently stored in table1. If you post some more code I can help you diagnose the specific cause.
Works fine for me in 5.0.27 I just get a warning (not an error) that the table exists;
this issue is very to solve by windows server users go to this path C:\Program Files\MySQL\MySQL Server 5.1\bin run this tool “MySQLInstanceConfig.exe” and config the instatnce again and problem solved
Your subquery is selecting two columns, while you are using it to project one column (as part of the outer SELECT clause). You can only select one column from such a query in this context. Consider joining to the users table instead; this will give you more flexibility when selecting what columns you want from … Read more
Reading this original article on The Code Project will help you a lot: Visual Representation of SQL Joins. Also check this post: SQL SERVER – Better Performance – LEFT JOIN or NOT IN?. Find original one at: Difference between JOIN and OUTER JOIN in MySQL.
It’s probably because MySQL is installed but not yet running. To verify that it’s running, open up Activity Monitor and under “All Processes”, search and verify you see the process “mysqld”. You can start it by installing “MySQL.prefPane”. Here is the complete tutorial which helped me: http://obscuredclarity.blogspot.in/2009/08/install-mysql-on-mac-os-x.html
Possible Duplicate:mysql_escape_string VS mysql_real_escape_string I need to get company_name (given by user through a form) entered into my mysql database. When I use I get an error But everything seems to fine while using What can I do in such cases?
I am using MySQL and MySQL Workbench 5.2 CE. When I try to concatenate 2 columns, last_name and first_name, it doesn’t work :
I have set up PHP, MySQL, and Apache. localhost() for PHP and it is working well. But after I downloaded MySQL, it reports: Fatal error: Call to undefined function mysql_connect() How can I fix this?
Note: For MySQL 5.7+, please see the answer from Lahiru to this question. That contains more current information. For MySQL < 5.7: The default root password is blank (i.e., an empty string), not root. So you can just log in as: You should obviously change your root password after installation: In most cases you should … Read more