String concatenation in MySQL
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 :
MySQL
ERROR 1045 (28000): Access denied for user ‘root’@’localhost’ (using password: YES)
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
Cannot add or update a child row: a foreign key constraint fails
table #1: Field Type Null Key Default Extra UserID int(11) NO PRI NULL auto_increment Password varchar(20) NO Username varchar(25) NO Email varchar(60) NO table #2: Field Type Null Key Default Extra UserID int(11) NO MUL PostID int(11) NO PRI NULL auto_increment Title varchar(50) NO Summary varchar(500) NO Error: com.mysql.jdbc.exceptions.MySQLIntegrityConstraintViolationException: Cannot add or update a child … Read more
MySQL string replace
Now rows that were like http://www.example.com/articles/updates/43 will be
ERROR 1045 (28000): Access denied for user ‘root’@’localhost’ (using password: YES)
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
Column count doesn’t match value count at row 1
The error means that you are providing not as much data as the table wp_posts does contain columns. And now the DB engine does not know in which columns to put your data. To overcome this you must provide the names of the columns you want to fill. Example: Look up the table definition and see which … Read more
ERROR 1045 (28000): Access denied for user ‘root’@’localhost’ (using password: YES)
Note: For MySQL 5.7+ please see answer from @Lahiru to this question. That contains more current information. For MySQL < 5.7: The default root password is blank (i.e. empty string) not root. So you can just login as: You should obviously change your root password after installation In most cases you should also set up individual user accounts before working extensively … Read more
Access Denied for User ‘root’@’localhost’ (using password: YES) – No Privileges?
Use the instructions for resetting the root password – but instead of resetting the root password, we’ll going to forcefully INSERT a record into the mysql.user table In the init file, use this instead
Access Denied for User ‘root’@’localhost’ (using password: YES) – No Privileges?
Use the instructions for resetting the root password – but instead of resetting the root password, we’ll going to forcefully INSERT a record into the mysql.user table In the init file, use this instead
How to use mysqli_query() in PHP?
I have to admit, mysqli_query() manual entry doesn’t contain a clean example on how to fetch multiple rows. May be it’s because the routine is so routine, known to PHP folks for decades: In case you want to print the column titles, you have to select your data into a nested array first and then use keys … Read more