SQL query to select dates between two dates
you should put those two dates between single quotes like.. or can use keep in mind that the first date is inclusive, but the second is exclusive, as it effectively is ‘2011/02/27 00:00:00’
Database
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 :
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
how to fix oracle ORA-01722 invalid number error
If you have a numeric column, all you have to do is use a to_char with the right parameters; this should do the work:
SQL error “ORA-01722: invalid number”
A very easy one for someone, The following insert is giving me the ORA-01722: invalid number why?
Self Join to get employee manager name
EDIT: Left Join will work if emp_mgr_id is null.
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
Conversion failed when converting date and/or time from character string while inserting datetime
There are many formats supported by SQL Server – see the MSDN Books Online on CAST and CONVERT. Most of those formats are dependent on what settings you have – therefore, these settings might work some times – and sometimes not. The way to solve this is to use the (slightly adapted) ISO-8601 date format … Read more
The wait operation timed out. ASP
If you found the exact error “The wait operation timed out” then it is likely you have a database call that took longer than expected. This could be due to any number of things: Transient network problem High SQL server load Problem with SAN, RAID, or storage device Deadlock or other form of multiprocess contention … Read more