Unquoted identifiers must begin with an alphabetic character (see rule 6 here). You’re trying to assign a value to a column with a name starting with a number 1AO00, 1AP00 etc. Without seeing the table definition for CustomersPriceGroups we don’t know if it has columns with those names. If it does then they must have been created as quoted identifiers. If … Read more
SQL is evaluated backwards, from right to left. So the where clause is parsed and evaluate prior to the select clause. Because of this the aliasing of u_name to user_name has not yet occurred.
At first glance… All you need is a GROUP BY clause with the MAX aggregate function: It’s never that simple, is it? I just noticed you need the content column as well. This is a very common question in SQL: find the whole data for the row with some max value in a column per some group identifier. I heard that … Read more
You can try it this way:
Assuming that you’re on SQL Server 2005 or greater, you can use a CTE with ROW_NUMBER():
Just in case anyone still cares: I had the same issue after copying a database directory directly using command If you do this with a database that uses InnoDB tables, you will get this crazy ‘table does not exist’ error mentioned above. The issue is that you need the ib* files in the root of the MySQL datadir (e.g. ibdata1, ib_logfile0 and ib_logfile1). … Read more
As the error message tells you – you can not have two rows with the same value in the columns dementia_type, snapid since they need to be unique. You have to make sure that the two databases has the same values for dementia_type, snapid. A workaround would be to add a column to your table alter table t_types_of_dementia add … Read more
This problem consists of two very different sub-problems: the string must be seemingly random the string must be unique While randomness is quite easily achieved, the uniqueness without a retry loop is not. This brings us to concentrate on the uniqueness first. Non-random uniqueness can trivially be achieved with AUTO_INCREMENT. So using a uniqueness-preserving, pseudo-random … Read more
You probably misunderstood/skipped point 4 in your list, Initialize MySQL. It means to either copy an existing data directory there or to create a new one, see Initializing the Data Directory Manually Using mysqld . To initialize a fresh data directory, you basically (after setting your config file) just have to run either or The … Read more
The reason you are getting the DECLARE error from your dynamic statement is because dynamic statements are handled in separate batches, which boils down to a matter of scope. While there may be a more formal definition of the scopes available in SQL Server, I’ve found it sufficient to generally keep the following three in … Read more