I guess that many people using UPDATE … FROM on a daily basis do so without being aware that they are violating all SQL standards.   All versions of the ANSI SQL standard that I checked agree that an UPDATE statement has three clauses – the UPDATE clause, naming the table to be updated; the SET clause, specifying the columns to change and ...

Under the description for UPDATE in SQL Server 2000 and 2005 Books Online, you can find the following statement (thanks to SQL Server MVP Steve Kass for pointing me to this passage): The results of an UPDATE statement are undefined if the statement includes a FROM clause that is not specified in such a way that only one value is available for ...

Within the SQL Server community, there is so much publicity on T-SQL set-oriented processing as good practice and the use of T-SQL cursors as bad practice that  T-SQL cursors are effectively being seen as a plague to be avoided when in fact it's not the use of T-SQ cursors, but their misuse, that should be avoided. To be fair, I must say that ...

Did you know that SQL Server allows stored procedures to have up to 2100 parameters? And more important: do you care? Well, some people do care, and Joe Celko seems to be one of them.   If you are a regular reader of SQL Server newsgroups, you probably know Joe Celko from his always unfriendly and often incorrect replies. Here is a typical ...