RowCount

Get the rowcount in all tables

BIT of a Problem

The BIT data type is an awkward fit for a SQL database. It doesn't have just two values, and it can do unexpected things in expressions. What is worse, it is a flag rather than a predicate, and so its overuse, along with bit masks, is a prime candidate for being listed as a 'SQL Code Smell'. Joe Celko makes the case.

Count Distinct

CONVERT function

Issues with IsDate()

IsDate function returns 1 for a numeric value

Contiguous Time Periods

It is always more efficient to maintain referential integrity by using constraints rather than triggers. Sometimes it isn't obvious how to do this. Until a recent idea by Alex Kuznetsov, the history table presented problems for checking data that were difficult to solve with constraints. Joe Celko explains.

Before Insert or Update Trigger

RANK() returns consecutive integers

TRUNCATE in TRANSACTION

Identity Property Range Checking in SQL Server

This article examines practical methods of managing and monitoring large tables which make use of the IDENTITY property.