T Sql Select Top 1. Not all database systems support the select top clause. In this sql server example we show you how to select top 2 rows in each group using a subquery.
Performance surprises and assumptions. That isnt what you want. Select top 1 id from select uid from.
Performance surprises and assumptions.
The sql select top clause. Using top is also a really bad code smell. When using the exists operator we might think that adding top 1 to the select clause will reduce the amount of data required to satisfy the condition. In this article we will show you how to select top n records for each category or in each group in sql server with example.