For our purposes, all examples are in standard SQL, and these basic functions should translate to almost any environment. Data query types There are four basic types of data queries in SQL: ...

SQL Insider. Drilling Down on Queries. Now that you understand the basic structure of a SQL application, let's dissect the basis of information retrieval: the query.

As we saw in the last article, the SQL SELECT statement has the widest variety of query options, which are used to control the way data is returned. These options come in the form of clauses ...

In this article I’ll provide several subselect examples and discuss when to use them. ... SQL Basics I: Data Queries—covers database terminology and the four basic query types.