tacnode

Type Conversion

Chapter Type Conversion

Table of Contents

Overview

Operators

Functions

Value Storage

UNION, CASE, and Related Constructs

SELECT Output Columns

SQL statements can, intentionally or not, require the mixing of different data types in the same expression. Tacnode has extensive facilities for evaluating mixed-type expressions.

In many cases a user does not need to understand the details of the type conversion mechanism. However, implicit conversions done by Tacnode can affect the results of a query. When necessary, these results can be tailored by using explicit type conversion.

This chapter introduces the Tacnode type conversion mechanisms and conventions. Refer to the relevant sections in Chapter 7 and Chapter 8 for more information on specific data types and allowed functions and operators.

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