DF188: Length is not specified when declaring variable or parameter with varying-length data type.

The topic describes the DF188 T-SQL code analysis rule.

Category

BEST PRACTICE

Message

Length is not specified when declaring variable or parameter with varying-length data type.

Description

To prevent data truncation errors, it is advisable to explicitly specify the data length for variables or parameters with varying-length data types.

Noncompliant code example

DECLARE @c VARCHAR
SELECT @c AS c
GO

Compliant solution

DECLARE @c VARCHAR(128)
SELECT @c AS c
GO