db2 replace fails with SQLCODE=-171

Question

We have a select statement with the following:

SELECT REPLACE(REPLACE(EMAIL, x'00', ''), '\n', '') AS EMAIL FROM tabname 

This fails with SQLCODE=-171 because EMAIL is empty. What is the most efficient way to replace EMAIL only if EMAIL has content? EMAIL is defined as a varchar. The actual select is pulling multiple columns and doing a replace on most.

Answer 1

如果你这样做？

SELECT REPLACE(REPLACE(ifnull(EMAIL, ''), x'00', ''), '\n', '') AS EMAIL FROM tabname