1) What are the different versions available with informix ?
2) From which version, CASE statements are supported ? ( In older versions, DECODE statements are supported, If I am right )
3) Is there ANSI join supported in Informix, if so from which version ?
4) Is Informix a open source or can I install the evaluation copy, from where can I download the Informix database software, Please give the link if any.