Hi,

studying to do my Oracle OCA and i do not seem to understand the example in the oracle certified books for the GREATEST function. What is written is:

select greatest ('19', '24',9) string from dual

The result of this is: 9.
I have also run this on Oracle SQL*PLUS which gives me the same answer.

I do not understand why this is the case if it is the 1st expression datatype which...