Hash Data column size

A hash value is always 160 bits / 20 bytes (SHA1) or 256 bits / 32 bytes (SHA256) long regardless of what data it’s calculated on. Basically you should have a table with a binary column of 20 bytes or 32 bytes for the hash value.

Here is an example of an Oracle table with hash value instead of name:

CREATE TABLE NAMETABLE ( ident NUMBER PRIMARY KEY, 
                  name RAW(32));