>>There're 4 SHA-2 functions: SHA-224, SHA-256, SHA-384, and SHA-512, where the number in the name is the size of the returned hash in bits. To answer your question, the column type should be binary or varbinary and the size would depend on which one of the functions you're using: 24, 32, 48 or 64 bytes.
>
>224 bits = 28bytes (g,d&r)

Yes it's. My bad