在SAP HANA上为表列生成哈希列

Question

I'll try to make it simple as possible as I can

I have a table TAB1 (ID, NAME, LASTNAME, AGE, DATEOFBIRTH, ID_CARD_NBR, SHA)

I need to generate a hash for these columns in a column SHA

the query to obtain that Hash on SAP Hana:

SELECT hash_sha256(
to_varbinary("ID"),
to_varbinary(IFNULL("NAME",'0')),
to_varbinary(IFNULL("LASTNAME",'0')),
to_varbinary(IFNULL("AGE",'0')),
to_varbinary(IFNULL("DATEOFBIRTH",'0')),
to_varbinary(IFNULL("ID_CARD_NBR",'0')) )

FROM "MYSCHEMA"."PERSONS"

The code should insert/update the SHA column

Thank you

Answer 1

If Id is the primary key(can't be NULL) you can do this :

UPDATE PERSONS
SET SHA = hash_sha256(to_varbinary("ID"),to_varbinary(IFNULL("NAME",'0')),to_varbinary(IFNULL("LASTNAME",'0')),to_varbinary(IFNULL("AGE",'0')),to_varbinary(IFNULL("DATEOFBIRTH",'0')),to_varbinary(IFNULL("ID_CARD_NBR",'0')) )
WHERE SHA IS NULL;  -- or other condition