I keep getting: SQL error: ERROR: could not create unique index "service_import_checksum_key" DETAIL: Key (checksum)=() is duplicated. In statement: ALTER TABLE "public"."service_import...

I'm not great with statistical mathematics, etc. I've been wondering, if I use the following: import uuid unique_str = str(uuid.uuid4()) double_str = ''.join([str(uuid.uuid4()), str(uuid.uuid4())]...

I am processing a CSV file and counting the unique values of column 4. So far I have coded this three ways. One uses "if key in dictionary", the second traps the KeyError and the third uses "Defaul...

I got many, many files to be uploaded to the server, and I just want a way to avoid duplicates. Thus, generating a unique and small key value from a big string seemed something that a checksum was...

I was told by a friend: What unique key do you use? I hope you are not saving the entire user name --- this will use up too much table space! Assign an unique userID to each (unique) userNAME...

I would like a solution to enforce a constraint only if a column is not null. I can't seem to find a way to do this in the documentation. create table mytable( table_identifier_a INTEGER, table_...

I've got a column in a table (eg. UserName) which I want to make sure is unique. So I create a unique key for that column and call it IX_Users_UserName. Now, if I do lots of searching for users ba...