No question, everyone should use standardized, cross-platform syntax if at all possible.
Maybe someday ANSI will standardize some kind of upsert syntax; until that time use upsert only if you are explicitly tying your SQL to your particular database.
https://en.wikipedia.org/wiki/Merge_(SQL)
No question, everyone should use standardized, cross-platform syntax if at all possible.
Maybe someday ANSI will standardize some kind of upsert syntax; until that time use upsert only if you are explicitly tying your SQL to your particular database.