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What does the following sentence mean?
Finally, don’t use mixed case
identifiers. Do everything lowercase,
so you don’t have to quote them.
Does it mean that I should change the commands such as CREATE TABLE, USER_ID and NOT NULL to lowercase? – It cannot because it would be against common naming conventions.
No, I think the gentleman referred to using all lowercase identifiers, e.g. table, column etc. names. This should have no impact on the commands like CREATE TABLE etc. that you use.
Marc