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A table must always have at least one column. Rows are not required.
SQL is a language. For example, SQL*Plus is a software program (which you will learn about in Chapter 2, “SQL: The Basics”) that allows you to use SQL language to interact with the database.
Most database systems are multiuser systems.
The entity relationship diagram is a logical model that doesn't deal with physical tables yet, but instead with entities and attributes.
Another cardinality notation used to depict a one-to-many relationship is 1:M or 1:N.
The schema diagram ...