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A table can have one or more columns.
A column is made up of a column name and a data type, and it describes an attribute of the
tuples. The structure of a table, also called relation schema, thus is de?ned by its attributes.
The type of information to be stored in a table is de?ned by the data types of the attributes
at table creation time.
SQL uses the terms table, row, and column for relation, tuple, and attribute, respectively. In
this tutorial we will use the terms interchangeably.
A table can have up to 254 columns which may have di?erent or same data types and sets of
values (domains), respectively...
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