Basic SQL Syntax Rules
This chapter presents the basic units of the SQL language and the simplest relationships between them.
The following units are considered:
Characters Basic language symbols: letters, digits, special characters. Identifiers SQL identifiers, host variable names. Data types Character, exact numeric, approximate numeric, date, time, timestamp, interval. Datetime and interval arithmetic. Literals Character, integer, decimal, floating point, date, time, timestamp, interval. Assignments Character, numeric, datetime and interval assignments. Data type conversions. Comparisons Character, numeric, datetime and interval comparison rules.
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