Teradata Structured Query Language (SQL) is the industry standard language for communicating
with Relational Database Management Systems. SQL is used to look up data in relational
tables, create tables, insert data into tables, grant permissions and many other things.

Structured Query Language is used to define the answer set that is returned from the
RDBMS. SQL is a non-procedural, set-oriented language, meaning it does not rely on
procedural-type statements such as those listed here:

  •  GO TO
  •  OPEN FILE
  •  CLOSE FILE
  •  END OF FILE

To offer an ‘ANSI-standard’ product, all vendors of SQL must become certified in ANSI
(American National Standards Institute) standards by the NIST (National Institute of
Standards and Technology), a government certification agency.

There are three ANSI standards:

  • ANSI SQL-89 (SQL 1)
  • ANSI SQL-92 (SQL 2)
  • ANSI SQL-99 (SQL 3)

There are differing levels of compliance within each level:

  •  ANSI SQL-92 (SQL 2)
    Entry Level
    Intermediate Level
    Full Level
  •  ANSI SQL-99 (SQL 3)
    Core
    Enhanced
    Full Level

Teradata SQL is an ANSI compliant product. Teradata has its own extensions to the
language, as do most vendors. Teradata SQL is fully certified at the SQL92 Entry level, with
some intermediate, some full and some SQL-99 Core features also implemented.

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