By Lorentz D.
This reference features a whole description of the based question Language (SQL) used to control details in an Oracle database. Oracle SQL is a superset of the yankee nationwide criteria Institute (ANSI) and the foreign criteria association (ISO) SQL99 common.
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Extra info for Oracle 9i. SQL Reference
Specify a floating-point number using the following form: NUMBER 2-12 SQL Reference Datatypes The absence of precision and scale designators specifies the maximum range and precision for an Oracle number. See Also: "Floating-Point Numbers" on page 2-14 Scale and Precision Specify the scale and precision of a fixed-point number column for extra integrity checking on input. Specifying scale and precision does not force all values to a fixed length. If a value exceeds the precision, Oracle returns an error.
In 1979, Relational Software, Inc. (now Oracle Corporation) introduced the first commercially available implementation of SQL. Today, SQL is accepted as the standard RDBMS language. SQL Standards Oracle Corporation strives to comply with industry-accepted standards and participates actively in SQL standards committees. Industry-accepted committees are the American National Standards Institute (ANSI) and the International Standards Organization (ISO), which is affiliated with the International Electrotechnical Commission (IEC).
SYSDATE + (10/1440) is ten minutes from now. Subtracting the hiredate column of the sample table employees from SYSDATE returns the number of days since each employee was hired. You cannot multiply or divide DATE values. Oracle provides functions for many common date operations. For example, the ADD_MONTHS function lets you add or subtract months from a date. The MONTHS_ BETWEEN function returns the number of months between two dates. The fractional portion of the result represents that portion of a 31-day month.