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SQL Plus

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SQL*Plus is the most basic Oracle Database utility, with a basic command-line interface, commonly used by users, administrators, and programmers.

Command types

SQL*Plus understands five categories of text:[1]

  1. SQL statements
  2. PL/SQL blocks
  3. SQL*Plus internal commands, for example:
    1. environment control commands such as SET
    2. environment monitoring commands such as SHOW
  4. Comments
  5. External commands prefixed by the ! char

Scripts can include all of these components.

An Oracle programmer in the appropriately configured software environment can launch SQL*Plus, for example, by entering: 

$ sqlplus scott/tiger

where the Oracle user scott has the password tiger. SQL*Plus then presents a prompt with the default form of: 

SQL>

Interactive use can then start by entering a SQL statement (terminated by a semicolon), a PL/SQL block, or another command. For example: 

SQL> select 'Hello world' as example from dual;

EXAMPLE
--------------------------------
Hello world

History

The first version of SQL*Plus was called UFI ("User Friendly Interface"). UFI appeared in Oracle database releases up to Version 4.

After Oracle programmers had added new features to UFI, its name became Advanced UFI. The name "Advanced UFI" changed to "SQL*Plus" with the release of the version 5 of Oracle[2].

As of August 2013, the product continues to bear the name SQL*Plus.

Usage

Graphical interfaces from Oracle or third parties have diminished the proportion of Oracle database end-users who depend on the SQL*Plus environment. Oracle shops typically continue to use SQL*Plus scripts for batch updating or simple reports.[citation needed]

Oracle Corporation's wrappers/gui-fications/replacements for SQL*Plus include:

Oracle 11g

Starting from Oracle database 11g, iSqlplus (web based) and sqlplus graphical GUI no longer ship with Oracle database software.[7] The command-line SQL*Plus interface continues in use, mostly[citation needed] for non-interactive scripting or for administrative purposes (connect internal before Oracle 8i; sqlplus ... as sysdba later).

Compatibility

Other vendors have made their software somewhat compatible with SQL*Plus script commands or offer a SQL*Plus mode of operation. Relevant products include TOAD from Quest Software.[citation needed]

Integration

Variables

SQL*Plus-internal variables, accessible within an SQL*Plus session, include:

  • user variables, displayable with the DEFINE command and referenceable with one or two cases of a prefixed character (default prefixes: '&' and '&&'). These variables are called "substitution variables" and can be used anywhere in a SQL or PL SQL statement or in SQL Plus commands. They can be populated by a literal using DEFINE or from the database using the column command.
    • predefined variables, prefixed with an underscore ('_')[8]
    • substitution variables, useful for interacting with user-input[9]
  • bind variables, prefixed by a colon (':'), which can interact with the PL/SQL environment. Displayable with the VARIABLE and PRINT commands[10]

Supplementary software

  • SQL Assistant SQL Assistant add-on for SQL*Plus Windows version extends SQL*Plus with SQL automatic word completion, in-line Oracle SQL Reference, data export/import, code unit testing, data browsing, and code development functions.
  • rlwrap rlwrap does GNU Readline like command completion for SQL*Plus on UNIX and Linux.

See also

References

  1. ^ "SQL*Plus at orafaq.com". Archived from the original on 2007-11-09. Retrieved 2007-11-26.
  2. ^ Oracle Insights (1st ed.). 2004. p. 35. ISBN 978-1590593875. Retrieved March 18, 2014.
  3. ^ Evans, Robert (2008-10-01). "The SQL*Plus Worksheet". Cardiff University. Retrieved 2008-11-21. Oracle's SQL*Plus Worksheet is a straight-forward, easy-to-use, graphical user interface for SQL. {{cite web}}: Cite has empty unknown parameters: |month= and |coauthors= (help)
  4. ^ "ISQLPlus". Oracle FAQ. 2008-02-29. Retrieved 2008-11-21. iSQLPlus (iSQL*Plus) is a web-based utility similar to the SQL*Plus command line utility for executing SQL and PL/SQL commands (available up to Oracle 10gR2). {{cite web}}: Cite has empty unknown parameters: |month= and |coauthors= (help)
  5. ^ "Oracle SQL Developer 1.5: Feature List". Oracle Corporation. Retrieved 2008-11-21. The SQL*Plus commands supported by Oracle SQL Developer SQL Worksheet are listed [...] {{cite web}}: Cite has empty unknown parameters: |month= and |coauthors= (help)
  6. ^ "Oracle Application Express". Oracle Corporation. Retrieved 2008-11-21. SQL Workshop provides tools to enable you to view and manage database objects from a Web browser. Use SQL Commands to run SQL and PL/SQL statements. ... {{cite web}}: Cite has empty unknown parameters: |month= and |coauthors= (help)
  7. ^ Deprecated Components in Oracle Database 11g Release 1 (11.1), retrieve by 25-Jun-2009
  8. ^ Alapati, Sam R. (2008). "4". Expert Oracle Database 11g Administration. Apress. pp. 118–119. ISBN 978-1-4302-1015-3. Retrieved 2009-07-29. {{cite book}}: Cite has empty unknown parameters: |laydate=, |coauthors=, |nopp=, |month=, |separator=, |laysummary=, and |lastauthoramp= (help); External link in |chapterurl= (help); Unknown parameter |chapterurl= ignored (|chapter-url= suggested) (help)
  9. ^ Roshak, Natalka (2005-11-06). "Spice up your SQL Scripts with Variables". Oracle FAQ. Retrieved 2009-07-29. & and && indicate substitution variables in SQL*Plus scripts or commands.
  10. ^ Nyffenegger, René. "Using bind variables in SQL*Plus". René Nyffenegger's collection of things on the web. Retrieved 2009-07-29. In SQL*Plus, a bind variable is declared with variable [...] The value of the bind variable can then be printed with print {{cite web}}: Cite has empty unknown parameters: |month= and |coauthors= (help)
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