gooderp18绿色标准版
Вы не можете выбрать более 25 тем Темы должны начинаться с буквы или цифры, могут содержать дефисы(-) и должны содержать не более 35 символов.

38 lines
4.8KB

  1. <?xml version="1.0" encoding="UTF-8" standalone="no"?>
  2. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>DROP SCHEMA</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets V1.79.1" /><link rel="prev" href="sql-droprule.html" title="DROP RULE" /><link rel="next" href="sql-dropsequence.html" title="DROP SEQUENCE" /></head><body><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">DROP SCHEMA</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="sql-droprule.html" title="DROP RULE">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="sql-commands.html" title="SQL Commands">Up</a></td><th width="60%" align="center">SQL Commands</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 12.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="sql-dropsequence.html" title="DROP SEQUENCE">Next</a></td></tr></table><hr></hr></div><div class="refentry" id="SQL-DROPSCHEMA"><div class="titlepage"></div><a id="id-1.9.3.129.1" class="indexterm"></a><div class="refnamediv"><h2><span class="refentrytitle">DROP SCHEMA</span></h2><p>DROP SCHEMA — remove a schema</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis">
  3. DROP SCHEMA [ IF EXISTS ] <em class="replaceable"><code>name</code></em> [, ...] [ CASCADE | RESTRICT ]
  4. </pre></div><div class="refsect1" id="id-1.9.3.129.5"><h2>Description</h2><p>
  5. <code class="command">DROP SCHEMA</code> removes schemas from the database.
  6. </p><p>
  7. A schema can only be dropped by its owner or a superuser. Note that
  8. the owner can drop the schema (and thereby all contained objects)
  9. even if they do not own some of the objects within the schema.
  10. </p></div><div class="refsect1" id="id-1.9.3.129.6"><h2>Parameters</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="literal">IF EXISTS</code></span></dt><dd><p>
  11. Do not throw an error if the schema does not exist. A notice is issued
  12. in this case.
  13. </p></dd><dt><span class="term"><em class="replaceable"><code>name</code></em></span></dt><dd><p>
  14. The name of a schema.
  15. </p></dd><dt><span class="term"><code class="literal">CASCADE</code></span></dt><dd><p>
  16. Automatically drop objects (tables, functions, etc.) that are
  17. contained in the schema,
  18. and in turn all objects that depend on those objects
  19. (see <a class="xref" href="ddl-depend.html" title="5.14. Dependency Tracking">Section 5.14</a>).
  20. </p></dd><dt><span class="term"><code class="literal">RESTRICT</code></span></dt><dd><p>
  21. Refuse to drop the schema if it contains any objects. This is
  22. the default.
  23. </p></dd></dl></div></div><div class="refsect1" id="id-1.9.3.129.7"><h2>Notes</h2><p>
  24. Using the <code class="literal">CASCADE</code> option might make the command
  25. remove objects in other schemas besides the one(s) named.
  26. </p></div><div class="refsect1" id="id-1.9.3.129.8"><h2>Examples</h2><p>
  27. To remove schema <code class="literal">mystuff</code> from the database,
  28. along with everything it contains:
  29. </p><pre class="programlisting">
  30. DROP SCHEMA mystuff CASCADE;
  31. </pre></div><div class="refsect1" id="id-1.9.3.129.9"><h2>Compatibility</h2><p>
  32. <code class="command">DROP SCHEMA</code> is fully conforming with the SQL
  33. standard, except that the standard only allows one schema to be
  34. dropped per command, and apart from the
  35. <code class="literal">IF EXISTS</code> option, which is a <span class="productname">PostgreSQL</span>
  36. extension.
  37. </p></div><div class="refsect1" id="id-1.9.3.129.10"><h2>See Also</h2><span class="simplelist"><a class="xref" href="sql-alterschema.html" title="ALTER SCHEMA"><span class="refentrytitle">ALTER SCHEMA</span></a>, <a class="xref" href="sql-createschema.html" title="CREATE SCHEMA"><span class="refentrytitle">CREATE SCHEMA</span></a></span></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="sql-droprule.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="sql-commands.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="sql-dropsequence.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">DROP RULE </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> DROP SEQUENCE</td></tr></table></div></body></html>
上海开阖软件有限公司 沪ICP备12045867号-1