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+<!DOCTYPE html>
+<html><head>
+<meta name="viewport" content="width=device-width, initial-scale=1.0">
+<meta http-equiv="content-type" content="text/html; charset=UTF-8">
+<link href="../sqlite.css" rel="stylesheet">
+<title>SQL Keyword Checking</title>
+<!-- path=../ -->
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+<body>
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+</script>
+<!-- keywords: sqlite3_keyword_check sqlite3_keyword_count sqlite3_keyword_name -->
+<div class=nosearch>
+<a href="../c3ref/intro.html"><h2>SQLite C Interface</h2></a>
+<h2>SQL Keyword Checking</h2>
+</div>
+<blockquote><pre>
+int sqlite3_keyword_count(void);
+int sqlite3_keyword_name(int,const char**,int*);
+int sqlite3_keyword_check(const char*,int);
+</pre></blockquote>
+<p>
+These routines provide access to the set of SQL language keywords
+recognized by SQLite.  Applications can uses these routines to determine
+whether or not a specific identifier needs to be escaped (for example,
+by enclosing in double-quotes) so as not to confuse the parser.</p>
+
+<p>The sqlite3_keyword_count() interface returns the number of distinct
+keywords understood by SQLite.</p>
+
+<p>The sqlite3_keyword_name(N,Z,L) interface finds the N-th keyword and
+makes *Z point to that keyword expressed as UTF8 and writes the number
+of bytes in the keyword into *L.  The string that *Z points to is not
+zero-terminated.  The sqlite3_keyword_name(N,Z,L) routine returns
+SQLITE_OK if N is within bounds and SQLITE_ERROR if not. If either Z
+or L are NULL or invalid pointers then calls to
+sqlite3_keyword_name(N,Z,L) result in undefined behavior.</p>
+
+<p>The sqlite3_keyword_check(Z,L) interface checks to see whether or not
+the L-byte UTF8 identifier that Z points to is a keyword, returning non-zero
+if it is and zero if not.</p>
+
+<p>The parser used by SQLite is forgiving.  It is often possible to use
+a keyword as an identifier as long as such use does not result in a
+parsing ambiguity.  For example, the statement
+"CREATE TABLE BEGIN(REPLACE,PRAGMA,END);" is accepted by SQLite, and
+creates a new table named "BEGIN" with three columns named
+"REPLACE", "PRAGMA", and "END".  Nevertheless, best practice is to avoid
+using keywords as identifiers.  Common techniques used to avoid keyword
+name collisions include:
+<ul>
+<li> Put all identifier names inside double-quotes.  This is the official
+SQL way to escape identifier names.
+<li> Put identifier names inside &#91;...&#93;.  This is not standard SQL,
+but it is what SQL Server does and so lots of programmers use this
+technique.
+<li> Begin every identifier with the letter "Z" as no SQL keywords start
+with "Z".
+<li> Include a digit somewhere in every identifier name.
+</ul></p>
+
+<p>Note that the number of keywords understood by SQLite can depend on
+compile-time options.  For example, "VACUUM" is not a keyword if
+SQLite is compiled with the <a href="../compile.html#omit_vacuum">-DSQLITE_OMIT_VACUUM</a> option.  Also,
+new keywords may be added to future releases of SQLite.
+</p><p>See also lists of
+  <a href="../c3ref/objlist.html">Objects</a>,
+  <a href="../c3ref/constlist.html">Constants</a>, and
+  <a href="../c3ref/funclist.html">Functions</a>.</p>
+