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+<div class=fancy>
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+<div class="fancy_title">
+The CSV Virtual Table
+</div>
+</div>
+
+
+
+
+<h1 id="overview"><span>1. </span>Overview</h1>
+
+<p>
+The CSV virtual table reads
+<a href="https://www.ietf.org/rfc/rfc4180.txt">RFC 4180</a> formatted comma-separated
+values, and returns that content as if it were rows and columns of an SQL
+table.
+</p>
+
+<p>
+The CSV virtual table is useful to applications that need to bulk-load
+large amounts of comma-separated value content.
+The CSV virtual table is also useful as a template source file for
+implementing other virtual tables.
+</p>
+
+
+<p>
+The CSV virtual table is not built into the SQLite amalgamation.
+It is available as a
+<a href="https://www.sqlite.org/src/artifact?ci=trunk&filename=ext/misc/csv.c">separate source file</a>
+that can be compiled into a <a href="loadext.html">loadable extension</a>.
+Typical usage of the CSV virtual table from the
+<a href="cli.html">command-line shell</a> would be something like this:
+
+</p><div class="codeblock"><pre>.load ./csv
+CREATE VIRTUAL TABLE temp.t1 USING csv(filename='thefile.csv');
+SELECT * FROM t1;
+</pre></div>
+
+<p>
+The first line of the script above causes the <a href="cli.html">command-line shell</a> to
+read and activate the run-time loadable extension for CSV.  For an
+application, the equivalent C-language API is
+<a href="c3ref/load_extension.html">sqlite3_load_extension()</a>.
+Observe that the filename extension (ex: ".dll" or ".so" or ".dylib") is
+omitted from the extension filename.  Omitting the filename extension is
+not required, but it helps in making the script cross-platform.  SQLite
+will automatically append the appropriate extension.
+
+</p><p>
+The second line above creates a virtual table named "t1" that reads
+the content of the file named in the argument.  The number and names of
+the columns is determined automatically by reading the first line of
+content.  Other options to the CSV virtual table provide the ability to
+take the CSV content from a string rather than a separate file, and give 
+the programmer more control over the number and names of the columns.
+The options are detailed below.  The CSV virtual table is usually
+created as a TEMP table so that it exists only for the current database
+connection and does not become a permanent part of the database schema.
+Note that there is no "CREATE TEMP VIRTUAL TABLE" command in SQLite.
+Instead, prepend the "temp." schema prefix to the name of the virtual
+table.
+
+</p><p>
+The third line of the example shows the virtual table being used, to read
+all content of the CSV file.  This is perhaps the simplest possible use
+of the virtual table.  The CSV virtual table can be used anywhere an ordinary
+virtual table can be used.  One can use the CSV virtual table inside subqueries,
+or <a href="lang_with.html">common table expressions</a> or add WHERE, GROUP BY, HAVING, ORDER BY,
+and LIMIT clauses as required.
+
+</p><h1 id="arguments"><span>2. </span>Arguments</h1>
+
+<p>
+The example above showed a single <b>filename='thefile.csv'</b> argument
+for the CSV virtual table.  But other arguments are also possible.
+
+</p><ul>
+<li><p><b>filename=</b><i>FILENAME</i>
+</p><p>The <b>filename=</b> argument specifies an external file from which
+CSV content is read.  Every CSV virtual table must have either a 
+<b>filename=</b> argument or a <b>data=</b> argument and not both.
+
+</p></li><li><p><b>data=</b><i>TEXT</i>
+</p><p>The <b>data=</b> argument specifies that <i>TEXT</i> is the literal
+content of the CSV file.
+
+</p></li><li><p><b>schema=</b><i>SCHEMA</i>
+</p><p> The <b>schema=</b> argument specifies a <a href="lang_createtable.html">CREATE TABLE</a> statement that
+the CSV virtual table passes to the <a href="c3ref/declare_vtab.html">sqlite3_declare_vtab()</a> interface in
+order to define the names of the columns in the virtual table.
+
+</p></li><li><p><b>columns=</b><i>N</i>
+</p><p>The <b>columns=</b><i>N</i> argument specifies the number of columns
+in the CSV file.
+If the input data contains more columns than this,
+then the excess columns are ignored.  If the input data contains fewer columns,
+then extra columns are filled with NULL.
+If the <b>columns=</b><i>N</i> argument is omitted, the first line of the
+CSV file is read to determine the number of columns.
+
+</p></li><li><p><b>header=</b><i>BOOLEAN</i><br>
+or just<br>
+<b>header</b>
+</p><p>If the <b>header</b> argument is true then the first row of the CSV file
+to be treated as a header rather than as data.  The second line of the CSV
+file becomes the first row of content.
+If the <b>schema=</b> options is omitted, then the first line of the CSV
+file determines the names of the columns.
+</p></li></ul>
+
+<h1 id="column_names"><span>3. </span>Column Names</h1>
+
+<p>
+The column names of the virtual table are determined primarily by the
+<b>schema=</b> argument.
+If the <b>schema=</b> argument is omitted, but <b>header</b> is true, then
+the values found in the first line of the CSV file become the column names.
+If the <b>schema=</b> argument is omitted and <b>header</b> is false, then
+the columns are named "c0", "c1", "c2", and so forth.
+</p><p align="center"><small><i>This page last modified on  <a href="https://sqlite.org/docsrc/honeypot" id="mtimelink"  data-href="https://sqlite.org/docsrc/finfo/pages/csv.in?m=5f8e2137c1">2022-01-08 05:02:57</a> UTC </small></i></p>
+