Documentation Source Text

      <a href="http://www.sqlite.org/src/timeline">
      http://www.sqlite.org/src/timeline</a>.</p>
    }
    hd_close_aux
    hd_enable_main 1
  }
}



































chng {2013-01-09 (3.7.15.2)} {
<li>Fix a bug, introduced in [version 3.7.15], that causes an ORDER BY clause
    to be optimized out of a three-way join when the ORDER BY is actually
    required.	
    Ticket [http://www.sqlite.org/src/info/598f5f7596b055 | 598f5f7596b055]

      <a href="http://www.sqlite.org/src/timeline">
      http://www.sqlite.org/src/timeline</a>.</p>
    }
    hd_close_aux
    hd_enable_main 1
  }
}

chng {2013-03-12 (3.7.16)} {
<li>Added the [PRAGMA foreign_key_check] command.
<li>Added new extended error codes for all SQLITE_CONSTRAINT errors
<li>Improved optimization of queries containing aggregate min() or max().
<li>Enhance virtual tables so that they can potentially use an index when
    the WHERE clause contains the IN operator.
<li>Allow indices to be used for sorting even if prior terms of the index
    are constrained by IN operators in the WHERE clause.
<li>Enhance the [PRAGMA table_info] command so that the "pk" column is an
    increasing integer to show the order of columns in the primary key.
<li>Enhance the query optimizer to exploit transitive join constraints.
<li>Performance improvements in the query optimizer.
<li>Allow the error message from [PRAGMA integrity_check] to be longer than
    20000 bytes.
<li>Improved name resolution for deeply nested queries.
<li>Added the test_regexp.c module as a demonstration of how to implement
    the REGEXP operator.
<li>Improved error messages in the [RTREE] extension.
<li>Enhance the [command-line shell] so that a non-zero argument to the
    ".exit" command causes the shell to exist immediately without cleanly
    shutting down the database connection.
<li>Improved error messages for invalid boolean arguments to dot-commands
    in the [command-line shell].
<li>Remove all uses of umask() in the unix VFS.
<li>Added the [PRAGMA vdbe_debug] command.

<li>Bug fix: Issue an error message if the 16-bit reference counter on a
    view overflows due to an overly complex query.
<li>Bug fix: Avoid leaking memory on LIMIT and OFFSET clauses in deeply
    nested UNION ALL queries.
<li>Bug fix: Make sure the schema is up-to-date prior to running pragmas
    table_info, index_list, index_info, and foreign_key_list.
}

chng {2013-01-09 (3.7.15.2)} {
<li>Fix a bug, introduced in [version 3.7.15], that causes an ORDER BY clause
    to be optimized out of a three-way join when the ORDER BY is actually
    required.	
    Ticket [http://www.sqlite.org/src/info/598f5f7596b055 | 598f5f7596b055]

</td>
<td width="20"></td><td bgcolor="#044a64" width="1"></td><td width="20"></td>
<td valign="top">
<h3>Current Status</h3>

<p><ul>
<li><a href="releaselog/3_7_15_2.html">Version 3.7.15.2</a>
of SQLite is recommended for all new development.

Upgrading from all other SQLite versions
is recommended.</li>
</ul></p>

<h3>Common Links</h3>

<p><ul>

</td>
<td width="20"></td><td bgcolor="#044a64" width="1"></td><td width="20"></td>
<td valign="top">
<h3>Current Status</h3>

<p><ul>
<li><a href="releaselog/3_7_16.html">Version 3.7.16</a>
of SQLite is recommended for all new development.
Upgrading from version 3.7.15.2 is optional.
Upgrading from all other SQLite versions
is recommended.</li>
</ul></p>

<h3>Common Links</h3>

<p><ul>

Pragma foreign_key_list {
    <p>^(<b>PRAGMA foreign_key_list(</b><i>table-name</i><b>);</b></p>

    <p>This pragma returns one row for each foreign key that references
    a column in the argument table.)^
}
















Pragma freelist_count {
    <p>^(<b>PRAGMA freelist_count;</b></p>
    <p>Return the number of unused pages in the database file.)^</p>
}

Pragma index_info {
................................................................................
}

Pragma table_info {
    <p>^(<b>PRAGMA table_info(</b><i>table-name</i><b>);</b></p>
    <p>This pragma returns one row for each column in the named table.)^
    ^Columns in the result set include the column name,
    data type, whether or not the column can be NULL, and the default
    value for the column.</p>



}

Pragma {schema_version user_version} {
    <p><b>PRAGMA schema_version; 
       <br>PRAGMA schema_version = </b><i>integer </i><b>;
       <br>PRAGMA user_version;
       <br>PRAGMA user_version = </b><i>integer </i><b>;</b>
................................................................................
    <p>If SQLite has been compiled with the [SQLITE_DEBUG] compile-time
    option, then the vdbe_listing pragma can be used to cause a complete
    listing of the virtual machine opcodes to appear on standard output
    as each statement is evaluated.
    With listing is on, the entire content of a program is printed
    just prior to beginning execution.  The statement
    executes normally after the listing is printed.


















    This feature is used for debugging SQLite itself.  See the 
    <a href="vdbe.html#trace">VDBE documentation</a> for more 
    information.</p>
}

Pragma wal_checkpoint {
    <p><b>PRAGMA </b><i>database</i><b>.wal_checkpoint;</b><br>

Pragma foreign_key_list {
    <p>^(<b>PRAGMA foreign_key_list(</b><i>table-name</i><b>);</b></p>

    <p>This pragma returns one row for each foreign key that references
    a column in the argument table.)^
}

Pragma foreign_key_check {
    <p>^(<b>PRAGMA foreign_key_check;)^</b></p>

    <p>The foreign_key_check pragma checks the database for 
    [foreign key constraints] that are violated and returns one row of
    output for each violation.  There are four columns in each result row.
    The first column is the name of the table that contains the REFERENCES
    clause.  The second column is the [rowid] of the row the that that
    contains the invalid REFERENCES clause.  The third column is the name
    of the table that is referred to. The fourth column is the index of
    the specific foreign key constraint that failed.  The fourth column
    in the output of the foreign_key_check pragma is the same integer as
    the first column in the output of the foreign_key_list pragma.</p>
}

Pragma freelist_count {
    <p>^(<b>PRAGMA freelist_count;</b></p>
    <p>Return the number of unused pages in the database file.)^</p>
}

Pragma index_info {
................................................................................
}

Pragma table_info {
    <p>^(<b>PRAGMA table_info(</b><i>table-name</i><b>);</b></p>
    <p>This pragma returns one row for each column in the named table.)^
    ^Columns in the result set include the column name,
    data type, whether or not the column can be NULL, and the default
    value for the column.  ^The "pk" column in the result set is zero
    for columns that are not part of the primary key, and is the index of
    the column in the primary key for columns that are part of the primary
    key.</p>
}

Pragma {schema_version user_version} {
    <p><b>PRAGMA schema_version; 
       <br>PRAGMA schema_version = </b><i>integer </i><b>;
       <br>PRAGMA user_version;
       <br>PRAGMA user_version = </b><i>integer </i><b>;</b>
................................................................................
    <p>If SQLite has been compiled with the [SQLITE_DEBUG] compile-time
    option, then the vdbe_listing pragma can be used to cause a complete
    listing of the virtual machine opcodes to appear on standard output
    as each statement is evaluated.
    With listing is on, the entire content of a program is printed
    just prior to beginning execution.  The statement
    executes normally after the listing is printed.
    This feature is used for debugging SQLite itself.  See the 
    <a href="vdbe.html#trace">VDBE documentation</a> for more 
    information.</p>
}

DebugPragma vdbe_debug {
    <p><b>PRAGMA vdbe_debug = </b><i>boolean</i><b>;</b></p>

    DISCLAIMER

    <p>If SQLite has been compiled with the [SQLITE_DEBUG] compile-time
    option, then the vdbe_debug pragma can be used to cause a complete
    listing of the virtual machine opcodes to appear on standard output
    as each statement is evaluated, and to cause each to cause virtual
    machine opcodes to be printed on standard output as they are evaluated.
    (In other words, vdbe_debug is a combination of vdbe_listing and
    vdbe_trace.)  In addition, the vdbe_debug pragma also enables tracing
    of calls to sqlite3VdbeAddOp() during code generation.
    This feature is used for debugging SQLite itself.  See the 
    <a href="vdbe.html#trace">VDBE documentation</a> for more 
    information.</p>
}

Pragma wal_checkpoint {
    <p><b>PRAGMA </b><i>database</i><b>.wal_checkpoint;</b><br>