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Overview
Comment:Pickup the SQLite core library 3.16.1 docs from upstream.
Downloads: Tarball | ZIP archive
Timelines: family | ancestors | descendants | both | core316
Files: files | file ages | folders
SHA1: cd3c821bce3027448b4767155fe82d0ac11db1f6
User & Date: mistachkin 2017-01-03 20:38:39.658
Context
2017-01-03
22:50
Update SQLite core library to the 3.16.1 release. Pickup the SQLite core library 3.16.1 docs from upstream. check-in: e355996800 user: mistachkin tags: trunk
20:38
Pickup the SQLite core library 3.16.1 docs from upstream. Closed-Leaf check-in: cd3c821bce user: mistachkin tags: core316
20:37
Update SQLite core library to the 3.16.1 release. check-in: a651e42bb6 user: mistachkin tags: core316
Changes
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as a Julian day number as it normally would be, but as
<a href="http://en.wikipedia.org/wiki/Unix_time">Unix Time</a> - the 
number of seconds since 1970.  If the "unixepoch" modifier does not
follow a timestring of the form DDDDDDDDDD which expresses the number
of seconds since 1970 or if other modifiers
separate the "unixepoch" modifier from prior DDDDDDDDDD then the
behavior is undefined.
Due to precision limitations imposed by the implementations use
of 64-bit integers, the "unixepoch" modifier only works for
dates between 0000-01-01 00:00:00 and 5352-11-01 10:52:47 (unix times
of -62167219200 through 106751991167).</p>

<a name="localtime"></a>

<p>The "localtime" modifier (12) assumes the time string to its left is in
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as a Julian day number as it normally would be, but as
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follow a timestring of the form DDDDDDDDDD which expresses the number
of seconds since 1970 or if other modifiers
separate the "unixepoch" modifier from prior DDDDDDDDDD then the
behavior is undefined.
For SQLite versions before 3.16.0 (2017-01-02), 
the "unixepoch" modifier only works for
dates between 0000-01-01 00:00:00 and 5352-11-01 10:52:47 (unix times
of -62167219200 through 106751991167).</p>

<a name="localtime"></a>

<p>The "localtime" modifier (12) assumes the time string to its left is in
Universal Coordinated Time (UTC) and adjusts the time
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<li>CASE WHEN x=w1 THEN r1 WHEN x=w2 THEN r2 ELSE r3 END
</pre></ul>


<a name="in_op"></a>

<h3>The IN and NOT IN operators</h3>
<p>The IN and NOT IN operators take a single scalar operand on the
left and a vector operand on the right
formed by an explicit list of zero or more scalars or by a 
single subquery.
When the right operand of an IN or NOT IN operator is a subquery, the
subquery must have a single result column.






The "subquery" on the right-hand side of an IN operator can be a
table name or <a href="vtab.html#tabfunc2">table-valued function</a> name in which case the

subquery is understood to be "(SELECT * FROM <i>name</i>)".
When the right operand is an empty set, the result of IN is false and the
result of NOT IN is true, regardless of the left operand and even if the
left operand is NULL.
<p>The result of an IN or NOT IN operator is determined by the following
matrix:

<center>








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<li>CASE WHEN x=w1 THEN r1 WHEN x=w2 THEN r2 ELSE r3 END
</pre></ul>


<a name="in_op"></a>

<h3>The IN and NOT IN operators</h3>
<p>The IN and NOT IN operators take an expression on the
left and a list of values or a subquery on the right.


When the right operand of an IN or NOT IN operator is a subquery, the
subquery must have the same number of columns as there are columns in
the <a href="rowvalue.html">row value</a> of the left operand.  The subquery on the
right of an IN or NOT IN operator must be a scalar subquery if the left
expression is not a <a href="rowvalue.html">row value</a> expression.
If the right operand of an IN or NOT IN operator is a list of values,
each of those values must be scalars and the left expression must also
be a scalar.
The right-hand side of an IN or NOT IN operator can be a
table <i>name</i> or <a href="vtab.html#tabfunc2">table-valued function</a> <i>name</i> in which 
case the right-hand side is understood to be subquery of
the form "(SELECT * FROM <i>name</i>)".
When the right operand is an empty set, the result of IN is false and the
result of NOT IN is true, regardless of the left operand and even if the
left operand is NULL.
<p>The result of an IN or NOT IN operator is determined by the following
matrix:

<center>
︙︙
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</center>

<p>Note that SQLite allows the parenthesized list of scalar values on
the right-hand side of an IN or NOT IN operator to be an empty list but
most other SQL database database engines and the SQL92 standard require
the list to contain at least one element.</p>














<a name="in_op"></a>

<h3>The EXISTS operator</h3>

<p>The EXISTS operator always evaluates to one of the integer values 0 
and 1. If executing the SELECT statement specified as the right-hand 
operand of the EXISTS operator would return one or more rows, then the
EXISTS operator evaluates to 1. If executing the SELECT would return
no rows at all, then the EXISTS operator evaluates to 0. 

<p>The number of columns in each row returned by the SELECT statement
(if any) and the specific values returned have no effect on the results
of the EXISTS operator. In particular, rows containing NULL values are
not handled any differently from rows without NULL values.

<a name="subq"></a>

<h3>Scalar Subqueries</h3>

<p>A <a href="lang_select.html">SELECT</a> statement enclosed in parentheses may appear as a scalar
quantity. A <a href="lang_select.html">SELECT</a> used as a scalar quantity must return a result set
with a single column. The result of the expression is the value of the
only column in the first row returned by the SELECT statement. If the SELECT 
yields more than one result row, all rows after the first are ignored. If
the SELECT yields no rows, then the value of the expression is NULL.
The LIMIT of a scalar subquery is always 1.
Any other LIMIT value given in the SQL text is ignored.

<p>All types of <a href="lang_select.html">SELECT</a> statement, including aggregate and <a href="lang_select.html#compound">compound SELECT</a>
queries (queries with keywords like UNION or EXCEPT) are allowed as scalar


subqueries.

<h3>Table Column Names</h3>

<p>A column name can be any of the names defined in the <a href="lang_createtable.html">CREATE TABLE</a>
statement or one of the following special identifiers: "<b>ROWID</b>",
"<b>OID</b>", or "<b>_ROWID_</b>".
The three special identifiers describe the
unique integer key (the <a href="lang_createtable.html#rowid">rowid</a>) associated with every 
row of every table and so are not available on <a href="withoutrowid.html">WITHOUT ROWID</a> tables.
The special identifiers only refer to the row key if the <a href="lang_createtable.html">CREATE TABLE</a>
statement does not define a real column with the same name.
The rowid can be used anywhere a regular
column can be used.</p>


<a name="cosub"></a>

<h3>Correlated Subqueries</h3>

<p>A <a href="lang_select.html">SELECT</a> statement used as either a scalar subquery or as the 
right-hand operand of an IN, NOT IN or EXISTS expression may contain 








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</center>

<p>Note that SQLite allows the parenthesized list of scalar values on
the right-hand side of an IN or NOT IN operator to be an empty list but
most other SQL database database engines and the SQL92 standard require
the list to contain at least one element.</p>

<h3>Table Column Names</h3>

<p>A column name can be any of the names defined in the <a href="lang_createtable.html">CREATE TABLE</a>
statement or one of the following special identifiers: "<b>ROWID</b>",
"<b>OID</b>", or "<b>_ROWID_</b>".
The three special identifiers describe the
unique integer key (the <a href="lang_createtable.html#rowid">rowid</a>) associated with every 
row of every table and so are not available on <a href="withoutrowid.html">WITHOUT ROWID</a> tables.
The special identifiers only refer to the row key if the <a href="lang_createtable.html">CREATE TABLE</a>
statement does not define a real column with the same name.
The rowid can be used anywhere a regular
column can be used.</p>

<a name="in_op"></a>

<h3>The EXISTS operator</h3>

<p>The EXISTS operator always evaluates to one of the integer values 0 
and 1. If executing the SELECT statement specified as the right-hand 
operand of the EXISTS operator would return one or more rows, then the
EXISTS operator evaluates to 1. If executing the SELECT would return
no rows at all, then the EXISTS operator evaluates to 0. 

<p>The number of columns in each row returned by the SELECT statement
(if any) and the specific values returned have no effect on the results
of the EXISTS operator. In particular, rows containing NULL values are
not handled any differently from rows without NULL values.

<a name="subq"></a>

<h3>Subquery Expressions</h3>

<p>A <a href="lang_select.html">SELECT</a> statement enclosed in parentheses is a subquery.


All types of SELECT statement, including

aggregate and compound SELECT queries (queries with keywords like
UNION or EXCEPT) are allowed as scalar subqueries.

The value of a subquery expression is the first row of the result
from the enclosed <a href="lang_select.html">SELECT</a> statement.

In other words, an implied "LIMIT 1" is added to the subquery, overriding
an explicitly coded LIMIT.
The value of a subquery expression is NULL if the enclosed
<a href="lang_select.html">SELECT</a> statement returns no rows.









<p>A subquery that returns a single column is a scalar subquery and can
be used most anywhere.
A subquery that returns two or more columns is a <a href="rowvalue.html">row value</a>
subquery and can only be used as the operand of a comparison operator.

<a name="cosub"></a>

<h3>Correlated Subqueries</h3>

<p>A <a href="lang_select.html">SELECT</a> statement used as either a scalar subquery or as the 
right-hand operand of an IN, NOT IN or EXISTS expression may contain
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<p>If the FROM clause is omitted from a simple SELECT statement, then the 
input data is implicitly a single row zero columns wide (i.e. <i>N</i>=1 and
<i>M</i>=0).

<p>If a FROM clause is specified, the data on which a simple SELECT query
operates comes from the one or more tables or subqueries (SELECT statements
in parenthesis) specified following the FROM keyword. A subquery specified
in the table-or-subquery following the FROM clause in a 
simple SELECT statement is
handled as if it was a table containing the data returned by executing the
subquery statement. Each column of the subquery has the
<a href="datatype3.html#collation">collation sequence</a> and <a href="datatype3.html#affinity">affinity</a> of the corresponding expression
in the subquery statement.

<p>If there is only a single table or subquery in the FROM








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<p>If the FROM clause is omitted from a simple SELECT statement, then the 
input data is implicitly a single row zero columns wide (i.e. <i>N</i>=1 and
<i>M</i>=0).

<p>If a FROM clause is specified, the data on which a simple SELECT query
operates comes from the one or more tables or subqueries (SELECT statements
in parenthesis) specified following the FROM keyword. A subquery specified
in the <span class='yyterm'>table-or-subquery</span> following the FROM clause in a 
simple SELECT statement is
handled as if it was a table containing the data returned by executing the
subquery statement. Each column of the subquery has the
<a href="datatype3.html#collation">collation sequence</a> and <a href="datatype3.html#affinity">affinity</a> of the corresponding expression
in the subquery statement.

<p>If there is only a single table or subquery in the FROM
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    <p>Each group of input dataset rows contributes a single row to the 
    set of result rows. Subject to filtering associated with the DISTINCT
    keyword, the number of rows returned by an aggregate query with a GROUP
    BY clause is the same as the number of groups of rows produced by applying
    the GROUP BY and HAVING clauses to the filtered input dataset.
</ul>









































<p><b>4. Removal of duplicate rows (DISTINCT processing).</b>
<a name="distinct"></a>



<p>One of the ALL or DISTINCT keywords may follow the SELECT keyword in a 
simple SELECT statement. If the simple SELECT is a SELECT ALL, then the
entire set of result rows are returned by the SELECT. If neither ALL or
DISTINCT are present, then the behavior is as if ALL were specified. 
If the simple SELECT is a SELECT DISTINCT, then duplicate rows are removed
from the set of result rows before it is returned. For the purposes of
detecting duplicate rows, two NULL values are considered to be equal. The

normal rules for selecting a collation sequence to compare text values with
apply.

<a name="compound"></a>

<h3>Compound Select Statements</h3>

<p>Two or more <a href="lang_select.html#simpleselect">simple SELECT</a> statements may be connected together to form
a compound SELECT using the UNION, UNION ALL, INTERSECT or EXCEPT operator,








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    <p>Each group of input dataset rows contributes a single row to the 
    set of result rows. Subject to filtering associated with the DISTINCT
    keyword, the number of rows returned by an aggregate query with a GROUP
    BY clause is the same as the number of groups of rows produced by applying
    the GROUP BY and HAVING clauses to the filtered input dataset.
</ul>

<a name="bareagg"></a>

<p><b>Side note: Bare columns in an aggregate queries.</b>
The usual case is that all column names in an aggregate query are either
arguments to <a href="lang_aggfunc.html">aggregate functions</a> or else appear in the GROUP BY clause.
A result column which contains a column name that is not within an
aggregate function and that does not appear in the GROUP BY clause (if
one exists) is called a "bare" column.
Example:
<blockquote><pre>
SELECT a, b, sum(c) FROM tab1 GROUP BY a;
</pre></blockquote>
<p>In the query above, the "a" column is part of the GROUP BY clause
and so each row of the output contains one of the distinct values for
"a".  The "c" column is contained within the <a href="lang_aggfunc.html#sumunc">sum()</a> aggregate function
and so that output column is the sum of all "c" values in rows that
have the same value for "a".  But what is the result of the bare 
column "b"? The answer is that the "b" result will be the
value for "b" in one of the input rows that form the aggregate.
The problem is that you usually do not know which input row is used
to compute "b", and so in many cases the value for "b" is undefined.
</p>
<p>
Special processing occurs occurs when the aggregate function is 
either <a href="lang_aggfunc.html#maxggunc">min()</a> or <a href="lang_aggfunc.html#minggunc">max()</a>.  Example:
<blockquote><pre>
SELECT a, b, max(c) FROM tab1 GROUP BY a;
</pre></blockquote>
When the <a href="lang_aggfunc.html#maxggunc">min()</a> or <a href="lang_aggfunc.html#minggunc">max()</a> aggregate functions 
are used in an aggregate query, all bare columns in the result set 
take values from the input
row which also contains the minimum or maximum.  So in the query
above, the value of the "b" column in the output will be the value of
the "b" column in the input row that has the largest "c" value.
There is still an ambiguity if two or more of the input rows have the
same minimum or maximum value or if the query contains more than one
min() and/or max() aggregate function. Only the built-in <a href="lang_aggfunc.html#minggunc">min()</a> 
and <a href="lang_aggfunc.html#maxggunc">max()</a> functions work this way.
</p>

<p><b>4. Removal of duplicate rows (DISTINCT processing).</b>
<a name="distinct"></a>



<p>One of the ALL or DISTINCT keywords may follow the SELECT keyword in a 
simple SELECT statement. If the simple SELECT is a SELECT ALL, then the
entire set of result rows are returned by the SELECT. If neither ALL or
DISTINCT are present, then the behavior is as if ALL were specified. 
If the simple SELECT is a SELECT DISTINCT, then duplicate rows are removed
from the set of result rows before it is returned. For the purposes of
detecting duplicate rows, two NULL values are considered to be equal. The
<a href="datatype3.html#colrules">usual rules</a> apply for selecting a collation
sequence to compare text values.


<a name="compound"></a>

<h3>Compound Select Statements</h3>

<p>Two or more <a href="lang_select.html#simpleselect">simple SELECT</a> statements may be connected together to form
a compound SELECT using the UNION, UNION ALL, INTERSECT or EXCEPT operator,
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if( !location.origin.match(/http/) ){
document.getElementById("search_menubutton").style.display = "none";
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    <a href="c3ref/step.html">sqlite3_step()</a>, <a href="c3ref/finalize.html">sqlite3_finalize()</a> API (or similar in a wrapper 
    interface), the pragma may run during the <a href="c3ref/prepare.html">sqlite3_prepare()</a> call,
    not during the <a href="c3ref/step.html">sqlite3_step()</a> call as normal SQL statements do.
    Or the pragma might run during sqlite3_step() just like normal
    SQL statements.  Whether or not the pragma runs during sqlite3_prepare()
    or sqlite3_step() depends on the pragma and on the specific release
    of SQLite.
<li>The pragma command is specific to SQLite and is very unlikely 
    to be compatible with any other SQL database engine.
</ul>

<p>The C-language API for SQLite provides the <a href="c3ref/c_fcntl_busyhandler.html#sqlitefcntlpragma">SQLITE_FCNTL_PRAGMA</a>
<a href="c3ref/file_control.html">file control</a> which gives <a href="vfs.html">VFS</a> implementations the
opportunity to add new PRAGMA statements or to override the meaning of
built-in PRAGMA statements.</p>









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    <a href="c3ref/step.html">sqlite3_step()</a>, <a href="c3ref/finalize.html">sqlite3_finalize()</a> API (or similar in a wrapper 
    interface), the pragma may run during the <a href="c3ref/prepare.html">sqlite3_prepare()</a> call,
    not during the <a href="c3ref/step.html">sqlite3_step()</a> call as normal SQL statements do.
    Or the pragma might run during sqlite3_step() just like normal
    SQL statements.  Whether or not the pragma runs during sqlite3_prepare()
    or sqlite3_step() depends on the pragma and on the specific release
    of SQLite.
<li>The pragma command is specific to SQLite and is
    not compatible with any other SQL database engine.
</ul>

<p>The C-language API for SQLite provides the <a href="c3ref/c_fcntl_busyhandler.html#sqlitefcntlpragma">SQLITE_FCNTL_PRAGMA</a>
<a href="c3ref/file_control.html">file control</a> which gives <a href="vfs.html">VFS</a> implementations the
opportunity to add new PRAGMA statements or to override the meaning of
built-in PRAGMA statements.</p>
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or "main" or "temp" for the main and the TEMP databases.  If the optional
schema name is omitted, "main" is assumed.  In some pragmas, the schema
name is meaningless and is simply ignored.  In the documentation below,
pragmas for which the schema name is meaningful are shown with a
"<i>schema.</i>" prefix.</p>









































































<hr /><a name="toc"></a>
<h2>List Of PRAGMAs</h2>
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or "main" or "temp" for the main and the TEMP databases.  If the optional
schema name is omitted, "main" is assumed.  In some pragmas, the schema
name is meaningless and is simply ignored.  In the documentation below,
pragmas for which the schema name is meaningful are shown with a
"<i>schema.</i>" prefix.</p>


<hr /><a name="pragfunc"></a>
<h2>PRAGMA functions</h2>


<p>
PRAGMAs that return results and that have no side-effects can be 
accessed from ordinary <a href="lang_select.html">SELECT</a> statements as <a href="vtab.html#tabfunc2">table-valued functions</a>.
For each participating PRAGMA, the corresponding table-valued function
has the same name as the PRAGMA with a 7-character "pragma_" prefix.
The PRAGMA argument and schema, if any, are passed as arguments to
the table-valued function.

<p>For example, information about the columns in an index can be
read using the <a href="pragma.html#pragma_index_info">index_info pragma</a> as follows:

<blockquote><pre>
PRAGMA index_info('idx52');
</pre></blockquote>

<p>Or, the same content can be read using:

<blockquote><pre>
SELECT * FROM pragma_index_info('idx52');
</pre></blockquote>

<p>The advantage of the table-valued function format is that the query
can return just a subset of the PRAGMA columns, can include a WHERE clause,
can use aggregate functions, and the table-valued function can be just
one of several data sources in a join.
For example, to get a list of all indexed columns in a schema, one
could query:

<blockquote><pre>
SELECT DISTINCT m.name || '.' || ii.name AS 'indexed-columns'
  FROM sqlite_master AS m,
       pragma_index_list(m.name) AS il,
       pragma_index_info(il.name) AS ii
 WHERE m.type='table'
 ORDER BY 1;
</pre></blockquote>

<p>
Additional notes:
<ul>
<li><p>
Table-valued functions exist only for built-in PRAGMAs, not for PRAGMAs
defined using the <a href="c3ref/c_fcntl_busyhandler.html#sqlitefcntlpragma">SQLITE_FCNTL_PRAGMA</a> file control.
<li><p>
Table-valued functions exist only for PRAGMAs that return results and
that have no side-effects.
<li><p>
This feature could be used to implement
<a href="https://en.wikipedia.org/wiki/Information_schema">information schema</a>
by first creating a separate schema using
<blockquote><pre>
<a href="lang_attach.html">ATTACH</a> ':memory:' AS 'information_schema';
</pre></blockquote>
Then creating
<a href="lang_createview.html">VIEWs</a> in that schema that implement the official information schema
tables using table-valued PRAGMA functions.
<li><p>
This feature is experimental and is subject to change.  Further documentation
will become available if and when the table-valued functions for PRAGMAs
feature becomes officially supported.
<li><p>
The table-valued functions for PRAGMA feature was added
in SQLite version 3.16.0 (2017-01-02).  Prior versions of SQLite
cannot use this feature.
</ul>


<hr /><a name="toc"></a>
<h2>List Of PRAGMAs</h2>
<style>
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    <p><b>PRAGMA ignore_check_constraints  = </b><i>boolean</i><b>;</b></p>

    <p>This pragma enables or disables the enforcement of CHECK constraints.
    The default setting is off, meaning that CHECK constraints are
    enforced by default.</p>
<a name="pragma_incremental_vacuum"></a>
<h _id=pragma_incremental_vacuum style="display:none"> PRAGMA incremental_vacuum</h><hr>
    <p><b>PRAGMA </b><i>schema.</i><b>incremental_vacuum</b><i>(N)</i><b>;</b></p>

    <p>The incremental_vacuum pragma causes up to <i>N</i> pages to
    be removed from the <a href="fileformat2.html#freelist">freelist</a>.  The database file is truncated by
    the same amount.  The incremental_vacuum pragma has no effect if
    the database is not in
    <a href="#pragma_auto_vacuum">auto_vacuum=incremental</a> mode
    or if there are no pages on the freelist.  If there are fewer than
    <i>N</i> pages on the freelist, or if <i>N</i> is less than 1, or

    if <i>N</i> is omitted entirely, then the entire freelist is cleared.</p>
<a name="pragma_index_info"></a>
<h _id=pragma_index_info style="display:none"> PRAGMA index_info</h><hr>
    <p><b>PRAGMA </b><i>schema.</i><b>index_info(</b><i>index-name</i><b>);</b></p>
    <p>This pragma returns one row for each key column in the named index.
    A key column is a column that is actually named in the <a href="lang_createindex.html">CREATE INDEX</a>
    index statement or <a href="lang_createtable.html#uniqueconst">UNIQUE constraint</a> or <a href="lang_createtable.html#primkeyconst">PRIMARY KEY constraint</a> that
    created the index.  Index entries also usually contain auxiliary








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    <p><b>PRAGMA ignore_check_constraints  = </b><i>boolean</i><b>;</b></p>

    <p>This pragma enables or disables the enforcement of CHECK constraints.
    The default setting is off, meaning that CHECK constraints are
    enforced by default.</p>
<a name="pragma_incremental_vacuum"></a>
<h _id=pragma_incremental_vacuum style="display:none"> PRAGMA incremental_vacuum</h><hr>
    <p><b>PRAGMA </b><i>schema.</i><b>incremental_vacuum</b><i>(N)</i><b>;<br>
      PRAGMA </b><i>schema.</i><b>incremental_vacuum;</b></p>
    <p>The incremental_vacuum pragma causes up to <i>N</i> pages to
    be removed from the <a href="fileformat2.html#freelist">freelist</a>.  The database file is truncated by
    the same amount.  The incremental_vacuum pragma has no effect if
    the database is not in
    <a href="#pragma_auto_vacuum">auto_vacuum=incremental</a> mode
    or if there are no pages on the freelist.  If there are fewer than
    <i>N</i> pages on the freelist, or if <i>N</i> is less than 1, or
    if the "(<i>N</i>)" argument is omitted, then the entire
    freelist is cleared.</p>
<a name="pragma_index_info"></a>
<h _id=pragma_index_info style="display:none"> PRAGMA index_info</h><hr>
    <p><b>PRAGMA </b><i>schema.</i><b>index_info(</b><i>index-name</i><b>);</b></p>
    <p>This pragma returns one row for each key column in the named index.
    A key column is a column that is actually named in the <a href="lang_createindex.html">CREATE INDEX</a>
    index statement or <a href="lang_createtable.html#uniqueconst">UNIQUE constraint</a> or <a href="lang_createtable.html#primkeyconst">PRIMARY KEY constraint</a> that
    created the index.  Index entries also usually contain auxiliary
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