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Overview
Comment:Added typeof() operator. Minor additions for ATTACH/DETACH. (CVS 987)
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SHA1: 8b8fa0fff26107912f0bec4e44df207c7885e273
User & Date: jplyon 2003-05-29 04:21:39.000
Context
2003-05-29
17:43
Modify the windows locking code so that it works correctly for a database being shared between Win95/98/ME and WinNT/2K/XP systems. Ticket #310. (CVS 988) (check-in: 8c402db7e0 user: drh tags: trunk)
04:21
Added typeof() operator. Minor additions for ATTACH/DETACH. (CVS 987) (check-in: 8b8fa0fff2 user: jplyon tags: trunk)
2003-05-19
23:55
Fix segfault that occurs when opening a non-existing database in the shell then immediately doing ".q". (CVS 986) (check-in: e8566cf5a3 user: drh tags: trunk)
Changes
Unified Diff Ignore Whitespace Patch
Changes to www/lang.tcl. 
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#
# Run this Tcl script to generate the sqlite.html file.
#
set rcsid {$Id: lang.tcl,v 1.58 2003/05/17 01:39:40 drh Exp $}

puts {<html>
<head>
  <title>Query Language Understood By SQLite</title>
</head>
<body bgcolor=white>
<h1 align=center>




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#
# Run this Tcl script to generate the sqlite.html file.
#
set rcsid {$Id: lang.tcl,v 1.59 2003/05/29 04:21:39 jplyon Exp $}

puts {<html>
<head>
  <title>Query Language Understood By SQLite</title>
</head>
<body bgcolor=white>
<h1 align=center>
︙︙
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<p>You can read from and write to an attached database, but you cannot 
alter the schema of an attached database.  You can only CREATE and 
DROP in the original database.</p>

<p>You cannot create a new table with the same name as a table in 
an attached database, but you can attach a database which contains
tables whose names are duplicates of tables in the main database.</p>


<p>Tables in an attached database can be referred to using the syntax 
<i>database-name.table-name</i>.  If an attached table doesn't have 
a duplicate table name in the main database, it doesn't require a 
database name prefix.  When a database is attached, all of its 
tables which don't have duplicate names become the 'default' table
of that name.  Any tables of that name attached afterwards require the table 








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<p>You can read from and write to an attached database, but you cannot 
alter the schema of an attached database.  You can only CREATE and 
DROP in the original database.</p>

<p>You cannot create a new table with the same name as a table in 
an attached database, but you can attach a database which contains
tables whose names are duplicates of tables in the main database.  It is 
also permissible to attach the same database file multiple times.</p>

<p>Tables in an attached database can be referred to using the syntax 
<i>database-name.table-name</i>.  If an attached table doesn't have 
a duplicate table name in the main database, it doesn't require a 
database name prefix.  When a database is attached, all of its 
tables which don't have duplicate names become the 'default' table
of that name.  Any tables of that name attached afterwards require the table
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puts {
<p>The CREATE INDEX command consists of the keywords "CREATE INDEX" followed
by the name of the new index, the keyword "ON", the name of a previously
created table that is to be indexed, and a parenthesized list of names of
columns in the table that are used for the index key.
Each column name can be followed by one of the "ASC" or "DESC" keywords
to indicate sort order, but the sort order is ignored in the current
implementation.</p>

<p>There are no arbitrary limits on the number of indices that can be
attached to a single table, nor on the number of columns in an index.</p>

<p>If the UNIQUE keyword appears between CREATE and INDEX then duplicate
index entries are not allowed.  Any attempt to insert a duplicate entry
will result in an error.</p>








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puts {
<p>The CREATE INDEX command consists of the keywords "CREATE INDEX" followed
by the name of the new index, the keyword "ON", the name of a previously
created table that is to be indexed, and a parenthesized list of names of
columns in the table that are used for the index key.
Each column name can be followed by one of the "ASC" or "DESC" keywords
to indicate sort order, but the sort order is ignored in the current
implementation.  Sorting is always done in ascending order.</p>

<p>There are no arbitrary limits on the number of indices that can be
attached to a single table, nor on the number of columns in an index.</p>

<p>If the UNIQUE keyword appears between CREATE and INDEX then duplicate
index entries are not allowed.  Any attempt to insert a duplicate entry
will result in an error.</p>
︙︙
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Section {DETACH DATABASE} detach

Syntax {sql-command} {
DETACH [DATABASE] <database-name>
}

puts {
<p>This statement detaches an additional database file previously attached
using the <a href="#attach">ATTACH DATABASE</a> statement.</p>




<p>This statement will fail if SQLite is in the middle of a transaction.</p>
}


Section {DROP INDEX} dropindex









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Section {DETACH DATABASE} detach

Syntax {sql-command} {
DETACH [DATABASE] <database-name>
}

puts {
<p>This statement detaches an additional database connection previously 
attached using the <a href="#attach">ATTACH DATABASE</a> statement.  It
is possible to have the same database file attached multiple times using 
different names, and detaching one connection to a file will leave the 
others intact.</p>

<p>This statement will fail if SQLite is in the middle of a transaction.</p>
}


Section {DROP INDEX} dropindex
︙︙
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with the <i>Y</i>-th character and which is <i>Z</i> characters long.
The left-most character of <i>X</i> is number 1.  If <i>Y</i> is negative
the the first character of the substring is found by counting from the
right rather than the left.  If SQLite is configured to support UTF-8,
then characters indices refer to actual UTF-8 characters, not bytes.</td>
</tr>








<tr>
<td valign="top" align="right">upper(<i>X</i>)</td>
<td valign="top">Return a copy of input string <i>X</i> converted to all
upper-case letters.  The implementation of this function uses the C library
routine <b>toupper()</b> which means it may not work correctly on 
UTF-8 strings.</td>
</tr>








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with the <i>Y</i>-th character and which is <i>Z</i> characters long.
The left-most character of <i>X</i> is number 1.  If <i>Y</i> is negative
the the first character of the substring is found by counting from the
right rather than the left.  If SQLite is configured to support UTF-8,
then characters indices refer to actual UTF-8 characters, not bytes.</td>
</tr>

<tr>
<td valign="top" align="right">typeof(<i>X</i>)</td>
<td valign="top">Return the type of the expression <i>X</i>.  The only 
return values are "numeric" and "text".  SQLite's type handling is 
explained in <a href="datatypes.html">Datatypes in SQLite</a>.</td>
</tr>

<tr>
<td valign="top" align="right">upper(<i>X</i>)</td>
<td valign="top">Return a copy of input string <i>X</i> converted to all
upper-case letters.  The implementation of this function uses the C library
routine <b>toupper()</b> which means it may not work correctly on 
UTF-8 strings.</td>
</tr>
︙︙