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Overview
| Comment: | Document the fact that SQLite allows NULL values in PRIMARY KEY columns and the fact that we might design to change this in the future. Ticket #518. (CVS 3373) |
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| Downloads: | Tarball | ZIP archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
b99d845ef4776595022c6fb855e582cf |
| User & Date: | drh 2006-08-29 13:08:38.000 |
Context
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2006-08-29
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| 18:46 | Bug fix: Get INSERT INTO ... SELECT working when the target is a virtual table. (CVS 3374) (check-in: 7912485705 user: drh tags: trunk) | |
| 13:08 | Document the fact that SQLite allows NULL values in PRIMARY KEY columns and the fact that we might design to change this in the future. Ticket #518. (CVS 3373) (check-in: b99d845ef4 user: drh tags: trunk) | |
| 12:04 | Improved built-in help in the command-line shell. Enable the fulltext search extension in the TCL interface. (CVS 3372) (check-in: 9763b4bfd5 user: drh tags: trunk) | |
Changes
Changes to www/lang.tcl.
1 2 3 | # # Run this Tcl script to generate the lang-*.html files. # | | | 1 2 3 4 5 6 7 8 9 10 11 |
#
# Run this Tcl script to generate the lang-*.html files.
#
set rcsid {$Id: lang.tcl,v 1.116 2006/08/29 13:08:38 drh Exp $}
source common.tcl
if {[llength $argv]>0} {
set outputdir [lindex $argv 0]
} else {
set outputdir ""
}
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559 560 561 562 563 564 565 566 567 568 569 570 571 572 | special names "<b>ROWID</b>", "<b>OID</b>", or "<b>_ROWID_</b>". This is true regardless of whether or not there is an INTEGER PRIMARY KEY. An INTEGER PRIMARY KEY column man also include the keyword AUTOINCREMENT. The AUTOINCREMENT keyword modified the way that B-Tree keys are automatically generated. Additional detail on automatic B-Tree key generation is available <a href="autoinc.html">separately</a>.</p> <p>If the "TEMP" or "TEMPORARY" keyword occurs in between "CREATE" and "TABLE" then the table that is created is only visible within that same database connection and is automatically deleted when the database connection is closed. Any indices created on a temporary table are also temporary. Temporary tables and indices are stored in a | > > > > > > > > > > > > | 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 | special names "<b>ROWID</b>", "<b>OID</b>", or "<b>_ROWID_</b>". This is true regardless of whether or not there is an INTEGER PRIMARY KEY. An INTEGER PRIMARY KEY column man also include the keyword AUTOINCREMENT. The AUTOINCREMENT keyword modified the way that B-Tree keys are automatically generated. Additional detail on automatic B-Tree key generation is available <a href="autoinc.html">separately</a>.</p> <p>According to the SQL standard, PRIMARY KEY should imply NOT NULL. Unfortunately, due to a long-standing coding oversight, this is not the case in SQLite. SQLite allows NULL values in a PRIMARY KEY column. We could change SQLite to conform to the standard (and we might do so in the future), but by the time the oversight was discovered, SQLite was in such wide use that we feared breaking legacy code if we fixed the problem. So for now we have chosen to contain allowing NULLs in PRIMARY KEY columns. Developers should be aware, however, that we may change SQLite to conform to the SQL standard in future and should design new programs accordingly.</p> <p>If the "TEMP" or "TEMPORARY" keyword occurs in between "CREATE" and "TABLE" then the table that is created is only visible within that same database connection and is automatically deleted when the database connection is closed. Any indices created on a temporary table are also temporary. Temporary tables and indices are stored in a |
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