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Update the null-handling document to show how SQL Anywhere and Borland

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Interbase deal with NULLs. (CVS 1043)

FossilOrigin-Name: 9a87f2f326d7fc8bb9f832d0e3fd31141e14e08f
This commit is contained in:
drh 2003-07-01 01:16:30 +00:00
parent ef2d1b100c
commit c5aceb33cb
3 changed files with 84 additions and 35 deletions
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12
manifest
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@ -1,5 +1,5 @@
C Documentation\schange:\srefer\susers\sto\sthe\swiki\sfor\sadditional\sunsupported\nfeatures\srather\sthan\shave\sthem\ssend\sme\se-mail.\s(CVS\s1042)
D 2003-06-30T10:36:23
C Update\sthe\snull-handling\sdocument\sto\sshow\show\sSQL\sAnywhere\sand\sBorland\nInterbase\sdeal\swith\sNULLs.\s(CVS\s1043)
D 2003-07-01T01:16:30
F Makefile.in 9ad23ed4ca97f9670c4496432e3fbd4b3760ebde
F Makefile.linux-gcc b86a99c493a5bfb402d1d9178dcdc4bd4b32f906
F README f1de682fbbd94899d50aca13d387d1b3fd3be2dd
@ -159,7 +159,7 @@ F www/formatchng.tcl ca6cc1cb1bef9bc36f0619049d3c95e749bc6983
F www/index.tcl a34315cada875af0b098b4c45981da8ab33fe7b6
F www/lang.tcl 2890eb85809c8fca20c1d81fa30fbdbceecc2a43
F www/mingw.tcl d96b451568c5d28545fefe0c80bee3431c73f69c
F www/nulls.tcl 29497dac2bc5b437aa7e2e94577dad4d8933ed26
F www/nulls.tcl f0304bc4dbe344f4738e52ad45906c5ffd289fbb
F www/omitted.tcl fe59eaa9c1459cbf08fa7daa83421bfc814331bb
F www/opcode.tcl b8d561f33597c62955796b797646f00144d97332
F www/quickstart.tcl 4e97bef825e6a4153c43afb9f97235fc4da278ab
@ -167,7 +167,7 @@ F www/speed.tcl 2f6b1155b99d39adb185f900456d1d592c4832b3
F www/sqlite.tcl 3c83b08cf9f18aa2d69453ff441a36c40e431604
F www/tclsqlite.tcl 1db15abeb446aad0caf0b95b8b9579720e4ea331
F www/vdbe.tcl 9b9095d4495f37697fd1935d10e14c6015e80aa1
P 7f5e8894ae37761d1015c426b5d383d3deef3e25
R a6cc3a4266f28cd733e63c9a8d83c011
P a3920b0804e9993bb21e6c46c612e72bd03178a2
R a8b083bb866a87dcf70f77ed1fb561d9
U drh
Z eacae768ac4a586e6c3db54c44a1bdf7
Z 3174cbe95c851c7270578015eafa897d

2
manifest.uuid
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a3920b0804e9993bb21e6c46c612e72bd03178a2
9a87f2f326d7fc8bb9f832d0e3fd31141e14e08f

105
www/nulls.tcl
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@ -1,7 +1,7 @@
#
# Run this script to generated a nulls.html output file
#
set rcsid {$Id: nulls.tcl,v 1.1 2002/09/02 14:11:04 drh Exp $}
set rcsid {$Id: nulls.tcl,v 1.2 2003/07/01 01:16:30 drh Exp $}
puts {<html>
<head>
@ -67,9 +67,6 @@ The following table shows the results of the NULL handling experiments.
<th>Informix</th>
<th>DB2</th>
<th>MS-SQL</th>
<th>MySQL</th>
<th>OCELOT</th>
<th>Firebird</th>
</tr>
<tr><td>Adding anything to null gives null</td>
@ -79,9 +76,6 @@ The following table shows the results of the NULL handling experiments.
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
</tr>
<tr><td>Multiplying null by zero gives null</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
@ -90,9 +84,6 @@ The following table shows the results of the NULL handling experiments.
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
</tr>
<tr><td>nulls are distinct in a UNIQUE index</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
@ -101,9 +92,6 @@ The following table shows the results of the NULL handling experiments.
<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
</tr>
<tr><td>nulls are distinct in SELECT DISTINCT</td>
<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
@ -112,9 +100,6 @@ The following table shows the results of the NULL handling experiments.
<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#aaaad2">(Note 1)</td>
</tr>
<tr><td>nulls are distinct in a UNION</td>
<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
@ -123,9 +108,6 @@ The following table shows the results of the NULL handling experiments.
<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
<td valign="center" align="center" bgcolor="#aaaad2">(Note 3)</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#aaaad2">(Note 1)</td>
</tr>
<tr><td>"CASE WHEN null THEN 1 ELSE 0 END" is 0?</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
@ -134,9 +116,6 @@ The following table shows the results of the NULL handling experiments.
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#aaaad2">(Note 2)</td>
</tr>
<tr><td>"null OR true" is true</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
@ -145,9 +124,6 @@ The following table shows the results of the NULL handling experiments.
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
</tr>
<tr><td>"not (null AND false)" is true</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
@ -156,22 +132,95 @@ The following table shows the results of the NULL handling experiments.
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
</tr>
</table>
<table border=1 cellpadding=5 width="100%">
<tr><th>&nbsp&nbsp;</th>
<th>MySQL</th>
<th>OCELOT</th>
<th>Firebird</th>
<th>SQL Anywhere</th>
<th>Borland Interbase</th>
</tr>
<tr><td>Adding anything to null gives null</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
</tr>
<tr><td>Multiplying null by zero gives null</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
</tr>
<tr><td>nulls are distinct in a UNIQUE index</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#aaaad2">(Note 4)</td>
<td valign="center" align="center" bgcolor="#aaaad2">(Note 4)</td>
</tr>
<tr><td>nulls are distinct in SELECT DISTINCT</td>
<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#aaaad2">(Note 1)</td>
<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
</tr>
<tr><td>nulls are distinct in a UNION</td>
<td valign="center" align="center" bgcolor="#aaaad2">(Note 3)</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#aaaad2">(Note 1)</td>
<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
</tr>
<tr><td>"CASE WHEN null THEN 1 ELSE 0 END" is 0?</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#aaaad2">(Note 2)</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#aaaad2">(Note 5)</td>
</tr>
<tr><td>"null OR true" is true</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
</tr>
<tr><td>"not (null AND false)" is true</td>
<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
</tr>
</table>
<table border=0 align="right" cellpadding=0 cellspacing=0>
<tr>
<td valign="top" rowspan=3>Notes:&nbsp;&nbsp;</td>
<td valign="top" rowspan=5>Notes:&nbsp;&nbsp;</td>
<td>1.&nbsp;</td>
<td>Firebird omits all NULLs from SELECT DISTINCT and from UNION.</td>
</tr>
<tr><td>2.&nbsp;</td>
<td>Test data unavailable.</td></tr>
<td>Test data unavailable.</td>
</tr>
<tr><td>3.&nbsp;</td>
<td>The version of MySQL tested (3.23.41) does not support UNION.</td></tr>
<td>The version of MySQL tested (3.23.41) does not support UNION.</td>
</tr>
<tr><td>4.&nbsp;</td>
<td>SQL Anywhere and Borland Interbase
do not allow NULLs in a UNIQUE column.</td>
</tr>
<tr><td>5.&nbsp;</td>
<td>Borland Interbase does not support CASE expressions.</td>
</tr>
</table>
<br clear="both">