mirror of https://github.com/sqlite/sqlite
Update the NULL-handling document to show current behavior of OCELOT. (CVS 1046)
FossilOrigin-Name: 1d4c92c7325f69ee84b901a2de74a306ace134b6
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drh
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C Correctly\shandle\scomparing\san\sINTEGER\sPRIMARY\sKEY\sagainst\sa\sfloating\spoint\nnumber.\s\sTicket\s#377.\s(CVS\s1045)
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D 2003-07-06T17:22:25
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C Update\sthe\sNULL-handling\sdocument\sto\sshow\scurrent\sbehavior\sof\sOCELOT.\s(CVS\s1046)
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D 2003-07-07T00:10:40
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F Makefile.in 9ad23ed4ca97f9670c4496432e3fbd4b3760ebde
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F Makefile.linux-gcc b86a99c493a5bfb402d1d9178dcdc4bd4b32f906
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F README f1de682fbbd94899d50aca13d387d1b3fd3be2dd
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@ -160,7 +160,7 @@ F www/formatchng.tcl ca6cc1cb1bef9bc36f0619049d3c95e749bc6983
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F www/index.tcl a34315cada875af0b098b4c45981da8ab33fe7b6
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F www/lang.tcl 2890eb85809c8fca20c1d81fa30fbdbceecc2a43
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F www/mingw.tcl d96b451568c5d28545fefe0c80bee3431c73f69c
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F www/nulls.tcl f0304bc4dbe344f4738e52ad45906c5ffd289fbb
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F www/nulls.tcl 4ac1c9bbb8a20a76500d18d63b383f51bb7d8be7
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F www/omitted.tcl fe59eaa9c1459cbf08fa7daa83421bfc814331bb
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F www/opcode.tcl b8d561f33597c62955796b797646f00144d97332
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F www/quickstart.tcl 4e97bef825e6a4153c43afb9f97235fc4da278ab
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@ -168,7 +168,7 @@ F www/speed.tcl 2f6b1155b99d39adb185f900456d1d592c4832b3
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F www/sqlite.tcl 3c83b08cf9f18aa2d69453ff441a36c40e431604
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F www/tclsqlite.tcl 1db15abeb446aad0caf0b95b8b9579720e4ea331
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F www/vdbe.tcl 9b9095d4495f37697fd1935d10e14c6015e80aa1
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P eb4582831d536cd26a1738f9ad197e40486d0958
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R 43de0a05995ade2e959437ae132085ed
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P 982aa3356bcc217003cd9e6a829619219c334797
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R 5b70a86c3000b6c8ddc166ce19c2041e
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U drh
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Z 1a72f69ccd161f8e14773ca5f56644c7
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Z 72ccf7d5146876d033c3e7ec8d5fed3c
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@ -1 +1 @@
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982aa3356bcc217003cd9e6a829619219c334797
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1d4c92c7325f69ee84b901a2de74a306ace134b6
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@ -1,7 +1,7 @@
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#
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# Run this script to generated a nulls.html output file
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#
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set rcsid {$Id: nulls.tcl,v 1.2 2003/07/01 01:16:30 drh Exp $}
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set rcsid {$Id: nulls.tcl,v 1.3 2003/07/07 00:10:40 drh Exp $}
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puts {<html>
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<head>
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@ -44,7 +44,7 @@ worked this way. So SQLite was modified to work the same as
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Oracle, PostgreSQL, and DB2. This involved making NULLs
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indistinct for the purposes of the SELECT DISTINCT statement and
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for the UNION operator in a SELECT. NULLs are still distinct
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in a UNIQUE index. This seems somewhat arbitrary, but the desire
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in a UNIQUE column. This seems somewhat arbitrary, but the desire
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to be compatible with other engines outweighted that objection.
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</p>
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@ -59,7 +59,7 @@ change the value of the NULL_ALWAYS_DISTINCT #define in the
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The following table shows the results of the NULL handling experiments.
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</p>
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<table border=1 cellpadding=5 width="100%">
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<table border=1 cellpadding=3 width="100%">
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<tr><th>  </th>
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<th>SQLite</th>
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<th>PostgreSQL</th>
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@ -67,6 +67,7 @@ The following table shows the results of the NULL handling experiments.
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<th>Informix</th>
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<th>DB2</th>
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<th>MS-SQL</th>
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<th>OCELOT</th>
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</tr>
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<tr><td>Adding anything to null gives null</td>
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@ -76,6 +77,7 @@ The following table shows the results of the NULL handling experiments.
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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</tr>
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<tr><td>Multiplying null by zero gives null</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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@ -84,14 +86,16 @@ The following table shows the results of the NULL handling experiments.
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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</tr>
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<tr><td>nulls are distinct in a UNIQUE index</td>
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<tr><td>nulls are distinct in a UNIQUE column</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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</tr>
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<tr><td>nulls are distinct in SELECT DISTINCT</td>
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<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
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@ -100,6 +104,7 @@ The following table shows the results of the NULL handling experiments.
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<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
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<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
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<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
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<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
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</tr>
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<tr><td>nulls are distinct in a UNION</td>
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<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
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@ -108,6 +113,7 @@ The following table shows the results of the NULL handling experiments.
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<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
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<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
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<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
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<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
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</tr>
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<tr><td>"CASE WHEN null THEN 1 ELSE 0 END" is 0?</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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@ -116,6 +122,7 @@ The following table shows the results of the NULL handling experiments.
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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</tr>
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<tr><td>"null OR true" is true</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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@ -124,6 +131,7 @@ The following table shows the results of the NULL handling experiments.
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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</tr>
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<tr><td>"not (null AND false)" is true</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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@ -132,13 +140,13 @@ The following table shows the results of the NULL handling experiments.
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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</tr>
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</table>
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<table border=1 cellpadding=5 width="100%">
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<table border=1 cellpadding=3 width="100%">
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<tr><th>  </th>
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<th>MySQL</th>
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<th>OCELOT</th>
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<th>Firebird</th>
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<th>SQL Anywhere</th>
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<th>Borland Interbase</th>
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@ -149,17 +157,14 @@ The following table shows the results of the NULL handling experiments.
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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</tr>
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<tr><td>Multiplying null by zero gives null</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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</tr>
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<tr><td>nulls are distinct in a UNIQUE index</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<tr><td>nulls are distinct in a UNIQUE column</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#aaaad2">(Note 4)</td>
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@ -167,35 +172,30 @@ The following table shows the results of the NULL handling experiments.
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</tr>
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<tr><td>nulls are distinct in SELECT DISTINCT</td>
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<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#aaaad2">(Note 1)</td>
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<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
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<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
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</tr>
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<tr><td>nulls are distinct in a UNION</td>
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<td valign="center" align="center" bgcolor="#aaaad2">(Note 3)</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#aaaad2">(Note 1)</td>
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<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
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<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
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</tr>
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<tr><td>"CASE WHEN null THEN 1 ELSE 0 END" is 0?</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#aaaad2">(Note 2)</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#aaaad2">(Note 5)</td>
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</tr>
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<tr><td>"null OR true" is true</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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</tr>
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<tr><td>"not (null AND false)" is true</td>
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<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
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<td valign="center" align="center" bgcolor="#c7a9a9">No</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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<td valign="center" align="center" bgcolor="#a9c7a9">Yes</td>
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