Firebird Documentation Index → Firebird Null Guide → Document history |
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The exact file history is recorded in the manual
module in our CVS tree; see http://sourceforge.net/cvs/?group_id=9028
Revision History | |||
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0.1 | 8 Apr 2005 | PV |
First edition. |
0.2 | 15 Apr 2005 | PV |
Mentioned that Fb 2.0 legalises “A = NULL”
comparisons. Changed text in “Testing if something is NULL ”.Slightly altered “Dealing with NULL s”
section. |
1.0 | 24 Jan 2007 | PV |
This is a major update, with so much new material added that the document has
grown to around 4 times its former size. In addition, much of the existing text has been
reorganised and thoroughly reworked. It's not feasible to give a summary of all the
changes here. Consider this a new guide with 15–25% old material. The most important
additions are:
|
1.0.1 | 26 Jan 2007 | PV |
Making non-nullable columns nullable again: Provisory fix
of error regarding removal of NOT NULL constraints. |
1.1 | .. Xxx 201x | PV |
What is NULL ?: Added subsection
NULL as a default state.NULL support in Firebird SQL :: Assigning
NULL : Added 4th example.Predicates :: EXISTS and SINGULAR: “evolves” -> “evaluates” (2x) in Note. Altering populated tables :: Adding a non-nullable field to a populated table :: Adding a NOT NULL field: Added para + additional programlisting after first programlisting. Altering populated tables :: Adding a non-nullable field to a populated table :: Adding a CHECKed column: Added second Note. Altering populated tables :: Adding a non-nullable field to a populated table :: Adding a non-nullable field using domains: Renamed section to Using domains to add a non-nullable field. Altering populated tables :: Adding a non-nullable field to a populated table :: Using domains to add a non-nullable field: Two programlistings instead of one. Text heavily edited and extended. Altering populated tables :: Making existing columns non-nullable :: Making an existing column NOT NULL: Added Warning. Altering populated tables :: Making non-nullable columns nullable again: Largely rewritten, greatly extended and divided into subsections. Changing the nullability of a domain :: New top-level section. For free! Summary: Added “Every field or variable that has been created but not initialised is in a NULL state” as second
listitem. |
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Firebird Documentation Index → Firebird Null Guide → Document history |