diff options
| author | Bruce Momjian <bruce@momjian.us> | 2010-04-06 02:18:04 +0000 |
|---|---|---|
| committer | Bruce Momjian <bruce@momjian.us> | 2010-04-06 02:18:04 +0000 |
| commit | 08c1d4e56050f59a326c78eca4c26aaeed0d86d4 (patch) | |
| tree | 817cd5becd6cb716babdd877c56c4dc9b37caa99 /doc/src | |
| parent | f1926c93c860f1ae37cf8c0c5d738bc6e448cb00 (diff) | |
| download | postgresql-08c1d4e56050f59a326c78eca4c26aaeed0d86d4.tar.gz postgresql-08c1d4e56050f59a326c78eca4c26aaeed0d86d4.zip | |
Reword exclusion constriants to mention that the operator can return
false or null, per Tom.
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/ddl.sgml | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/doc/src/sgml/ddl.sgml b/doc/src/sgml/ddl.sgml index c1dc645cc8f..ab4021ad3c1 100644 --- a/doc/src/sgml/ddl.sgml +++ b/doc/src/sgml/ddl.sgml @@ -1,4 +1,4 @@ -<!-- $PostgreSQL: pgsql/doc/src/sgml/ddl.sgml,v 1.92 2010/04/03 07:22:53 petere Exp $ --> +<!-- $PostgreSQL: pgsql/doc/src/sgml/ddl.sgml,v 1.93 2010/04/06 02:18:04 momjian Exp $ --> <chapter id="ddl"> <title>Data Definition</title> @@ -861,7 +861,8 @@ CREATE TABLE order_items ( <para> Exclusion constraints ensure that if any two rows are compared on the specified columns or expressions using the specified operators, - at least one of these operator comparisons will be false. The syntax is: + at least one of these operator comparisons will return false or null. + The syntax is: <programlisting> CREATE TABLE circles ( c circle, |