diff options
author | Bruce Momjian | 2009-09-17 21:13:01 +0000 |
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committer | Bruce Momjian | 2009-09-17 21:13:01 +0000 |
commit | c66244ad99c484da085cd23b24fab11a9567bc02 (patch) | |
tree | 91b4a4c24171011809dfd157f35092c4c9f30be1 | |
parent | 03c08256812b7e1f7ee6bee98eb38442e65d765c (diff) |
CVS NULL Documentation
Clearify documentation of CVS's output of NULL values, per suggestion
from Magnus.
Backpatch to 8.4.X.
-rw-r--r-- | doc/src/sgml/ref/copy.sgml | 11 |
1 files changed, 4 insertions, 7 deletions
diff --git a/doc/src/sgml/ref/copy.sgml b/doc/src/sgml/ref/copy.sgml index 0821818310..a89f33eb5a 100644 --- a/doc/src/sgml/ref/copy.sgml +++ b/doc/src/sgml/ref/copy.sgml @@ -550,13 +550,10 @@ COPY <replaceable class="parameter">count</replaceable> <para> The <literal>CSV</> format has no standard way to distinguish a <literal>NULL</> value from an empty string. - <productname>PostgreSQL</>'s <command>COPY</> handles this by - quoting. A <literal>NULL</> is output as the <literal>NULL</> - string and is not quoted, while a data value matching the - <literal>NULL</> string is quoted. Therefore, using the default - settings, a <literal>NULL</> is written as an unquoted empty - string, while an empty string is written with double quotes - (<literal>""</>). Reading values follows similar rules. You can + <productname>PostgreSQL</>'s <command>COPY</> handles this using + quoting. A <literal>NULL</> is output as an empty string without + quotes, while an empty string data value is double-quoted + (<literal>""</>). Reading values follows similar rules. You can use <literal>FORCE NOT NULL</> to prevent <literal>NULL</> input comparisons for specific columns. </para> |