diff --git a/doc/src/sgml/ref/copy.sgml b/doc/src/sgml/ref/copy.sgml index e7f76d3e58..238397828f 100644 --- a/doc/src/sgml/ref/copy.sgml +++ b/doc/src/sgml/ref/copy.sgml @@ -1,5 +1,5 @@ @@ -541,16 +541,13 @@ COPY count non-NULL values in specific columns. - + The CSV format has no standard way to distinguish a NULL value from an empty string. - PostgreSQL's COPY handles this by - quoting. A NULL is output as the NULL - string and is not quoted, while a data value matching the - NULL string is quoted. Therefore, using the default - settings, a NULL is written as an unquoted empty - string, while an empty string is written with double quotes - (""). Reading values follows similar rules. You can + PostgreSQL's COPY handles this using + quoting. A NULL is output as an empty string without + quotes, while an empty string data value is double-quoted + (""). Reading values follows similar rules. You can use FORCE NOT NULL to prevent NULL input comparisons for specific columns.