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Is there a way with PostgreSQL to sort rows with NULL values in fields to the end of the selected table?
Like:
SELECT * FROM table ORDER BY somevalue, PUT_NULL_TO_END 
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If you sort a column with NULL values in ascending order, the NULLs will come first. Alternatively, if you add a DESC keyword to get a descending order, NULLs will appear last.
If you specify the ORDER BY clause, NULL values by default are ordered as less than values that are not NULL. Using the ASC order, a NULL value comes before any non-NULL value; using DESC order, the NULL comes last.
If the null ordering is not specified then the handling of the null values is: - NULLS LAST if the sort is ASC - NULLS FIRST if the sort is DESC - If neither ascending nor descending order is specified, and the null ordering is also not specified, then both defaults are used and thus the order will be ascending with ...
1 Answer. The correct answer is, option (a): Null values are displayed last in the ascending sequences.
NULL values are sorted last in default ascending order. You don't have to do anything extra.
The issue applies to descending order, which is the perfect inverse and thus sorts NULL values on top.
PostgreSQL 8.3 introduced NULLS LAST:
ORDER BY somevalue DESC NULLS LAST For PostgreSQL 8.2 and older or other RDBMS without this standard SQL feature:
ORDER BY (somevalue IS NULL), somevalue DESC FALSE sorts before TRUE, so NULL values come last, just like in the example above.
See:
SELECT
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Does this make the trick?
ORDER BY somevalue DESC NULLS LAST Taken from: http://www.postgresql.org/docs/9.0/static/sql-select.html
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