[SQL] unnest in SELECT
I have a couple of questions regarding unnest. 1) If I issue a select statement "select unnest(vector1) as v from some_table", I cannot seem to use the column alias v in a WHERE or HAVING clause. I can use it in an ORDER BY or GROUP by clause. Is this the way it is supposed to work? 2) If I issue a select statement "select unnest(vector1) as v1, unnest(vector2) as v2 from some_table" and vector1 has a length of 3 and vector2 has a length of 4, the result set will have 12 rows with the data of vector1 repeating 4 times and vector2 repeating 3 times. Shouldn't the content of the shorter array(s) simply be return null in it's respective column and the result set be the size of the longest array? Thanks, Karl -- Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-sql
[SQL] unnest in SELECT
I have a couple of questions regarding unnest. 1) If I issue a select statement "select unnest(vector1) as v from some_table", I cannot seem to use the column alias v in a WHERE or HAVING clause. I can use it in an ORDER BY or GROUP by clause. Is this the way it is supposed to work? 2) If I issue a select statement "select unnest(vector1) as v1, unnest(vector2) as v2 from some_table" and vector1 has a length of 3 and vector2 has a length of 4, the result set will have 12 rows with the data of vector1 repeating 4 times and vector2 repeating 3 times. Shouldn't the content of the shorter array(s) simply be return null in it's respective column and the result set be the size of the longest array? Thanks, Karl -- Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-sql
