Hi, I have three tables, two of which are missing a column:
CREATE TABLE table1 (t1 TEXT); CREATE TABLE table2 (t2 TEXT); CREATE TABLE table3 (t3 TEXT, i3 INTEGER); I am trying to create a view over these tables that defaults values for non-existant columns to NULL. CREATE VIEW view1 (i, t) AS SELECT t1, NULL FROM table1 UNION ALL SELECT t2, NULL FROM table2 UNION ALL SELECT t3, i3 FROM table3 ; This fails with ERROR: UNION types 'text' and 'integer' not matched suggesting that NULL+NULL produces TEXT as type of the second column in the union. The plain select (without CREATE VIEW) fails in the same way. It works for two tables (NULL+INTEGER = INTEGER): CREATE VIEW view2 (i, t) AS SELECT t1, NULL FROM table1 UNION ALL SELECT t3, i3 FROM table3 ; and of course with explicit casts CREATE VIEW view3 (i, t) AS SELECT t1, NULL::integer FROM table1 UNION ALL SELECT t2, NULL::integer FROM table2 UNION ALL SELECT t3, i3 FROM table3 ; Best wishes, Mike PS: This is version() 'PostgreSQL 7.3.1 on i686-pc-linux-gnu, compiled by GCC 2.95.4'. -- Life is like a fire. DI Michael Wildpaner Flames which the passer-by forgets. Ph.D. Student Ashes which the wind scatters. A man lived. -- Omar Khayyam ---------------------------(end of broadcast)--------------------------- TIP 3: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly