Dear all, after reading about the pg_* system tables, I made up a view to see the all user columns, their type, default value, indices etc. at once (see example below). Now my first question is:
- Is it possible to get the same result with a simpler / shorter SQL query than shown below (I'm not so familiar with SQL yet, hopefully that query is correct in the first place...)? I was also trying to get the RI-Constraints out of the pg_* tables. I found the two tables involved in a RI-Constraint in pg_trigger (tgrelid, tgconstrrelid), but the affected columns are only(?) in the tgargs. To get them out of tgargs, I need some (easy) string processing. My second question is: - Is it possible to get not only the two tables, but also their corresponding two columns involved in a RI-Constraint out of the pg_* tables just with a SQL query? Thanks for any comments! Tilo Example and view definition for question one: Example: testobj=> select * from columns; table | column | type | len | notnull | dims | default_value | index | primary | unique -------------+----------+------+-----+---------+------+---------------------------------+----------------------+---------+-------- bbox | box | box | 32 | f | 0 | | bbox_area | f | f bbox | box | box | 32 | f | 0 | | bbox_box | f | f bbox | box | box | 32 | f | 0 | | bbox_height | f | f bbox | box | box | 32 | f | 0 | | bbox_width | f | f bbox | id | int4 | 4 | t | 0 | nextval('"bbox_id_seq"'::text) | bbox_pkey | t | t bbox | obj_id | int4 | 4 | f | 0 | | bbox_obj_id | f | f label | descr | text | -1 | f | 0 | | | | label | id | int4 | 4 | t | 0 | nextval('"label_id_seq"'::text) | label_pkey | t | t obj | id | int4 | 4 | t | 0 | nextval('"obj_id_seq"'::text) | obj_pkey | t | t obj_label_r | label_id | int4 | 4 | f | 0 | | obj_label_r_label_id | f | f obj_label_r | obj_id | int4 | 4 | f | 0 | | obj_label_r_obj_id | f | f test2 | a | int4 | 4 | f | 0 | | test2id | f | f test2 | b | int4 | 4 | f | 0 | | | | test2 | c | int4 | 4 | f | 0 | | test2id | f | f test2 | d | int4 | 4 | f | 0 | | | | test2 | e | int4 | 4 | f | 0 | | test2id | f | f (16 rows) View definition: CREATE VIEW columns as select defj.relname as table, defj.attname as column, defj.typname as type, defj.attlen as len, defj.attnotnull as notnull, defj.attndims as dims, defj.adsrc as default_value, indj.relname as index, indj.indisprimary as primary, indj.indisunique as unique from -- first get all user columns for all user tables ((select * from pg_class, pg_attribute, pg_type where pg_class.oid = attrelid and pg_type.oid = atttypid and relname !~ 'pg_' and relname !~ 'pga_' and pg_class.relkind = 'r' and pg_attribute.attnum > 0) as colj -- then get possible default values left outer join pg_attrdef on attrelid = adrelid and attnum = adnum) as defj -- then get possible indices left outer join (select * from pg_class, pg_index, pg_attribute where pg_class.oid = indexrelid and pg_class.oid = attrelid) as indj on (defj.attrelid = indj.indrelid and defj.attnum = indj.indkey[indj.attnum-1]) order by 1, 2, index; ---------------------------(end of broadcast)--------------------------- TIP 6: Have you searched our list archives? http://archives.postgresql.org