Egor Spivac: How to get some information about PostgreSQL structure (Part 2)

Schemas

SELECT 
CASE 
    WHEN nspname LIKE E'pg\_temp\_%' THEN 1 
    WHEN (nspname LIKE E'pg\_%') THEN 0  
    ELSE 3 
END AS nsptyp, nsp.nspname, nsp.oid, pg_get_userbyid(nspowner) 
    AS namespaceowner, 
    nspacl, description,  
    has_schema_privilege(nsp.oid, 'CREATE') as cancreate 
FROM pg_namespace nsp 
LEFT OUTER JOIN pg_description des ON des.objoid=nsp.oid  
WHERE NOT ((nspname = 'pg_catalog' AND EXISTS 
(SELECT 1 FROM pg_class 
    WHERE relname = 'pg_class' 
    AND relnamespace = nsp.oid LIMIT 1)) OR  
(nspname = 'information_schema' AND 
    EXISTS (SELECT 1 FROM pg_class 
            WHERE relname = 'tables' 
            AND relnamespace = nsp.oid LIMIT 1)) OR  
(nspname LIKE '_%' AND 
    EXISTS (SELECT 1 FROM pg_proc 
            WHERE proname='slonyversion' 
            AND pronamespace = nsp.oid LIMIT 1)) OR  
(nspname = 'dbo' AND 
    EXISTS (SELECT 1 FROM pg_class 
            WHERE relname = 'systables' 
            AND relnamespace = nsp.oid LIMIT 1)) OR  
(nspname = 'sys' AND 
    EXISTS (SELECT 1 FROM pg_class 
            WHERE relname = 'all_tables' 
            AND relnamespace = nsp.oid LIMIT 1))
) 
AND nspname NOT LIKE E'pg\_temp\_%'
AND nspname NOT LIKE E'pg\_toast_temp\_%' 
ORDER BY 1, nspname

Tables

SELECT n.nspname as "Schema",  c.relname AS datname,  
CASE c.relkind 
    WHEN 'r' THEN 'table' 
    WHEN 'v' THEN 'view' 
    WHEN 'i' THEN 'index' 
    WHEN 'S' THEN 'sequence' 
    WHEN 's' THEN 'special' 
END as "Type",  u.usename as "Owner", 
(SELECT obj_description(c.oid, 'pg_class')) AS comment  
FROM pg_catalog.pg_class c 
LEFT JOIN pg_catalog.pg_user u ON u.usesysid = c.relowner 
LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace 
WHERE n.nspname='public' AND c.relkind IN ('r','') 
AND n.nspname NOT IN ('pg_catalog', 'pg_toast', 'information_schema')
ORDER BY datname ASC 

Fields

SELECT pg_tables.tablename, pg_attribute.attname AS field, 
    format_type(pg_attribute.atttypid, -1) AS "type", 
    pg_attribute.atttypmod AS len,
    (SELECT col_description(pg_attribute.attrelid, 
            pg_attribute.attnum)) AS comment, 
    CASE pg_attribute.attnotnull 
        WHEN false THEN 1  ELSE 0  
    END AS "notnull", 
    pg_constraint.conname AS "key", pc2.conname AS ckey, 
    (SELECT pg_attrdef.adsrc FROM pg_attrdef 
        WHERE pg_attrdef.adrelid = pg_class.oid 
        AND pg_attrdef.adnum = pg_attribute.attnum) AS def 
FROM pg_tables, pg_class 
JOIN pg_attribute ON pg_class.oid = pg_attribute.attrelid 
    AND pg_attribute.attnum > 0 
LEFT JOIN pg_constraint ON pg_constraint.contype = 'p'::"char" 
    AND pg_constraint.conrelid = pg_class.oid AND
    (pg_attribute.attnum = ANY (pg_constraint.conkey)) 
LEFT JOIN pg_constraint AS pc2 ON pc2.contype = 'f'::"char" 
    AND pc2.conrelid = pg_class.oid 
    AND (pg_attribute.attnum = ANY (pc2.conkey)) 
WHERE pg_class.relname = pg_tables.tablename  
    AND pg_tables.tableowner = "current_user"() 
    AND pg_attribute.atttypid <> 0::oid  
    AND tablename='table1' 
ORDER BY field ASC 

See First part