postgresql 11.1 源码 /src/tutorial/syscat.source

朱雀 2022-12-13 04:37 74阅读 0赞

---------------------------------------------------------------------------
    --
    -- syscat.sql-
    --    sample queries to the system catalogs
    --
    --
    -- Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
    -- Portions Copyright (c) 1994, Regents of the University of California
    --
    -- src/tutorial/syscat.source
    --
    ---------------------------------------------------------------------------
    
    --
    -- Sets the schema search path to pg_catalog first, so that we do not
    -- need to qualify every system object
    --
    SET search_path TO pg_catalog;
    
    -- The LIKE pattern language requires underscores to be escaped, so make
    -- sure the backslashes are not misinterpreted.
    SET standard_conforming_strings TO on;
    
    --
    -- lists the names of all database owners and the name of their database(s)
    --
    SELECT rolname, datname
      FROM pg_roles, pg_database
      WHERE pg_roles.oid = datdba
      ORDER BY rolname, datname;
    
    --
    -- lists all user-defined classes
    --
    SELECT n.nspname, c.relname
      FROM pg_class c, pg_namespace n
      WHERE c.relnamespace=n.oid
        and c.relkind = 'r'                   -- not indices, views, etc
        and n.nspname not like 'pg\_%'       -- not catalogs
        and n.nspname != 'information_schema' -- not information_schema
      ORDER BY nspname, relname;
    
    
    --
    -- lists all simple indices (ie. those that are defined over one simple
    -- column reference)
    --
    SELECT n.nspname AS schema_name,
           bc.relname AS class_name,
           ic.relname AS index_name,
           a.attname
      FROM pg_namespace n,
           pg_class bc,             -- base class
           pg_class ic,             -- index class
           pg_index i,
           pg_attribute a           -- att in base
      WHERE bc.relnamespace = n.oid
         and i.indrelid = bc.oid
         and i.indexrelid = ic.oid
         and i.indkey[0] = a.attnum
         and i.indnatts = 1
         and a.attrelid = bc.oid
      ORDER BY schema_name, class_name, index_name, attname;
    
    
    --
    -- lists the user-defined attributes and their types for all user-defined
    -- classes
    --
    SELECT n.nspname, c.relname, a.attname, format_type(t.oid, null) as typname
      FROM pg_namespace n, pg_class c,
           pg_attribute a, pg_type t
      WHERE n.oid = c.relnamespace
        and c.relkind = 'r'     -- no indices
        and n.nspname not like 'pg\_%' -- no catalogs
        and n.nspname != 'information_schema' -- no information_schema
        and a.attnum > 0        -- no system att's
        and not a.attisdropped   -- no dropped columns
        and a.attrelid = c.oid
        and a.atttypid = t.oid
      ORDER BY nspname, relname, attname;
    
    
    --
    -- lists all user-defined base types (not including array types)
    --
    SELECT n.nspname, r.rolname, format_type(t.oid, null) as typname
      FROM pg_type t, pg_roles r, pg_namespace n
      WHERE r.oid = t.typowner
        and t.typnamespace = n.oid
        and t.typrelid = 0   -- no complex types
        and t.typelem = 0    -- no arrays
        and n.nspname not like 'pg\_%' -- no built-in types
        and n.nspname != 'information_schema' -- no information_schema
      ORDER BY nspname, rolname, typname;
    
    
    --
    -- lists all left unary operators
    --
    SELECT n.nspname, o.oprname AS left_unary,
           format_type(right_type.oid, null) AS operand,
           format_type(result.oid, null) AS return_type
      FROM pg_namespace n, pg_operator o,
           pg_type right_type, pg_type result
      WHERE o.oprnamespace = n.oid
        and o.oprkind = 'l'           -- left unary
        and o.oprright = right_type.oid
        and o.oprresult = result.oid
      ORDER BY nspname, operand;
    
    
    --
    -- lists all right unary operators
    --
    SELECT n.nspname, o.oprname AS right_unary,
           format_type(left_type.oid, null) AS operand,
           format_type(result.oid, null) AS return_type
      FROM pg_namespace n, pg_operator o,
           pg_type left_type, pg_type result
      WHERE o.oprnamespace = n.oid
        and o.oprkind = 'r'          -- right unary
        and o.oprleft = left_type.oid
        and o.oprresult = result.oid
      ORDER BY nspname, operand;
    
    --
    -- lists all binary operators
    --
    SELECT n.nspname, o.oprname AS binary_op,
           format_type(left_type.oid, null) AS left_opr,
           format_type(right_type.oid, null) AS right_opr,
           format_type(result.oid, null) AS return_type
      FROM pg_namespace n, pg_operator o, pg_type left_type,
           pg_type right_type, pg_type result
      WHERE o.oprnamespace = n.oid
        and o.oprkind = 'b'         -- binary
        and o.oprleft = left_type.oid
        and o.oprright = right_type.oid
        and o.oprresult = result.oid
      ORDER BY nspname, left_opr, right_opr;
    
    
    --
    -- lists the name, number of arguments and the return type of all user-defined
    -- C functions
    --
    SELECT n.nspname, p.proname, p.pronargs, format_type(t.oid, null) as return_type
      FROM pg_namespace n, pg_proc p,
           pg_language l, pg_type t
      WHERE p.pronamespace = n.oid
        and n.nspname not like 'pg\_%' -- no catalogs
        and n.nspname != 'information_schema' -- no information_schema
        and p.prolang = l.oid
        and p.prorettype = t.oid
        and l.lanname = 'c'
      ORDER BY nspname, proname, pronargs, return_type;
    
    --
    -- lists all aggregate functions and the types to which they can be applied
    --
    SELECT n.nspname, p.proname, format_type(t.oid, null) as typname
      FROM pg_namespace n, pg_aggregate a,
           pg_proc p, pg_type t
      WHERE p.pronamespace = n.oid
        and a.aggfnoid = p.oid
        and p.proargtypes[0] = t.oid
      ORDER BY nspname, proname, typname;
    
    
    --
    -- lists all the operator families that can be used with each access method
    -- as well as the operators that can be used with the respective operator
    -- families
    --
    SELECT am.amname, n.nspname, opf.opfname, opr.oprname
      FROM pg_namespace n, pg_am am, pg_opfamily opf,
           pg_amop amop, pg_operator opr
      WHERE opf.opfnamespace = n.oid
        and opf.opfmethod = am.oid
        and amop.amopfamily = opf.oid
        and amop.amopopr = opr.oid
      ORDER BY nspname, amname, opfname, oprname;
    
    --
    -- Reset the search path and standard_conforming_strings to their defaults
    --
    RESET search_path;
    RESET standard_conforming_strings;