--------------------------------------------------------------------------- -- -- 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;
数据库技术:postgresql 11.1 源码 /src/tutorial/syscat.source地址:https://blog.csdn.net/ctypyb2002/article/details/108993665
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