comment ON TABLE TABLE_NAME IS 'comment';

comment ON COLUMN tableName.columnName IS '코멘트';

/* 테이블 주석 셀렉트 */
SELECT N.NSPNAME, C.RELNAME, OBJ_DESCRIPTION(C.OID) 
FROM PG_CATALOG.PG_CLASS C INNER JOIN PG_CATALOG.PG_NAMESPACE N ON C.RELNAMESPACE=N.OID 
WHERE C.RELKIND = 'r'
AND NSPNAME = '데이터베이스명'
AND RELNAME = '테이블명'

/* 컬럼 주석 셀렉트 */
SELECT
	PS.RELNAME AS TABLE_NAME,
	PA.ATTNAME AS COLUMN_NAME,
	PD.DESCRIPTION AS COLUMN_COMMENT
FROM PG_STAT_ALL_TABLES PS, PG_DESCRIPTION PD, PG_ATTRIBUTE PA
WHERE PD.OBJSUBID<>0
	AND PS.RELID=PD.OBJOID
	AND PD.OBJOID=PA.ATTRELID
	AND PD.OBJSUBID=PA.ATTNUM
	AND PS.SCHEMANAME='스키마'
	AND PS.RELNAME='테이블'
ORDER BY PS.RELNAME, PD.OBJSUBID