postgresql查询语句

//查询表名称
SELECT tablename FROM pg_tables
WHERE tablename NOT LIKE 'pg%'
AND tablename NOT LIKE 'sql_%'
ORDER BY tablename;

//查询数据库名称

SELECT datname FROM pg_database;

//给表列增加注释

comment on table user is 'Our session logs';

//postgresql查询注释信息

select description from pg_description

join pg_class on pg_description.objoid = pg_class.oid

where relname = 'user'