PostgreSQL实用查询SQL(二)
：relpages*8 是实际所占磁盘大小
--查看表空间大小
select pg_tablespace_size('pg_default');
--查看序列与表的对应关系
WITH fq_objects AS (SELECT c.oid,c.relname AS fqname ,
c.relkind, c.relname AS relation
FROM pg_class c JOIN pg_namespace n ON n.oid = c.relnamespace ),
sequences AS (SELECT oid,fqname FROM fq_objects WHERE relkind = 'S'),
tables AS (SELECT oid, fqname FROM fq_objects WHERE relkind = 'r' )
SELECT
s.fqname AS sequence,
'->' as depends,
t.fqname AS table
FROM
pg_depend d JOIN sequences s ON s.oid = d.objid
JOIN tables t ON t.oid = d.refobjid
WHERE
d.deptype = 'a' and t.fqname = 'cc';