查询postgresql表结构和索引

通过系统数据字典查询表结构

select
col.table_schema,
col.table_name,
col.ordinal_position,
col.column_name,
col.data_type,
col.character_maximum_length,
col.numeric_precision,
col.numeric_scale,
col.is_nullable,
col.column_default,
des.description
from
information_schema.columns col left join pg_description des on
col.table_name::regclass = des.objoid
and col.ordinal_position = des.objsubid
where
table_schema = 'public'
and table_name = 't_student'
order by
ordinal_position;

select * from information_schema.columns
where table_schema='public' and table_name='t_student';

通过系统数据字典查询索引信息

select
A.SCHEMANAME,
A.TABLENAME,
A.INDEXNAME,
A.TABLESPACE,
A.INDEXDEF,
B.AMNAME,
C.INDEXRELID,
C.INDNATTS,
C.INDISUNIQUE,
C.INDISPRIMARY,
C.INDISCLUSTERED,
D.DESCRIPTION
from
PG_AM B left join PG_CLASS F on
B.OID = F.RELAM left join PG_STAT_ALL_INDEXES E on
F.OID = E.INDEXRELID left join PG_INDEX C on
E.INDEXRELID = C.INDEXRELID left outer join PG_DESCRIPTION D on
C.INDEXRELID = D.OBJOID,
PG_INDEXES A
where
A.SCHEMANAME = E.SCHEMANAME
and A.TABLENAME = E.RELNAME
and A.INDEXNAME = E.INDEXRELNAME
and E.SCHEMANAME = 'public'
and E.RELNAME = 't_student';

查询所有的表名
select
n.nspname,
relname
from
pg_class c,
pg_namespace n
where
c.relnamespace = n.oid
and nspname = 'public'
and relkind = 'r'
order by
relname;