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...
postgres=# \d+ example_tbl Table "public.example_tbl"Column | Type | Collation | Nullable | Default | Storage | Compression | Stats target | Description---+---+---+---+---+---+---+---+---id | integer | | not null | | plain | ...
format('CREATE TABLE tab_%s (LIKE tab INCLUDING INDEXES)', dateStr); EXECUTE format('ALTER TABLE tab ATTACH PARTITION tab_%s FOR VALUES IN (%L)', dateStr, dateStr); RETURN1; END; $$; CREATE EXTENSION pg_cron; SELECT cron.schedule('0 14 * * *',$$SELECT create_tab_par...
-- 整个数据库仅有一个名为 some_info 的表情况下selectpgc.oid, (selectnspnamefrompg_namespace pgnswherepgns.oid=pgc.relnamespace)asschemaname, pgc.relnameastablename, (selectdescriptionfrompg_description pgdswherepgds.objoid=pgc.oidandobjsubid=0)asdescriptionfrompg_class pgcwherepgc.relname='s...
1testtable|i|1(7rows)--只查看用户自定义字段的类型*postgres=#SELECTrelname,attname,typnameFROMpg_class c,pg_attribute a,pg_type tWHEREc.relname='testtable'ANDc.oid=attrelidANDatttypid=t.oidANDattnum>0;*relname|attname|typname---+---+---testtable|i|int4 (7rows) pg_attrdef 该系统表...
SELECT s.relname AS table_name, indexrelname AS index_name, i.indisunique, idx_scan AS index_scans FROM pg_catalog.pg_stat_user_indexes s, pg_index i WHERE i.indexrelid=s.indexrelid; 12.查找重复索引 SELECT indrelid::regclass table_name, ...
GRANT ALL PRIVILEGES ON ALL TABLES IN SCHEMA public TO username; 三、数据库表或者索引 1、获取数据库表中的索引 select * from pg_indexes where tablename = 'product'; 2、获取当前db中所有表信息 select * from pg_tables; 3、查询数据库安装了哪些扩展 ...
select * from pg_class where relkind='S' 1. 2. 3. 2、查找Sequence中的值 SELECT nextval(‘seq_commodity’); 这里nextval表示下一个值 3、查看表中的 序列 david=# \d tbl_xulie Table "public.tbl_xulie" Column | Type | Modifiers ...
Postgresql 存在许多特定的索引查询类型,和大部分的Btree为基础架构的关系型数据库一样,在创建索引缺省的时候会把btree作为默认值。
SELECT * FROM pg_indexes WHERE tablename = 'persons'; 这将列出 persons表上的所有索引,包括您刚刚创建的 persons_age_idx。 现在,您的 persons 表已经创建完毕,包含了多条数据,并且在 age 字段上有了索引,这将有助于加速基于年龄的查询。记得在生产环境中,创建索引之前要评估其对写入性能的影响,因为索引会...