select * from (select * from ud_order where user_id=10 and status=2unionselect * from ud_order where user_id=0 and status=2 and order_info->'orderContact'->>'email' = '222@163.com') a where 1=1 select * from ud_order where (user_id=10 and status=
mongodb pg mysql jsonb对比 http://erthalion.info/2017/12/21/advanced-json-benchmarks/ 使用禁用jsonb列的压缩 ALTER TABLE table_name ALTER COLUMN column SET STORAGE EXTERNAL.在这种情况下,您可以或多或少地通过磁盘空间的成本来避免开销. 解除列压缩的限制,可以提高性能?
1.创建测试表 CREATE TABLE big_data( id character varying(50) NOT NULL, name character varying(50), datetime timestamp with time zone, CONSTRAINT big_data_pkey PRIMARY KEY (id))WITH ( OIDS=FALSE);ALTER TABLE big_data OWNER TO postgres; 2.创建插入数据函数 CRE
不需要排序 select (row_number() over()) as id from generate_series(1,100)1根据指定的字段排序 select (row_number() over(order by xxx desc)) as id,xxx from generate_series(1,100) as xxx--------------------- 作者:kmblack1 来源:CSDN 原文:https://blog.csdn.net/kmblack1/artic
1 查找锁表的pid select pid from pg_locks l join pg_class t on l.relation = t.oid where t.relkind = 'r' and t.relname = 'lockedtable'; 2 查找锁表的语句 select pid, state, usename, query, query_start from pg_stat_activity where pid in ( select pid from pg_locks l
PostgreSQL相关的软件,库,工具和资源集合. 备份 wal-e - Simple Continuous Archiving for Postgres to S3, Azure, or Swift by Heroku Barman - Backup and Recovery Manager for Postgres by 2ndQuadrant GUI pgAdmin - Postgres Administration and Management GUI phpPgAdmin - The
