select * from pg_roles; ●查看当前时间 now() select now() ●查看表所有字段 select * from information_schema.columns where table_schema='public' and table_name='student'; ●查看数据库所有表名 select tablename from pg_tables where schemaname='public' 2、按条件查询 ●升降序 -- 对查询结果...
#PostgreSQL# select * from pg_tables; 表明有大写要双引号包含。 select * from "Users";
select pg_size_pretty(pg_total_relation_size('table_name')) as size; 5、查看表中索引大小 select pg_size_pretty(pg_indexes_size('product')); 6、获取各个表中的数据记录数 select relname as TABLE_NAME, reltuples as rowCounts from pg_class where relkind = 'r' order by rowCounts desc 7...
但特别需要注意,该强制删除用户因为是级联删除,因此,很大概率会把依赖的schema和table都删除,所以此方式强制删除用户需要提前备份,防止发生不测。 test1=# \du+List of rolesRole name | Attributes | Member of | Description---+---+---+---drmc | | {} |pg1 | Superuser, Create role, Create DB,...
查看表和数据库的信息查询表信息 使用系统表pg_tables查询数据库所有表的信息。 1 SELECT * FROM pg_tables; 使用gsql的\d+命令查询表结构。 示例:先创建表customer_t1并插入数据。 1 2 3 4 5 6 7 8 9 CREATE 来自:帮助中心 查看更多 → 如何查看RDS for MySQL数据库的死锁日志 ...
AS "table_name", pg_size_pretty(pg_table_size...,系统中是否正在有正在工作的 autovacuum 的进程, 并且这些进程在做什么操作 SELECT psa.pid,granted,query FROM pg_locks pl LEFT JOIN...SELECT psa.pid,granted,query,now() - psa.xact_start as running_time, psa.state, psa.usename FROM pg_...
查看表和数据库的信息查询表信息 使用系统表pg_tables查询数据库所有表的信息。 1 SELECT * FROM pg_tables; 使用gsql的\d+命令查询表结构。 示例:先创建表customer_t1并插入数据。 1 2 3 4 5 6 7 8 9 CREATE 来自:帮助中心 查看更多 → 回滚表结构 ...
...select * from cte_order pivot(sum (qty) for custid in(A,B,C,D)) as newtable SQL Server 2008引入了merge语句...,它能在一条语句中根据不同的逻辑进行不同的操作,比如可以根据不同的逻辑进行(delete,update,insert); Merge是基于连接语义的,在merge子句中指定目标表的名称,在using子句中指定...
> > pg_tables:https://www.postgresql.org/docs/9.5/view-pg-tables.html> > tablespace name pg_tablespace.spcname Name of tablespace containing table > > (null if default for database)" > > Thanks, but I didn't do that. I have an existing database that's on data2 ...
Retrieves data from a table or view. Serving as an overlaid filter for a database table, SELECT filters required data from the table using SQL keywords.Precautions The owner of the table, users granted with the SELECT permission on the table, and users granted with the SELECT ANY TABLE per...