Thus, when you fetch aTimestampvalue from PostgreSQL through ActiveRecord, ActiveRecord converts it into a RubyTimeobject, which represents the date, time, and time zone (UTC in this case, if not specified otherwise). This behavior underscores ActiveRecord's design to map SQL data types to Rub...
In postgres, I'm getting an error when I try to union two tables where one table has a column (Amount) containing double precision data type, and the other table does not have a matching column and I'd like the records from that table to just have NULL in the Amount field. Error: ...
Starting in PostgreSQL 9.0, you have the ability to GRANT [priv name] ON ALL [object type] IN SCHEMA where [priv name] is the typical SELECT, INSERT, UPDATE, DELETE, etc and [object type] can be one of: TABLES SEQUENCES FUNCTIONS PostgreSQL's docs on GRANT and REVOKE go in to more...
* column types is added, too. (Note that the child nodes do not necessarily * produce these types directly, but we've checked that their output types * can be coerced to the output column type.) Also, if it's not UNION ALL, * information about the types' sort/group semantics is pro...
在PostgreSQL 的地理数据库中,使用 PostGIS 类型的要素类将包含一个针对 CAD 和曲线存储的字段:GDB_GEOMATTR_DATA。 如果在 ArcGIS 外部创建一个空间表并将表注册到地理数据库,则该字段将被添加到表中。 PostGIS 地理类型限制可处理形状的大小。 有关详细信息,请参阅 PostGIS 文档。 授予创建 PostGIS 几何或地...
PostgreSQL: why altering default privileges in specific schema to revoke all privileges on types from PUBLIC does nothing? 4 Grant usage to a schema from another database 1 Grant privileges to tables in all (dynamic) schemas Hot Network Questions Prince Rupert's Drop Armor: How Expensive?
The PostgreSQL UNION ALL operator provides the combined result sets of more than one SELECT statement. The result contains all rows from the query without removing duplicate rows between multiple SELECT statements. Generally, the UNION operator is used in the reporting or data warehouse system to co...
I don't know postgresql but shouldn't the following work? select id from t1 join t2 on t1.type = t2.type group by id having count(1) = (select count(1) from t2) You are selecting the ID values. The join means the type value on t1 must exist in t2. ...
本节介绍了PostgreSQL中逻辑备份的工具pg_dumpall和pg_dump。 pg_dumpall和pg_dump都是PG提供的逻辑备份工具,顾名思义,pg_dumpall可以一键dump所有的数据库,而pg_dump只能逐个database处理,下面来详细对比两个工具的异同。 pg_dumpall pg_dumpall可以一键dump database cluster,dump文件的格式为plain text file,...
PG数据库升级步骤说明(pg_dumpall和pg_upgrade),PostgreSQL版本升级测试,9.4升级到9.5,使用pg_dumpall、pg_upgrade两种方式。