However, some queries that use unsupported data types will run on the leader node but not on the compute nodes. See SQL functions supported on the leader node. For a list of the supported data types, see Data t
分区键离散,可以使用PARTITION BY LIST。按字符串匹配决定落入哪个分区。 分区键连续,比如整形、日期等,可以使用PARTITION BY RANGE。 分区键数据随机无规律或规律简单,可以使用PARTITION BY HASH,用hash函数打散数据。 分区键数据随机有规律,规律复杂,可以使用多级混合分区,使数据平均分散、减少耦合。 每个分区都是一个...
postgres=# \df List of functionsSchema | Name | Result data type | Argument data types | Type---+---+---+---
ERROR: VALUE too long FOR TYPE CHARACTER VARYING(9) 改变表或者列 当你需要改变一个域的定义时,你可以使用ALTER这一 SQL 关键字。例如,如果你想改变wordlist域中最多只能有 9 个字符的限制,你可以重新设置这个数据类型。 exampledb=> ALTER TABLE my_sample_table ALTER COLUMN wordlist SET DATA TYPE VARC...
UPDATE [ ONLY ] table SET column = { expression | DEFAULT } [, ...] [ FROM from_list ] [ WHERE condition ]VACUUM垃圾收集以及可选地分析一个数据库。VACUUM [ FULL ] [ FREEZE ] [ VERBOSE ] [ table ] VACUUM [ FULL ] [ FREEZE ] [ VERBOSE ] ANALYZE [ table [ (column [, ...]...
TYPE U U \dT+ PostgreSQL 中使用 aclitem 来表示一个具体的数据库对象上的权限。对于 database 和 schema,aclitem 存储在 pg_database.datacl 和 pg_namespace.nspacl 中,对于 table,view 等其他数据库对象,pg_class.relacl 中保存了 aclitem 的一个 list。对于列级别的权限,aclitem 将保存在 pg_attrib...
Get the type property: Type of dataset. Overrides: PostgreSqlTableDataset.type() Returns: the type value.validate public void validate() Validates the instance. Overrides: PostgreSqlTableDataset.validate() withAnnotations public PostgreSqlTableDataset withAnnotations(List annotations) Set the annotations ...
This operation gets tables from a database. Returns Represents a list of tables. Body TablesList Insert rowOperation ID: PostItem This operation inserts a new row into a table. Parameters 展开表 NameKeyRequiredTypeDescription Table name table True string Name of table Row item True dynamic ...
When using range partitioning, the partition key can includemultiplecolumnsorexpressions,butfor list partitioning, the partition key must consist of a single columnorexpression. If nobtreeoperator class is specified when creating a partitioned table, the defaultbtreeoperator class for the datatype will...
In theDatabaseslist, choose the name of the new PostgreSQL DB instance to show its details. The DB instance has a status ofCreatinguntil it is ready to use. When the status changes toAvailable, you can connect to the DB instance. Depending on the DB instance class and the amount of...