SQL手册的相关内容

文章 2021-10-29 来自：开发者社区

PolarDB-X 1.0-SQL 手册-DDL任务管理-常见场景与限制

新DDL执行引擎引入任务管理，外部行为与之前版本相比有所变化。本文将介绍相关的常见场景与限制。典型的应用场景DDL正常执行成功时，无需关注DDL任务的状态，已成功完成的DDL任务会被自动清理。建议执行DDL成功后，立即执行CHECK TABLE检查确认逻辑表的一致性。DDL执行失败时，会返回导致失败的错误码和错误信息，您也可以通过SHOW DDL查看PENDING状态的DDL任务失败的原因（即R....

文章 2021-10-29 来自：开发者社区

PolarDB-X 1.0-SQL 手册-DDL任务管理-最佳实践

本文将介绍一些对PENDING任务进行合适处理的最佳实践。背景介绍新的DDL任务引擎启用时，当DDL执行失败或者被意外中断后，对应的DDL任务会处于PENDING待处理的状态，此时必须对该PENDING状态进行合适的任务处理，才能解除PENDING状态并恢复正常访问，否则后续的DDL将会被禁止执行并报错。处理原则您可以通过SHOW [FULL] DDL语句查看DDL任务的信息和失败原因（即REM....

文章 2021-10-29 来自：开发者社区

PolarDB-X 1.0-SQL 手册-DDL-CREATE TABLE

注意事项PolarDB-X 1.0目前不支持使用DDL语句直接建库，请登录云原生分布式数据库控制台进行创建。关于如何创建数据库，详情请参见创建数据库。PolarDB-X 1.0支持全局二级索引 (Global Secondary Index，GSI) ，要求MySQL版本为5.7或以上，并且PolarDB-X 1.0实例版本为5.4.1或以上，基本原理请参见全局二级索引。CREATE [SHAD....

文章 2021-10-29 来自：开发者社区

PolarDB-X 1.0-SQL 手册-DDL-DROP TABLE

语法：DROP [TEMPORARY] TABLE [IF EXISTS] tbl_name [, tbl_name]... [RESTRICT | CASCADE]通过 DRDS 删除表与删除 MySQL 表没有区别，系统会自动处理相关物理表的删除操作，详细语法请参见MySQL 删除表语法。删除表 user_logDROP TABLE use....

文章 2021-10-29 来自：开发者社区

PolarDB-X 1.0-SQL 手册-DDL-ALTER TABLE

语法ALTER [ONLINE|OFFLINE][IGNORE] TABLE tbl_name [alter_specification [, alter_specification]...] [partition_options]ALTER TABLE用于改变表的结构，如增加列、增加索引和修改数据定义。详细语法请参见MySQL修改表语法。不允....

文章 2021-10-29 来自：开发者社区

PolarDB-X 1.0-SQL 手册-DDL-TRUNCATE TABLE

TRUNCATE TABLE 用于清空表中的数据，需要有 DROP 权限。语法TRUNCATE [TABLE] tbl_name详细语法参考 MySQL 文档。

文章 2021-10-29 来自：开发者社区

PolarDB-X 1.0-SQL 手册-DDL-RENAME TABLE

您可以使用RENAME TABLE语句对表名进行重命名，具体语法如下：RENAME TABLE tbl_name TO new_tbl_namePolarDB-X不支持同时RENAME多张表。考虑到稳定性和性能，目前禁止重命名包含全局二级索引的表。禁止单独重命名索引表。如需重命名索引，请参见ALTER TABLE 中RENAME INDEX推荐的方法。

文章 2021-10-29 来自：开发者社区

PolarDB-X 1.0-SQL 手册-DDL-CREATE INDEX

PolarDB-X支持创建局部索引和全局二级索引 (Global Secondary Index, GSI) ，同时支持删除这两种索引。PolarDB-X全局二级索引要求MySQL版本需为5.7或以上，且内核小版本需为5.4.1或以上。关于全局二级索引基本原理，请参见全局二级索引.局部索引关于局部索引，详情请参见CREATE INDEX。全局二级索引语法：CREATE [UNIQUE] &...

文章 2021-10-29 来自：开发者社区

PolarDB-X 1.0-SQL 手册-DDL-DROP INDEX

PolarDB-X支持创建局部索引和全局二级索引，同时支持删除这两种索引。局部索引PolarDB-X中删除局部索引的方法和MySQL中一致，详情请参见MySQL DROP INDEX。全局二级索引语法：DROP INDEX index_name ON tbl_nameindex_name为需要删除的全局二级索引名。

文章 2021-10-29 来自：开发者社区

PolarDB-X 1.0-SQL 手册-DDL-CREATE VIEW

本文将介绍如何使用CREATE VIEW语句为PolarDB-X创建视图。前提条件PolarDB-X实例版本需为5.4.5或以上，关于如何查看实例版本，请参见实例版本概览。语法CREATE [OR REPLACE] VIEW view_name [(column_list)] AS select_statement示例# 先建表 CREATE TABLE t_order ...

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云数据库SQL Server，具有企业许可授权，权限更为开放，引擎功能更为强大。能完美支持Windows平台的.NET架构，支持复杂SQL查询，性能优秀，并有强大的可视化管理工具，帮助您轻松管理数据。

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