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-DROP VIEW

本文将介绍如何使用DROP VIEW语句删除PolarDB-X的视图。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DROP VIEW [IF EXISTS] view_name示例# 创建视图create view v as select 1; # 删除视图drop view v;上一篇：CREATE VIEW

文章 2021-10-29 来自：开发者社区

PolarDB-X 1.0-SQL 手册-DDL-DDL常见问题

建表的时候执行出错怎么办？DDL的执行是一个分布式处理过程，出错可能导致各个分片表结构不一致，所以需要进行手动清理，详细操作步骤如下：PolarDB-X会提供基本的错误描述信息，比如语法错误等。如果错误信息太长，则会提示您使用SHOW WARNINGS的命令来查看每个分库执行失败的原因。您可以通过SHOW TOPOLOGY命令来查看物理表的拓扑结构。SHOW TOPOLOGY FROM mult....

文章 2021-10-29 来自：开发者社区

PolarDB-X 1.0-SQL 手册-DML-SELECT

SELECT 用于从一个或多个表中查询数据。SELECT [ALL | DISTINCT] select_expr [, select_expr ...] [FROM table_references [WHERE where_condition] [GROUP BY....

文章 2021-10-29 来自：开发者社区

PolarDB-X 1.0-SQL 手册-DML-子查询

本文介绍PolarDB-X支持的子查询类别及在PolarDB-X中使用子查询的相关限制和注意事项。使用限制相比原生MySQL，PolarDB-X在子查询使用上增加了如下限制：不支持在HAVING子句中使用子查询，示例如下：SELECT name, AVG( quantity ) FROM tb1 GROUP BY name HAVING AVG( quantity ) > 2* ( ...

文章 2021-10-29 来自：开发者社区

PolarDB-X 1.0-SQL 手册-DML-INSERT

您可以使用INSERT语句往表中插入数据。语法INSERT [LOW_PRIORITY | DELAYED | HIGH_PRIORITY] [IGNORE] [INTO] [schema_name.]tbl_name [(col_name [, col_name] ...)] {VALUES | VALUE} (value_list) [, (value_list)] [ON DUPLICAT....

文章 2021-10-29 来自：开发者社区

PolarDB-X 1.0-SQL 手册-DML-REPLACE

语法REPLACE [LOW_PRIORITY | DELAYED] [INTO] [schema_name.]tbl_name [(col_name [, col_name] ...)] {VALUES | VALUE} (value_list) [, (value_list)] REPLACE [LOW_PRIORITY | DELAYED] [INTO] [schema_name.]tbl....

文章 2021-10-29 来自：开发者社区

PolarDB-X 1.0-SQL 手册-DML-UPDATE

您可以使用UPDATE语法修改表中符合条件的行。语法单逻辑表UPDATE [LOW_PRIORITY] [IGNORE] [schema_name.]tbl_name SET assignment_list [WHERE where_condition] value: {expr | DEFAULT} assignment: col_name = value as...

文章 2021-10-29 来自：开发者社区

PolarDB-X 1.0-SQL 手册-DML-DELETE

您可以使用DELETE语句删除表中符合条件的行。语法下述DELETE语句表示从 tbl_name中删除满足where_condition的行，并返回删除的行数；若没有WHERE条件，将删除表中所有的数据。单逻辑表DELETE [LOW_PRIORITY] [QUICK] [IGNORE] FROM [schema_name.]tbl_name [WHERE where_condition...

文章 2021-10-29 来自：开发者社区

PolarDB-X 1.0-SQL 手册-DML-全局二级索引对DML的限制

本文将介绍PolarDB-X上全局二级索引对DML的限制。前提条件MySQL版本需为5.7或以上，且PolarDB-X实例版本需为5.4.1或以上，关于如何查看实例版本，请参见实例版本概览。示例本文将以下表为例介绍全局二级索引对DML的不同限制：CREATE TABLE t_order( `id` bigint(11) NOT NULL AUTO_INCREMENT, `order_id...

文章 2021-10-29 来自：开发者社区

PolarDB-X 1.0-SQL 手册-SHOW-SHOW-SHOW HELP

SHOW HELP 展示 DRDS 所有辅助 SQL 指令及其说明。mysql> show help;+-----------------------------------------+---------------------------------------------------------+--------------------------------------------....

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