SELECTVIEW_DEFINITIONFROMINFORMATION_SCHEMA.VIEWSWHERETABLE_NAME='view_name'; 1. 2. 3. 示例 假设我们有一个名为employee_view的视图,其查询语句如下: CREATEVIEWemployee_viewASSELECTid,name,departmentFROMemployeeWHEREdepartment='IT'; 1
9.1.1.1.3 The View Menu This context-aware menu features general options for changing the view in MySQL Workbench. These options change depending on the current tab, and here are the availableViewmenu items: General options: Home: Selects the home screen. ...
set_definition_utf8() : dd::Event, dd::Event_impl, dd::Function_impl, dd::Library_impl, dd::Procedure_impl, dd::Routine, dd::Routine_impl, dd::View, dd::View_impl set_delay() : connection_control::Connection_delay_action set_delayed_view_change_resumed() : Pipeline_event set_dela...
table_definition_cache:存储表定义 schema_definition_cache:存储schema定义 stored_program_definition_cache:存储proc和func定义 tablespace_definition_cache:存储tablespace定义 4、INFORMATION_SCHEMA和数据字典集成 4.1 INFORMATION_SCHEMA表被实现为数据字典表的视图(35个) 表名 用途 CHARACTER_SETS 提供有关可用字符集的...
[reference_definition] or ALTER [COLUMN] col_name {SET DEFAULT literal | DROP DEFAULT} or CHANGE [COLUMN] old_col_name create_definition [FIRST | AFTER column_name] or MODIFY [COLUMN] create_definition [FIRST | AFTER column_name] or DROP [COLUMN] col_name or DROP PRIMARY KEY or DROP ...
· 错误:1013 SQLSTATE: HY000 (ER_CANT_GET_STAT) 消息:无法获取'%s'的状态(errno: %d) · 错误:1014 SQLSTATE: HY000 (ER_CANT_GET_WD) 消息:无法获得工作目录(errno: %d) · 错误:1015 SQLSTATE: HY000 (ER_CANT_LOCK) 消息:无法锁定文件(errno: %d) · 错误:1016 SQLSTATE: HY000 (ER_CANT_...
数据定义语言(Data Definition Language,DDL)是 SQL 语言集中负责数据结构定义与数据库对象定义的语言。 DDL 的主要功能是定义数据库对象。 DDL 的核心指令是CREATE、ALTER、DROP。 数据操纵语言(DML) 数据操纵语言(Data Manipulation Language, DML)是用于数据库操作,对数据库其中的对象和数据运行访问工作的编程语句。
All key segments have their own language definition. This will enable MySQL to have different language definitions per column. A hashed computed index can be used for UNIQUE. This will allow you to have UNIQUE on any combination of columns in a table. (You can’t search on a UNIQUE ...
The View.ViewExpr AST object seems to drop aliasing information that we depend on for query schema presentation. I want to circle back to have the view AST expression be consistent with the view definition, but this forces a re-parsing to get the correct view schema.2100...
4. Improve view parser for oracle; 5. Use UNION ALL instead of UNION in RuleOrCond4SelectRewriteif if there are LIMIT & ORDERBY clauses; 6. Other bug fixing. Version 2024.1.7 1. fix a bug related to TableNested in QueryStatementHelper.getJoinSearchCondition. 2. local ind...