FIELD_VIEW_DEFINITION, FIELD_VIEW_DEFINITION_UTF8, FIELD_VIEW_CHECK_OPTION, FIELD_VIEW_IS_UPDATABLE, FIELD_VIEW_ALGORITHM, FIELD_VIEW_SECURITY_TYPE, FIELD_VIEW_DEFINER, FIELD_VIEW_CLIENT_COLLATION_ID, FIELD_VIEW_CONNECTION_COLLATION_ID, FIELD_VIEW_COLUMN_NAMES, FIELD_LAST_CHECKED_FOR_UPGRADE_VER...
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...
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. 2. 3. 4. 我们可以通过上述两种方法来查看视图employee_view的代码。
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...
tablespace_definition_cache:存储tablespace定义 另外还有character,collation,event,column_statistics也有cache,不过其大小硬编码不可配置: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 classShared_dictionary_cache{...Shared_multi_map<Abstract_table>m_abstract_table_map;Shared_multi_map<Charset>m_charset...
随着移动互联网的结束与人工智能的到来大数据变成越来越重要,下一个成功者应该是拥有海量数据的,数据与数据库你应该知道。 一、数据库概要 数据库(Database)是存储与管理数据的软件系统,就像一个存入数据的物流仓库。 在商业领域,信息就意味着商机,取得信息的一个非常重要的途径就是对数据进行分析处理,这就催生了各种...
[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 ...
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 ...
[DBA,ALL,USER]_MVIEW_COMMENTS [DBA,ALL,USER]_USERS [DBA,ALL]_DIRECTORIES DBA_ROLES [DBA,USER]_ROLE_PRIVS [DBA,ALL,USER]_TAB_PRIVS PRODUCT_COMPONENT_VERSION PLAN_TABLE DBA_SOURCE_ALL NLS_DATABASE_PARAMETERS NLS_INSTANCE_PARAMETERS