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允许进行DML操作的视图条件

首先我们看下官方文档对视图进行DML操作的要求说明： The following notes apply to updatable views: An updatable view is one you...The information displayed by this view is meaningful only for inherently updatable views. ... list A subquery in a SELECT list A subquery designated WITH READ ONLY Joins, with some exceptions...In addition, if an inherently updatable view contains pseudocolumns or expressions, then you cannot update...DELETE语句，如果join结果有多个key-preserved表，Oracle只会删除FROM子句中第一个表的记录，不管视图是否使用WITH CHECK OPTION。

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Oracle查询优化-04插入、更新与删除数据

SQL> create or replace view test_xgj_view as select c1 , c2 ,c3 from test_xgj ;...c3) values (default ,NULL ,'C3') ORA-32575: Explicit column default is not supported for modifying views...然后我们来看一下视图包含的结果 SQL> create or replace view xgj 2 as 3 select empno,ename from emp where ename...like 'J%' 4 with check option; View created SQL> select * from xgj; EMPNO ENAME ----- -------...下面介绍三种方法通过name相同，id不同的方式来判断先查询下数据，确认无误 select * from xgj a where exists (select null from

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SQL 基础--> 视图(CREATE VIEW)

VIEW 子句修改视图删除视图： DROP VIEW view_name 视图中使用DML的规定：当视图定义中含有以下元素之一不能使用INSERT 组函数 GROUP BY、ORDER BY...USER_VIEWS --演示创建视图 SQL> create or replace view vw_emp as 2 select empno,ename,sal from emp where...select 9999,'Robinson',2000 from dual * ERROR at line 1: ORA-01402: view WITH CHECK OPTION where-clause...delete from vw_emp where empno = 7566 * ERROR at line 1: ORA-01752: cannot delete from view without...view_name,text from user_views; VIEW_NAME TEXT ------------------------------ --------------------

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Mysql The user specified as a definer (test@%) does not exist

DEFINER = `root`@`%` SQL SECURITY DEFINER VIEW `v_ questions` AS SELECT `q`....`() LANGUAGE SQL NOT DETERMINISTIC CONTAINS SQL SQL SECURITY DEFINER COMMENT '' BEGIN select...我们再用user1进行登陆： mysql> use testdb; Database changed mysql> call user_count(); ERROR 1142 (42000): SELECT...from information_schema.VIEWS; select concat("alter DEFINER=`user`@`localhost` SQL SECURITY DEFINER...,TABLE_NAME," as ",VIEW_DEFINITION,";") from information_schema.VIEWS where DEFINER'user@localhost'

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＞＞技术应用：clickhouse 帮助命令一览表

for simple query SELECT FROM LIMIT....system.query_views_log table....--allow_push_predicate_when_subquery_contains_with arg Allows...push predicate when subquery contains WITH clause --low_cardinality_max_dictionary_size...--parallel_view_processing arg Enables pushing to attached views

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MySQL性能分析和索引优化

> 18; 输出 [image-20211003213247496] id select查询的序列号,包含一组数字，表示查询中执行select子句或操作表的顺序 id相同，执行顺序由上至下 id不同...，最外层查询则被标记为Primary SUBQUERY > > 在SELECT或WHERE列表中包含了子查询 DERIVED > > 在FROM列表中包含的子查询被标记为DERIVED(...> 若第二个SELECT出现在UNION之后，则被标记为UNION；若UNION包含在FROM子句的子查询中,外层SELECT将被标记为：DERIVED UNION RESULT > >...> index\_subquery > 利用索引来关联子查询，不再全表扫描。 > unique\_subquery > 该联接类型类似于index\_subquery。...id FROM article WHERE category\_id = 1 AND comments > 1 ORDER BY views DESC LIMIT 1; 利用EXPLAIN分析

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关于inline view内嵌视图的学习

例如select ... from (select ... from (select ...))...，这里作为from表来使用的select语句创建的就是一个内嵌视图，个人理解，之所以叫内嵌，就是因为它是放在一个语句中的，而且可以多次嵌套，但这种内嵌视图只能在当前的SQL中使用，不能像CREATE VIEW...再来看看Concept中对它的定义： Inline Views An inline view is not a schema object....The query --------- select count(*) from (select count(*) as numLLEids from LaborLevelEntry...= 'TAYLOR'); Correlated subquery (both executes simultaneously): SELECT ename, deptno, sal FROM

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MySQLMariaDB表表达式(3)：视图「建议收藏」

create view view1 as select * from t where a<10; create view view2 as select * from view1 where a>5;...例如： CREATE OR REPLACE VIEW my_view AS SELECT * FROM t ORDER BY id DESC ; SELECT * FROM my_view ORDER...from子句中的my_view替换为表t。加上视图定义语句中的where子句。...因此，select * from my_view;在执行的时候，会转换为下面的查询语句： select id,name from t where age<24; 如果查询my_view的时候，使用下面的语句...如下： select * from information_schema.views where table_name='view_name'; 5.检查无效视图在创建视图的时候，要求它的基表已存在，

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MySQL可更新视图

vw_items AS SELECT * FROM items WHERE price > 700; -- 查询视图 SELECT * FROM vw_items; -- 以下语句插入成功...vw_items_check2 CREATE OR REPLACE VIEW vw_items_check2 AS SELECT * FROM vw_items_check WHERE...OR REPLACE VIEW vw_items_check5 AS SELECT * FROM vw_items WHERE price < 1000 WITH CASCADED...• With CASCADED, the view WHERE clause is checked, then checking recurses to underlying views, adds...views, and applies the same rules. */ 七、结论： 1、不使用check子句情形，可以对视图进行DML操作，影响基表数据 2、使用check子句情形，所有的DML

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ORA-12034: “SCOTT＂.＂USER_TABLE” 上的实体化视图日志比上次刷新后的内容新

Therefore complete refresh is mandatory. 2、Creating the materialized view before the materialized view...a materialized view takes longer than the time it takes all other materialized views currently using...If there are other materialized views using the materialized view log on the master table, and all of...* from sys.slog$ SELECT SOWNER, VNAME, MOWNER, MASTER, to_char(SNAPTIME,'yyyy-mm-dd hh24:mi:ss') FROM...Log Younger Than Last Refresh (文档 ID 204127.1) （1）Error Definition and Description Error Definition

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T-SQL教程_sql server 2008使用

*/ FROM table_source /* FROM子句，指定表或视图 */ [ WHERE search_condition ] /* WHERE子句，指定查询条件 */ [ GROUP...----------- 2、选择查询语法格式：选择查询通过WHERE子句实现，WHERE子句给出查询条件，该子句必须紧跟FROM子句之后。...') /*自由式查询*/ | expression [ NOT ] IN ( subquery | expression [,…n] ) /*IN子句*/ | expression { = | } { ALL | SOME | ANY } ( subquery ) /*比较子查询*/ | EXIST ( subquery ) /*EXIST子查询*/ } 表1 查询条件 a.表达式比较...desc即可） select company,ordernumber from orders order by ordernumber desc -- having子句 select *from orderhaving

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触类旁通：那些关于 TBL$OR$IDX$PART$NUM 的诡异案例和知识

和这个参数相关的还有几个参数，通过参数描述就可以知道其作用： SQL> select ksppinm,ksppdesc from x$ksppi where ksppinm like '_subquery_pruning...") FROM (SELECT "BANS_INCT01"."...如果注意看，你会发现这个 SQL 的子查询 FROM 子句中没有 WHERE 条件。...确认一下： SQL> select obj# from view$ where rowid=DBMS_ROWID.ROWID_TO_EXTENDED ('00002F93.0006.0001','SYS...','VIEW$',0); OBJ# ---------- 4440 SQL> select object_name from dba_objects where object_id

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SQL高级查询方法

4.12 公用表表达式 WITH 4.8 子查询 subquery 子查询是一个嵌套在 SELECT、INSERT、UPDATE 或 DELETE 语句或其他子查询中的查询。...可以在 FROM 或 WHERE 子句中指定内部联接；而只能在 FROM 子句中指定外部联接。...若要用新名称引用结果集中的某列（例如在 ORDER BY 子句中），必须按第一个 SELECT 语句中的方式引用该列 SELECT city AS Cities FROM stores_west UNION...4.12 公用表表达式 WITH 公用表表达式 (CTE) 可以认为是在单个 SELECT、INSERT、UPDATE、DELETE 或 CREATE VIEW 语句的执行范围内定义的临时结果集。...CTE 也可用于 CREATE VIEW 语句，作为定义 SELECT 语句的一部分。

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mysql执行计划看是否最优

None 子查询中第一个SELECT DEPENDENTSUBQUERY dependent (true) 子查询中第一个SELECT,独立于外部查询 DERIVED None 子查询在 FROM子句中...MATERIALIZED materialized_from_subquery 物化子查询（不清楚是什么样的查询语句？）...#PRIMARY / DEPENDENT SUBQUERY [plain] view plain copy mysql> explain select * from tabname...index_subquery > range > index > ALL #system mysql> explain select id from(select id from tabname...>now()) AND name<'kk'; #unique_subquery mysql> explain select * from tabname where tid in(select

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mysql执行计划看是否最优

None 子查询中第一个SELECT DEPENDENTSUBQUERY dependent (true) 子查询中第一个SELECT,独立于外部查询 DERIVED None 子查询在 FROM子句中...MATERIALIZED materialized_from_subquery 物化子查询（不清楚是什么样的查询语句？）...#PRIMARY / DEPENDENT SUBQUERY [plain] view plain copy mysql> explain select * from tabname a where...index_subquery > range > index > ALL #system mysql> explain select id from(select id from tabname...>now()) AND name<'kk'; #unique_subquery mysql> explain select * from tabname where tid in(select

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【Oracle】-【权限-ORA-04043】- ORA-04043: object SYS.V_$DATABASE does not exist

dcsopen * ERROR at line 1: ORA-02030: can only select from fixed tables/views 不让赋予它的查询权限...ERROR at line 1: ORA-02030: can only select from fixed tables/views 仍旧不允许赋予查询v$instance的权限。...ERROR at line 1: ORA-02030: can only select from fixed tables/views 也是不允许。...有帖子建议别查询传统意义的视图字典了，查询v$fixed_view_definition这个， V$FIXED_VIEW_DEFINITION This view contains the definitions...SQL> SELECT view_definition 2 FROM v$fixed_view_definition 3 WHERE view_name = 'V$INSTANCE';

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《MySQL核心知识》第11章：视图

`stuno` SELECT * FROM stu_class 查看视图查看视图必须要有SHOW VIEW权限查看视图的方法包括：DESCRIBE、SHOW TABLE STATUS、SHOW...VIEWS表存储了关于数据库中的视图的信息通过对VIEWS表的查询可以查看数据库中所有视图的详细信息 SELECT * FROM `information_schema`....使用ALTER语句修改视图 stu_class ALTER VIEW stu_class AS SELECT stuno FROM student; 使用DESC查看 DESC stu_class...（4）定义视图的SELECT语句中使用了DISTINCT、UNION、TOP、GROUP BY 、HAVING子句删除视图删除视图使用DROP VIEW语法 DROP VIEW [IF EXISTS...where stuno=2; -- delete from stu_class where stuno=1 -- select * from stu_class; -- ...

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学习SQLite之路（四）

FROM table_name WHERE [condition]; （3）删除视图： DROP VIEW view_name; （4）实例： view.txt create view company_view...（2）子查询中的select子句： subquery_select.txt SELECT column_name [, column_name ] FROM table1 [, table2 ] WHERE...); （3）子查询中的insert子句：subquery_insert.txt INSERT INTO table_name [ (column1 [, column2 ]) ]...* from company where ID in(select ID from company); select * from company_bak; （4）子查询中的update子句：subquery_update.txt...company where AGE > 30); （5）子查询中的delete子句：subquery_delete.txt DELETE FROM TABLE_NAME [ WHERE OPERATOR

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Partitioning in SQL Server 2008

: SELECT * FROM sys.partition_functions The first thing that you would want to do is to test whether...SELECT * FROM SYS.PARTITION_RANGE_VALUES Though SQL Server does not directly support List Partitioning...SELECT * FROM SYS.PARTITION_SCHEMES To get the list of all data spaces SYS.DATASPACES catalog view may...be used: SELECT * FROM SYS.DATA_SPACES PARTITIONED TABLE After creation of a partition scheme, a table...SELECT * FROM SYS.CONFIGURATIONS WHERE NAME = 'max worker threads' This feature is also important in

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django添加自定义页面

import views # Your other patterns here urlpatterns += [ path('', views.flatpage), ]...django.contrib.flatpages import views urlpatterns += [ path('about-us/', views.flatpage, {'url'...Only requests which are successfully routed to a view via normal URL resolution apply view middleware...and used in your own views....particular flatpage: in the admin, a collapsed fieldset titled "Advanced options" (clicking will expand it) contains

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允许进行DML操作的视图条件

Oracle查询优化-04插入、更新与删除数据

SQL 基础--> 视图(CREATE VIEW)

Mysql The user specified as a definer (test@%) does not exist

＞＞技术应用：clickhouse 帮助命令一览表

MySQL性能分析和索引优化

关于inline view内嵌视图的学习

MySQLMariaDB表表达式(3)：视图「建议收藏」

MySQL可更新视图

ORA-12034: “SCOTT＂.＂USER_TABLE” 上的实体化视图日志比上次刷新后的内容新

T-SQL教程_sql server 2008使用

触类旁通：那些关于 TBL$OR$IDX$PART$NUM 的诡异案例和知识

SQL高级查询方法

mysql执行计划看是否最优

mysql执行计划看是否最优

【Oracle】-【权限-ORA-04043】- ORA-04043: object SYS.V_$DATABASE does not exist

《MySQL核心知识》第11章：视图

学习SQLite之路（四）

Partitioning in SQL Server 2008

django添加自定义页面

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