1.查询sjcenter数据库里开头为sj_demo和sj_onlyinv的所有表的总条数 select sum(table_rows) from (select table_name,table_rows from tables where TABLE_SCHEMA = 'sjcenter' order by table_rows desc) as b where b.table_name like 'sj_demo%' or b.table_name like 'sj_onlyinv' 2.查询wangd...
information_schema.COLUMNS 对应于show columns from table_name 查看索引 information_schema.STATISTICS 对应于show index from table_name 查看线程 information_schema.PROCESSLIST 对应于 show processlist 二.MySQL 库表简介 在mysql数据库中,有mysql_install_db脚本初始化权限表,存储权限的表有: 1、user表: 用户列...
5.schema owner 不一定能操作其下面的某张表 (需要有表的权限,或table owner) 6、授予某个用户select on all tables in schema XX时,需要先对用户授权usage访问schema XX,否则会出现报错Invalid operation: permission denied for schema XX; grant usage on schema s9 to owner_2; grant select on all tables...
TABLE_ROWS is NULL for INFORMATION_SCHEMA tables. For InnoDB tables, the row count is only a rough estimate used in SQL optimization. (This is also true if the InnoDB table is partitioned.) AVG_ROW_LENGTH The average row length. Refer to the notes at the end of this section for...
MaxCompute支持Schema,允许在Project之下对Table、Resource、Function进行更细粒度的管理。本文为您介绍Schema的概念、权限内容以及如何使用Schema。 背景信息 MaxCompute项目(Project)作为基本组织单元,是进行多用户隔离和访问控制的主要边界。Project中包含表(Table)、资源(Resource)、函数(Function)对象,这些对象原来直接放在Pro...
dictionary. Traditionally, you would get this type of information using the techniques fromSection 17.17, “InnoDB Monitors”, setting upInnoDBmonitors and parsing the output from theSHOW ENGINE INNODB STATUSstatement. TheInnoDBINFORMATION_SCHEMAtable interface allows you to query this data using SQL. ...
我们格式化一下 SQL: 可以看到 MySQL 将 代码语言:javascript 代码运行次数:0 运行 AI代码解释 selectfromAwhereA.x notin(select xfromB)//非关联子查询 转换成了 代码语言:javascript 代码运行次数:0 运行 AI代码解释 selectfromAwhere notexists(select1fromBwhereB.x=a.x)//关联子查询 ...
UPDATE performance_schema.setup_instruments SET ENABLED= 'YES' WHERE NAME = 'statement/sql/truncate'; UPDATE performance_schema.setup_instruments SET ENABLED= 'YES' WHERE NAME = 'statement/sql/drop_table'; UPDATE performance_schema.setup_instruments SET ENABLED= 'YES' WHERE NAME = 'statement/sql...
syntaxsql -- Syntax for SQL Server and Azure SQL DatabaseCREATESCHEMAschema_name_clause[<schema_element>[ ...n ] ]<schema_name_clause>::={schema_name|AUTHORIZATIONowner_name|schema_nameAUTHORIZATIONowner_name}<schema_element>::={table_definition|view_definition|grant_statement|revoke_statement|de...
public boolean supportsSchemasInTableDefinitions() 傳回值 如果支援,則為 true。 否則為 false。 例外狀況 SQLServerException 備註 這個supportsSchemasInTableDefinitions 方法是由 java.sql.DatabaseMetaData 介面中的 supportsSchemasInTableDefinitions 方法指定。 另請參閱 SQLServerDatabaseMetaD...