SQL> create table system.test(name char(10)); Table created. SQL> insert into test values(‘scott’); 1 row created. SQL> insert into system.test values(‘system’); 1 row created. SQL> commit; Commit complete.
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...
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...
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. ...
在Schema语法打开的情况下,对未升级的项目,数据路径写法为projectname.default.tablename。 在Schema语法关闭情况下,对于已升级的项目,无法访问自定义Schema,写法为projectname.tablename仅会识别DEFAULT这个Schema下的数据。 使用说明 关于使用Schema的说明如下。
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...
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...
SQL CREATETABLEdbo.Region (Region_idINTNOTNULL, Region_NameCHAR(5)NOTNULL)WITH(DISTRIBUTION =REPLICATE); GOCREATESCHEMASales; GOALTERSCHEMASales TRANSFEROBJECT::dbo.Region; GO 相關內容 其他資源 事件 FabCon 維也納 9月15日 下午2時 - 9月17日 下午11時 ...
sql_identifier 是XML 架构集合的 SQL 标识符。 表达式 字符串常量或标量变量。 为 varchar、varbinary、nvarchar 或 xml 类型。 注解 通过ALTER XML SCHEMA COLLECTION,还可以向集合中添加新命名空间或向集合的现有命名空间中添加新组件。 若要删除集合,请使用DROP XML SCHEMA COLLECTION (Transact SQL)。