It can contain views, temporary tables, and indexes. The chapter focuses at those structural elements and modifies all parts of a schema. A view is a virtual table that is produced by executing a SQL query. It is stored in the data dictionary as a named SELECT. Whenever a SQL query ...
However, a primary key isn't mandatory in ANSI SQL, and it isn't required in SQL Server. The job of the primary key is to set a unique identifier for each row in the table and to allow SQL Server to create a unique index on this key. Indexes are user-defined data structures that ...
To sum up, we have discussed SQL Server tables and views, along with their key features and differences. Tables serve as the primary storage structure, holding data in an organized, accessible format. Views, on the other hand, provide a virtual representation of this data, simplifying complex ...
Azure SQL Managed Instance You can create apartitioned table or indexin SQL Server, Azure SQL Database, and Azure SQL Managed Instance by using SQL Server Management Studio or Transact-SQL. The data in partitioned tables and indexes is horizontally divided into units that can be spread across...
there could be footnotes and a reference to the page. A Data page in SQL Server has similar elements. A Data page consists of an area called the header consuming 96 bytes of space. The header contains information like the amount of free space, the next page, and a dozen other elements....
Taispeáin 2 eile Applies to: SQL Server Azure SQL Database Azure SQL Managed InstanceSQL Server, Azure SQL Database, and Azure SQL Managed Instance support table and index partitioning. The data of partitioned tables and indexes is divided into units that may be spread across more than one...
Applies to: SQL Server Azure SQL Managed InstancePartitioning makes large tables or indexes more manageable because partitioning enables you to manage and access subsets of data quickly and efficiently, and maintain the integrity of a data collection at the same ...
SQL Server, Azure SQL Database, and Azure SQL Managed Instance support table and index partitioning. The data of partitioned tables and indexes is divided into units that may be spread across more than one filegroup in a database or stored in a single filegroup. When multiple files exist in...
For InnoDB, INDEX_LENGTH is the approximate amount of space allocated for non-clustered indexes, in bytes. Specifically, it is the sum of non-clustered index sizes, in pages, multiplied by the InnoDB page size. Refer to the notes at the end of this section for information regarding other...
Show Tables/Views/Partitions/Indexes Show Tables SHOW TABLES [IN database_name] ['identifier_with_wildcards']; 1. SHOW TABLES列出数据中所有的表。可以用LIKE子句与正则表达式过滤表列表。正则表达式中的通配符只能是匹配任意字符的"*“或表示可选的”|"。