How many types of tables are there in SQL?

Question

Can anyone tell me how many types of tables are there in SQL?

Answer 1

There are three types of tables in SQL such as base, view, and merged. The data in these tables has different properties from other tables.

Base: A table that is created by importing a CSV or spreadsheet.

View: A table that is populated by data from a base table.

Merged: A table formed by combining two or more tables into a single new table.

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Answer 2

Partitioned Tables

Partitioned tables are those whose data is horizontally divided into segments that can be distributed across multiple filegroups within a database. This approach enhances the manageability of large tables or indexes, allowing for quicker and more efficient access to or management of specific data subsets, all while preserving the overall integrity of the dataset.

Temporary Tables

Temporary tables are stored in tempdb and come in two types: local and global. Local temporary tables start with a single number sign (#) and are visible only to the current user, being deleted upon disconnection. Global temporary tables, marked by two number signs (##), are accessible to all users and are removed only when no user is referencing them.

System Tables

SQL Server stores the data that defines the configuration of the server and all its tables in a special set of tables known as system tables. Users cannot directly query or update the system tables. The information in the system tables is made available through the system views. For more information, see System Views (Transact-SQL).

Wide Tables

Wide tables use sparse columns to increase the total of columns that a table can have to 30,000. Sparse columns are ordinary columns that have an optimized storage for null values. Sparse columns reduce the space requirements for null values at the cost of more overhead to retrieve nonnull values. A wide table has defined a column set, which is an untyped XML representation that combines all the sparse columns of a table into a structured output. The number of indexes and statistics is also increased to 1,000 and 30,000, respectively. The maximum size of a wide table row is 8,019 bytes. Therefore, most of the data in any particular row should be NULL. The maximum number of nonsparse columns plus computed columns in a wide table remains 1,024.

Answer 3

SQL offers a variety of table types, each designed for distinct purposes and having unique traits.

Main tables:Persistent base tables are the predominant type and are employed to permanently store data in databases. Data that must be remembered for multiple sessions is stored and retrieved using it.

Global Temporary Tables, which use the double hash symbol (##) for creation, are accessible to all users in the same database. As soon as the session with them is over, they are quickly removed.

Temporary tables created with '#' are limited to the current session. By the conclusion of the session, they are automatically taken out.

Derived Tables are generated instantly using the results of a SELECT statement. They frequently serve as a temporary surface in a broader investigation.

Views are tables in a virtual form that lack data storage capabilities. They offer an alternative perspective on the information presented in the initial charts. Opinions play a useful role in combining data from various tables, controlling access to specific information, and streamlining intricate searches.

The database system automatically generates system tables to store information like user profiles, permissions, and definitions of tables and indexes. Typically, users do not directly engage with system tables.