How to select all tables in Database SQL Server?

Introduction

In SQL Server, selecting all tables in a database can be a useful operation for several reasons. It can help to gather a comprehensive view of the database structure, identify orphaned tables, and perform maintenance tasks such as adding or dropping tables. In this article, we will provide a step-by-step guide on how to select all tables in a SQL Server database.

Why Select All Tables?

Selecting all tables can be beneficial in several scenarios:

• Database Structure: Identifying orphaned tables can help you understand the database structure and identify potential maintenance tasks.
• Data Integrity: Selecting all tables can help you ensure that all tables in the database are properly maintained, such as adding or dropping tables.
• Data Quality: Selecting all tables can help you identify tables with missing or incorrect data.

Method 1: Using the sysTables System View

The sysTables system view is a built-in system view in SQL Server that provides information about all tables in the database. Here’s how to use it:

• Query the sysTables system view using the following syntax:

  SELECT * FROM sysTables (name = 'tables')

• This will return a list of all tables in the database, along with their names, types, and attributes.

Example Output

The sysTables system view returns the following output:

+---------+----------+---------------+------------+

| name   | type     | object_id   | system_id |

+---------+----------+---------------+------------+

| dbo..t1  | MSSQLRFD | 1252        | 100         |

| dbo..t2  | MSSQLRFD | 1253        | 100         |

| dbo..t3  | MSSQLRFD | 1254        | 100         |

| dbo..t4  | MSSQLRFD | 1255        | 100         |

| dbo..t5  | MSSQLRFD | 1256        | 100         |

| system..t6  | MTU          | 2500        | 100         |

| system..t7  | MTU          | 2501        | 100         |

| system..t8  | MTU          | 2502        | 100         |

+---------+----------+---------------+------------+

Method 2: Using the INFORMATION_SCHEMA.TABLES Table

The INFORMATION_SCHEMA.TABLES table provides information about all tables in the database, including their names, types, and attributes. Here’s how to use it:

• Query the INFORMATION_SCHEMA.TABLES table using the following syntax:

  SELECT * FROM INFORMATION_SCHEMA.TABLES

• This will return a list of all tables in the database, along with their names, types, and attributes.

Example Output

The INFORMATION_SCHEMA.TABLES table returns the following output:

+------------+-----------+----------+---------------+

| TABLENAME  | TABLEType | TABLEPAD | SUBPARTITION | IS spatial |

+------------+-----------+----------+---------------+------------+

| t1         | NORMAL    | 1        | 1             | 0          |

| t2         | NORMAL    | 1        | 1             | 0          |

| t3         | NORMAL    | 1        | 1             | 0          |

| t4         | NORMAL    | 1        | 1             | 0          |

| t5         | NORMAL    | 1        | 1             | 0          |

| t6         | FORCE      | 1        | 1             | 0          |

| t7         | FORCE      | 1        | 1             | 0          |

| t8         | FORCE      | 1        | 1             | 0          |

+------------+-----------+----------+---------------+------------+

Conclusion

Selecting all tables in SQL Server can be a useful operation for several reasons. By using the sysTables system view or the INFORMATION_SCHEMA.TABLES table, you can gather a comprehensive view of the database structure and identify potential maintenance tasks. Remember to use the sysTables system view with caution, as it can return large amounts of data.

Additional Tips and Best Practices

• *Use a query syntax like `SELECT FROM sysTables (name = ‘tables’)`** to avoid running queries on an infinite recursion.
• Use the OBJECT_ID column to identify tables instead of TABLE_ID.
• Use the SUBPARTITION column to identify tables that are part of a partition.
• Use the IS SPACIAL column to identify tables that are part of a spatial database.
• Use the SECURITY成绩 column to identify tables that have sensitive information.
• Use the CHECKsum column to identify tables that have a stored checksum.