Linked table

Author: r | 2025-04-25

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The new linked table links to the original source table. For example, if you export a linked table named Employees1 in the Sales database that is linked to the Employees table in the Payroll database, the export operation creates a linked table in the destination database. The new linked table links directly to the Employees table in the

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SQL Table linking is it better to have a linking table, or a

History table.CREATE TABLE Department( DepartmentNumber CHAR (10) NOT NULL PRIMARY KEY CLUSTERED, DepartmentName VARCHAR (50) NOT NULL, ManagerID INT NULL, ParentDepartmentNumber CHAR (10) NULL, ValidFrom DATETIME2 GENERATED ALWAYS AS ROW START HIDDEN NOT NULL, ValidTo DATETIME2 GENERATED ALWAYS AS ROW END HIDDEN NOT NULL, PERIOD FOR SYSTEM_TIME (ValidFrom, ValidTo))WITH (SYSTEM_VERSIONING = ON);This example creates a new temporal table linked to an existing history table.-- Existing tableCREATE TABLE Department_History( DepartmentNumber CHAR (10) NOT NULL, DepartmentName VARCHAR (50) NOT NULL, ManagerID INT NULL, ParentDepartmentNumber CHAR (10) NULL, ValidFrom DATETIME2 NOT NULL, ValidTo DATETIME2 NOT NULL);-- Temporal tableCREATE TABLE Department( DepartmentNumber CHAR (10) NOT NULL PRIMARY KEY CLUSTERED, DepartmentName VARCHAR (50) NOT NULL, ManagerID INT NULL, ParentDepartmentNumber CHAR (10) NULL, ValidFrom DATETIME2 GENERATED ALWAYS AS ROW START HIDDEN NOT NULL, ValidTo DATETIME2 GENERATED ALWAYS AS ROW END HIDDEN NOT NULL, PERIOD FOR SYSTEM_TIME (ValidFrom, ValidTo))WITH (SYSTEM_VERSIONING = ON (HISTORY_TABLE=dbo.Department_History, DATA_CONSISTENCY_CHECK=ON));R. Create a system-versioned memory-optimized temporal tableApplies to: SQL Server 2016 (13.x) and later, and Azure SQL Database.The following example shows how to create a system-versioned memory-optimized temporal table linked to a new disk-based history table.This example creates a new temporal table linked to a new history table.CREATE SCHEMA History;GOCREATE TABLE dbo.Department( DepartmentNumber CHAR (10) NOT NULL PRIMARY KEY NONCLUSTERED, DepartmentName VARCHAR (50) NOT NULL, ManagerID INT NULL, ParentDepartmentNumber CHAR (10) NULL, ValidFrom DATETIME2 GENERATED ALWAYS AS ROW START HIDDEN NOT NULL, ValidTo DATETIME2 GENERATED ALWAYS AS ROW END HIDDEN NOT NULL, PERIOD FOR SYSTEM_TIME (ValidFrom, ValidTo))WITH (MEMORY_OPTIMIZED = ON, DURABILITY = SCHEMA_AND_DATA, SYSTEM_VERSIONING = ON (HISTORY_TABLE=History.DepartmentHistory));This example creates a new temporal table linked to an existing history table.-- Existing tableCREATE TABLE Department_History( DepartmentNumber CHAR (10) NOT NULL, DepartmentName VARCHAR (50) NOT NULL, ManagerID INT NULL, ParentDepartmentNumber CHAR (10) NULL, ValidFrom DATETIME2 NOT NULL, ValidTo DATETIME2 NOT NULL);-- Temporal tableCREATE TABLE Department( DepartmentNumber CHAR (10) NOT NULL PRIMARY KEY CLUSTERED, DepartmentName VARCHAR (50) NOT NULL, ManagerID INT NULL, ParentDepartmentNumber CHAR (10) NULL, ValidFrom DATETIME2 GENERATED ALWAYS AS ROW START HIDDEN NOT NULL, ValidTo DATETIME2 GENERATED ALWAYS AS ROW END HIDDEN NOT NULL, PERIOD FOR SYSTEM_TIME (ValidFrom, ValidTo))WITH (SYSTEM_VERSIONING = ON (HISTORY_TABLE=dbo.Department_History, DATA_CONSISTENCY_CHECK=ON));S. Create a The new linked table links to the original source table. For example, if you export a linked table named Employees1 in the Sales database that is linked to the Employees table in the Payroll database, the export operation creates a linked table in the destination database. The new linked table links directly to the Employees table in the This MSAccess tutorial explains how to link to a table in another database in Access 2007 (with screenshots and step-by-step instructions).Question: In Microsoft Access 2007, how can I link to a table in another database?Answer: You are able to link to tables from other databases, whether the table is an Access table, an Oracle table, an Excel spreadsheet, or even a text file.Linking to a table from another Access databaseTo link to a table from another Access database, select the External Data tab in the toolbar at the top of the screen. Then click on the Access button in the Import group.Next, click on the Browse button and find the Access file that contains the tables that you wish to link to. In this example, we are selecting the Testing2.accdb file.Then select the radio button called "Link to the data source by created a creating table" and click on the OK button.Highlight the tables that you wish to link to. In this example, we have selected the Suppliers table.When you have finished selecting the tables, click on the OK button.Your linked tables should now appear in your database window. You will notice the arrow to the left of the table name. That means that it is a linked table.Linking to a table from an Oracle databaseTo link to a table from an Oracle database, select the External Data tab in the toolbar at the top of the screen. Then in the Import group, click on the More button and select ODBC Database from the popup menu.Select the option called "Link to the data source by creating a linked table" and click on the OK button.A "Select Data Source" window should appear. Click on the Machine Data Source tab and select the ODBC connection for your Oracle database. In this example,

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History table.CREATE TABLE Department( DepartmentNumber CHAR (10) NOT NULL PRIMARY KEY CLUSTERED, DepartmentName VARCHAR (50) NOT NULL, ManagerID INT NULL, ParentDepartmentNumber CHAR (10) NULL, ValidFrom DATETIME2 GENERATED ALWAYS AS ROW START HIDDEN NOT NULL, ValidTo DATETIME2 GENERATED ALWAYS AS ROW END HIDDEN NOT NULL, PERIOD FOR SYSTEM_TIME (ValidFrom, ValidTo))WITH (SYSTEM_VERSIONING = ON);This example creates a new temporal table linked to an existing history table.-- Existing tableCREATE TABLE Department_History( DepartmentNumber CHAR (10) NOT NULL, DepartmentName VARCHAR (50) NOT NULL, ManagerID INT NULL, ParentDepartmentNumber CHAR (10) NULL, ValidFrom DATETIME2 NOT NULL, ValidTo DATETIME2 NOT NULL);-- Temporal tableCREATE TABLE Department( DepartmentNumber CHAR (10) NOT NULL PRIMARY KEY CLUSTERED, DepartmentName VARCHAR (50) NOT NULL, ManagerID INT NULL, ParentDepartmentNumber CHAR (10) NULL, ValidFrom DATETIME2 GENERATED ALWAYS AS ROW START HIDDEN NOT NULL, ValidTo DATETIME2 GENERATED ALWAYS AS ROW END HIDDEN NOT NULL, PERIOD FOR SYSTEM_TIME (ValidFrom, ValidTo))WITH (SYSTEM_VERSIONING = ON (HISTORY_TABLE=dbo.Department_History, DATA_CONSISTENCY_CHECK=ON));R. Create a system-versioned memory-optimized temporal tableApplies to: SQL Server 2016 (13.x) and later, and Azure SQL Database.The following example shows how to create a system-versioned memory-optimized temporal table linked to a new disk-based history table.This example creates a new temporal table linked to a new history table.CREATE SCHEMA History;GOCREATE TABLE dbo.Department( DepartmentNumber CHAR (10) NOT NULL PRIMARY KEY NONCLUSTERED, DepartmentName VARCHAR (50) NOT NULL, ManagerID INT NULL, ParentDepartmentNumber CHAR (10) NULL, ValidFrom DATETIME2 GENERATED ALWAYS AS ROW START HIDDEN NOT NULL, ValidTo DATETIME2 GENERATED ALWAYS AS ROW END HIDDEN NOT NULL, PERIOD FOR SYSTEM_TIME (ValidFrom, ValidTo))WITH (MEMORY_OPTIMIZED = ON, DURABILITY = SCHEMA_AND_DATA, SYSTEM_VERSIONING = ON (HISTORY_TABLE=History.DepartmentHistory));This example creates a new temporal table linked to an existing history table.-- Existing tableCREATE TABLE Department_History( DepartmentNumber CHAR (10) NOT NULL, DepartmentName VARCHAR (50) NOT NULL, ManagerID INT NULL, ParentDepartmentNumber CHAR (10) NULL, ValidFrom DATETIME2 NOT NULL, ValidTo DATETIME2 NOT NULL);-- Temporal tableCREATE TABLE Department( DepartmentNumber CHAR (10) NOT NULL PRIMARY KEY CLUSTERED, DepartmentName VARCHAR (50) NOT NULL, ManagerID INT NULL, ParentDepartmentNumber CHAR (10) NULL, ValidFrom DATETIME2 GENERATED ALWAYS AS ROW START HIDDEN NOT NULL, ValidTo DATETIME2 GENERATED ALWAYS AS ROW END HIDDEN NOT NULL, PERIOD FOR SYSTEM_TIME (ValidFrom, ValidTo))WITH (SYSTEM_VERSIONING = ON (HISTORY_TABLE=dbo.Department_History, DATA_CONSISTENCY_CHECK=ON));S. Create a

2025-04-04
User3371

This MSAccess tutorial explains how to link to a table in another database in Access 2007 (with screenshots and step-by-step instructions).Question: In Microsoft Access 2007, how can I link to a table in another database?Answer: You are able to link to tables from other databases, whether the table is an Access table, an Oracle table, an Excel spreadsheet, or even a text file.Linking to a table from another Access databaseTo link to a table from another Access database, select the External Data tab in the toolbar at the top of the screen. Then click on the Access button in the Import group.Next, click on the Browse button and find the Access file that contains the tables that you wish to link to. In this example, we are selecting the Testing2.accdb file.Then select the radio button called "Link to the data source by created a creating table" and click on the OK button.Highlight the tables that you wish to link to. In this example, we have selected the Suppliers table.When you have finished selecting the tables, click on the OK button.Your linked tables should now appear in your database window. You will notice the arrow to the left of the table name. That means that it is a linked table.Linking to a table from an Oracle databaseTo link to a table from an Oracle database, select the External Data tab in the toolbar at the top of the screen. Then in the Import group, click on the More button and select ODBC Database from the popup menu.Select the option called "Link to the data source by creating a linked table" and click on the OK button.A "Select Data Source" window should appear. Click on the Machine Data Source tab and select the ODBC connection for your Oracle database. In this example,

2025-03-28
User1942

TABLE dbo.mylogintable( date_in DATETIME, user_id INT, myuser_name AS USER_NAME());M. Create a table that has a FILESTREAM columnThe following example creates a table that has a FILESTREAM column Photo. If a table has one or more FILESTREAM columns, the table must have one ROWGUIDCOL column.CREATE TABLE dbo.EmployeePhoto( EmployeeId INT NOT NULL PRIMARY KEY, Photo VARBINARY (MAX) FILESTREAM NULL, MyRowGuidColumn UNIQUEIDENTIFIER DEFAULT NEWID() ROWGUIDCOL NOT NULL UNIQUE);N. Create a table that uses row compressionThe following example creates a table that uses row compression.CREATE TABLE dbo.T1( c1 INT, c2 NVARCHAR (200))WITH (DATA_COMPRESSION = ROW);For additional data compression examples, see Data Compression.O. Create a table that uses XML compressionApplies to: SQL Server 2022 (16.x) and later versions, Azure SQL Database, and Azure SQL Managed Instance.The following example creates a table that uses XML compression.CREATE TABLE dbo.T1( c1 INT, c2 XML)WITH (XML_COMPRESSION = ON);P. Create a table that has sparse columns and a column setThe following examples show to how to create a table that has a sparse column, and a table that has two sparse columns and a column set. The examples use the basic syntax. For more complex examples, see Use Sparse Columns and Use Column Sets.This example creates a table that has a sparse column.CREATE TABLE dbo.T1( c1 INT PRIMARY KEY, c2 VARCHAR (50) SPARSE NULL);This example creates a table that has two sparse columns and a column set named CSet.CREATE TABLE T1( c1 INT PRIMARY KEY, c2 VARCHAR (50) SPARSE NULL, c3 INT SPARSE NULL, CSet XML COLUMN_SET FOR ALL_SPARSE_COLUMNS);Q. Create a system-versioned disk-based temporal tableApplies to: SQL Server 2016 (13.x) and later, and Azure SQL Database.The following examples show how to create a temporal table linked to a new history table, and how to create a temporal table linked to an existing history table. The temporal table must have a primary key defined to be enabled for the table to be enabled for system versioning. For examples showing how to add or remove system versioning on an existing table, see System Versioning in Examples. For use cases, see Temporal Tables.This example creates a new temporal table linked to a new

2025-04-25
User6034

Performance. The Start logic is not necessary for a SQL Server based system to get the best level of performance. Limited Report Writer features when using both SQL and C-ISAM data This section provides useful information that you should be aware of when defining and running reports that access data from both SQL Server tables and C-ISAM files in the same report. Limits The following table defines the limits for the Report Writer: Description Limit Maximum ISAM record length 4000 Maximum ISAM key length 200 Maximum alphanumeric field length 255 Maximum numeric field size 15.6- Maximum columns per table 200 Maximum column conditions per report 200 Maximum linked tables per report 12 Maximum 1-Many linked tables per report 2 Maximum columns per report 200 Maximum columns per heading section 100 Maximum columns per group heading section 100 Maximum columns per detail section 100 Maximum columns per sub-total section 100 Maximum columns per total section 100 Maximum number of user variables 100 Maximum number of unique strings per report 100 Maximum number of unique numeric constants per report 100 Maximum report conditions 30 Maximum level of brackets in conditions 10 Maximum columns per sequence 10 Maximum sequences per report 10 Maximum sub-total levels and groups 5 Maximum user variables conditions per variable 3 Maximum lines in the page heading 10 Maximum number of run-time prompts per report 10 Maximum fields per user variable 12 Limitations when using a mixture of ISAM and SQL tables in the same report If you intend to use a combination of ISAM and SQL tables in the same report, you must ensure that the primary table and any 1-Many linked tables are SQL Server-based. You can include 1-1 linked ISAM tables in the report. The Primary table cannot be an ISAM table if you are using mixed SQL and ISAM tables. Permissions (table and column) Each table and column can be assigned one of the following permissions: None - No Access Read Read/Write The default should normally be set to Read only. You use the Browse on Data Dictionary Tables Data Dictionary Tables program to define table access. You use the Browse on Data Dictionary Columns Data Dictionary Columns program to define table access. The lower access setting of the table and column permission is used to determine the actual access allowed. This is shown in the table below: Table Access Column Access Actual Column Access

2025-04-15

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