Article Source: Microsoft TechNet
Applies To: SQL Server 2016
If you specified a mapping that’s not valid in the Mappings list of the Column Mappings dialog box, the SQL Server Import and Export Wizard shows the Review Data Type Mapping page. On this page, you can review detailed information about data type conversions that the wizard has to perform to make the source data compatible with the destination. This information includes visual cues to distinguish conversions that are expected to succeed from conversions that might cause errors or truncations. For each conversion, you can decide whether to accept the conversion that the wizard suggests, and you can specify how to handle any errors that occur.
 Tip |
|---|
| You can’t change data type mappings on the Review Data Type Mapping page. However, you can click Back to return to the Select Source Tables and Views page, and then click Edit Mappings to open the Column Mappings dialog box again. In the Column Mappings dialog box you can specify data type mappings that are more likely to succeed. |
For more info about how the wizard maps data types from source columns to destination columns, see How the Wizard maps data types from source to destination.
For more info about the SQL Server Import and Export Wizard and how it works, see SQL Server Import and Export Wizard.
The following screen shot shows the Review Data Type Mapping page of the Wizard after the user has specified an invalid mapping in the Column Mappings dialog box. To take another look at the Column Mappings dialog box, see Column Mappings (SQL Server Import and Export Wizard).
The Review Data Type Mapping page consists of a Table list, a Data type mapping list, and error handling options.
Table list
The upper part of the Review Data Type Mapping page is a Table list that lists the tables to be copied from the source to the destination. To see conversion information about an individual table, select a table in the Table list. The conversion information for the selected table appears in the columns in the Data type mapping grid in the lower part of the page.
The following table describes the columns in the Table list.
| Column | Description |
|---|---|
| Source icon | Indicates the probability of success for the data type conversions:
– A green check mark icon indicates that the wizard expects all data type conversions for this table to succeed. |
| Source | Displays the name of the source table. |
| Destination icon | Indicates whether the destination already exists or will be created by the wizard:
– A table icon indicates that the destination is an existing table. |
| Destination | Displays the name of the destination table. |
Data type mapping list
The lower part of the Review Data Type Mapping page is the Data type mapping list. This grid provides detailed conversion information about the columns in the table that is selected in the Table list.
The following table describes the columns in the Data type mapping list.
| Column | Description |
|---|---|
| Conversion icon | Indicates the probability of success for the data type conversions:
– A green check mark icon indicates that the wizard expects that the data type conversion for this column to succeed. |
| Source Column | Displays the name of the source column. |
| Source Type | Displays the data type of the source column. |
| Destination Column | Displays the name of the destination column. |
| Destination Type | Displays the data type of the destination column. |
| Convert | Specify whether the planned conversion should continue:
– Select the check box to have the wizard continue with the planned conversion. |
| On Error | Specify how the wizard handles errors:
– Use the On Error (global) setting, which you can specify at the bottom of this page. |
| On Truncation | Specify how the wizard handles truncation:
– Use the On Truncation (global) setting, which you can specify at the bottom of this page. |
To view detailed information about the conversion of a particular column of data, double-click any row in the list. The Column Conversion Details dialog box opens and displays more detailed conversion information for the column.
Error handling options
On Error (global)
Specify how the wizard handles errors:
- Fail with an error, and stop the import or export process.
- Ignore the error, and continue the import or export process.
This setting applies to all conversions that have Use Global selected in the On Error column of the Data type mapping list.
On Truncation (global)
Specify how the wizard handles data truncation:
- Fail with an error, and stop the import or export process.
- Ignore the truncation, and continue the import or export process.
This setting applies to all conversions that have Use Global selected in the On Truncation column of the Data type mapping list.
After you review the warnings, specify conversion options, and specify how to handle errors, the Review Data Type Mapping page takes you back to the Column Mappings dialog box. For more info, see Column Mappings (SQL Server Import and Export Wizard).
If you If you double-click the row for an individual column in the Data type mapping list, then the Review Data Type Mapping dialog box opens the Column Conversion Details dialog box. On this page, you can review detailed conversion information for an individual column. For more info, see Column Conversion Details Dialog Box (SQL Server Import and Export Wizard).
Reference:
https://msdn.microsoft.com/en-us/library/bb895363.aspx
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