# Source: https://dbeaver.com/docs/dbeaver/Data-compare/

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  * Data transfer and schema compare  Data transfer and schema compare 
    * Data transfer  Data transfer 
      * [ Data transfer  ](../Data-transfer/)
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    * Data compare  [ Data compare  ](./) Table of contents 
      * Steps for comparing data 
        * Choose a comparison type 
        * Keys configuration 
          * Composite keys 
        * Column mapping 
        * Compare settings 
        * Execution log 
      * Viewing the results 
        * Additional tools 
    * [ Backup and restore  ](../Backup-Restore/)
    * Schema compare  Schema compare 
      * [ Schema compare  ](../Schema-compare/)
      * [ Liquibase support  ](../Using-Liquibase-in-DBeaver/)
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  * About DBeaver  About DBeaver 
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      * [ Lite edition  ](../Lite-Edition/)
      * [ Ultimate edition  ](../Ultimate-Edition/)
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    * [ Customer technical support  ](../Customer-technical-support-information/)
  * [ FAQ  ](../FAQ/)

Table of contents

  * Steps for comparing data 
    * Choose a comparison type 
    * Keys configuration 
      * Composite keys 
    * Column mapping 
    * Compare settings 
    * Execution log 
  * Viewing the results 
    * Additional tools 

  1. [DBeaver](/docs/dbeaver)
  2. Data transfer and schema compare

# Data compare

Note

This feature is available in [Enterprise](../Enterprise-Edition/),
[Ultimate](../Ultimate-Edition/) and [Team](https://dbeaver.com/docs/team-
edition/) editions only.

DBeaver provides functionality to compare two tables or query results, which
is useful when you need to identify minor differences in datasets that appear
almost identical. This capability is essential for tasks such as:

  * quickly visualizing and navigating differences
  * exporting data that differs between sources

## Steps for comparing data¶

First, select the tables you wish to compare from the [Database
Navigator](../Database-Navigator/).

Tip

You can start the compare through AI by sending a short request in AI chat.
See [Data transfer actions](../Data-Transfer-Actions/) for supported commands.

![](../images/ug/tools/data-compare/select-tables-from-Database-Navigator.png)

### Choose a comparison type¶

Select what you will compare by choosing the appropriate tab in the **Source**
/ **Target** windows.

  * **Tables** : compare two tables

![](../images/ug/tools/data-compare/choose-tables.png)

  * **Table to Query** : compare a table with the result of an SQL query

![](../images/ug/tools/data-compare/choose-query-and-table.png)

  * **Queries** : compare the results of two SQL queries When comparing the results of two SQL queries, you have two methods to perform this operation:

  * **Use Source/Target Query tabs**

Select the **Query** tab in both the **Source** and **Target** windows. Enter
your SQL queries directly into these fields to set up the comparison.

  * **Use SQL Editor**

Alternatively, write your SQL queries in the [SQL Editor](../SQL-Editor/).
Highlight the queries and choose **Execute - > Data Compare from query**.

Tip

You can compare objects from the same or different databases, or even between
different Relational Database Management Systems (RDBMS), such as PostgreSQL
and MySQL.

### Keys configuration¶

Select one or more columns that will serve as the **unique key** for the
comparison. Choosing the wrong **keys** may result in invalid comparison
results.

![](../images/ug/tools/data-compare/keys-configuration.png)

Note

By default, if the table has a unique key, it will be selected automatically
during the initial setup. If the table doesnât have a primary key, you can
manually select one or more columns to define a unique key.

#### Composite keys¶

When you select multiple columns, they form a **composite key**. Composite
keys uniquely identify rows based on a combination of values across the
selected columns.

Tip

Select columns for composite keys that, together, uniquely identify each row.
Avoid columns with duplicate or null values, as they may impact comparison
accuracy.

### Column mapping¶

If the objects you are comparing have different ordering, naming, or
quantities of columns, you can adjust their mappings or skip columns that are
not of interest.

You can use the **Auto assign** button to automatically link columns with the
same names.

![](../images/ug/tools/data-compare/column-mapping.png)

Note

This page will only feature columns that are not used as the primary key
configured on the previous page.

### Compare settings¶

On the final page of the **Data Compare** wizard, configure settings to tailor
the data comparison to your needs:

![](../images/ug/tools/data-compare/compare-settings.png)

Setting | Description  
---|---  
**Open viewer on finish** | Opens the compare viewer for a visual overview of the differences once the comparison is complete.  
**Export compare results to file** | Exports the SQL script diff to a file. You can choose the output format and specify the output file path.  
**Apply changes to** | Chooses which table the exported script updates. Pick **Source table** or **Target table** to define where the `diff` is applied.  
**Output order** | Controls how changes are sorted in the exported result. **Default** keeps the comparison order. **By type** groups inserts, updates, then deletes.  
**Output format** | Chooses how the results are written to the file. You can export an **SQL script** or an **HTML table**.  
**Output file** | Sets the path and file name where DBeaver will save the exported diff.  
**Limit compared rows to** | Limits how many rows must be compared against each other before ending the comparison.  
**Limit different rows to** | Limits how many rows must be differ between each other before ending the comparison.  
**Limit fetch size to** | Determines how many rows should be fetched at once, which helps manage memory and performance during comparison.  
**Show modified rows** | Determines whether modified rows should be included in the diff or not, allowing you to track changes in the data.  
**Show deleted rows** | Determines whether deleted rows should be included in the diff or not, providing insight into data that has been removed from the database.  
**Show inserted rows** | Determines whether newly inserted rows should be included in the diff or not, allowing you to see additions to the database.  
**Store results in memory** | Stores results in memory for further processing. Note that DBeaver might run out of memory when comparing large tables if this option is enabled. When disabled, results will be stored in a temporary database.  
**Open new connections** | Opens new physical connections for data reading, which can help manage resources and ensure the stability of data comparison operations.  
**Query rows count** | Queries row count before performing compare. This lets you track the progress of the comparison but may cause performance faults in some cases.  
**Save task** | Opens the [**Save Task window**](../Task-Management/) to assist in creating a task during the compare process. This window provides options and settings for creating and configuring a task related to the compare operation.  
  
Tip

You can export file to a remote file system via [Cloud Storage](../Cloud-
Storage/) using the **Browser remote file system** button
![](../images/dt/Browser-remote-file-system-button.png).

### Execution log¶

Once you have configured all settings and clicked **Proceed** , the Data
Compare wizard will perform the comparison operation:

  * an **Execution Log** window will display the progress and outcome of the comparison process.
  * simultaneously, a separate window will open showing the comparison results. This window provides a detailed view of differences between the datasets based on the specified settings

![](../images/ug/tools/data-compare/execution-log.png)

## Viewing the results¶

After the comparison process is complete, you can view the results in the
viewer. It highlights the differences between the datasets in detail, with
each row that shows a discrepancy being clearly marked.

![](../images/ug/tools/data-compare/data-compare-viewer.png)

Note

A complete visual preview of the results is available only when **Data
Compare** is launched through the wizard. If launched as part of a task, the
visual editor will not open. Instead, only statistics will be recorded in the
[execution log](../Task-Scheduler/#monitoring-task-execution).

### Additional tools¶

The viewer not only displays the differences but also provides tools to manage
and interpret these differences effectively. Here's what you can do within the
compare viewer:

Feature | Button image | Description  
---|---|---  
**Export changes** | ![](../images/ug/tools/data-compare/export-changes-button.png) | The results of the **Data Compare** can be exported as an SQL script, which includes `DELETE`, `INSERT`, and `UPDATE` statements to make the data in the second table match the first. Alternatively, you can export the results in an `HTML` format as a table for easy viewing and sharing.  
**Swap tables** | ![](../images/ug/tools/data-compare/swap-tables-button.png) | The **Swap tables** button allows you to switch the positions of the source and target data panels within the viewer.  
**Show summary** | ![](../images/ug/tools/data-compare/show-summary-button.png) | By clicking the **Show Summary** button, you can access a statistical summary and analysis of the differences found between the datasets. This summary provides a quick overview of the total changes, including the number of modified, deleted, and inserted rows.  
  
Tip

You can also export the comparison results table through [Export
data](../Data-transfer/) button ![](../images/ug/tools/data-compare/export-
data-button.png) in the bottom toolbar or [copy](../Data-Viewing-and-
Editing/#copying-and-pasting-cells) rows or individual values that differ.

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