Microsoft Sql Server Compare Two Tables In Database
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Ways to compare and find differences for SQL Server tables and data. Problem. Sometimes we need to compare tables and/or data to know what was changed. This tip shows you different ways to compare data, datatypes and tables. Let's say that we have two similar tables in different databases and we want to know what is different: The T- SQL code generates 2 tables in different databases. How To Install Portable Air Conditioner Casement Window. The table names are the same, but the table in database dbtest. Let's look at ways we can compare these tables using different methods.
Compare Tables Using a LEFT JOINWith the left join we can compare values of specific columns that are not common between two tables. For example: select *.
The left join shows all rows from the left table . This method works to verify new rows, but if we update other columns, the left join does not help. Is there another method to compare tables? It is used to compare the differences between two tables. For example, let's see the differences between the two tables: Now let's run a query using except: select * from dbtest.
I am a database tester and one of my tasks involves getting the row counts from all the tables in the source database and comparing it against the corresponding table.
The except returns the difference between the tables from dbtest. If we flip the tables around in the query we won't see any records, because the table in database dbtest. This method is better than the first one, because if we change values for other columns like the type and cost, the except will notice the difference. Here is an example if we update id . Is there a way to compare tables and synchronize results? Compare Tables Using the Tablediff Tool.
There is a nice command line tool used to compare tables. This command line tool is used to compare tables. It also generates a script with the insert, update and delete statements to synchronize the tables.
For more details, refer to this tablediff article. Compare Changes in a Table Using the Change Data Capture CDCThis feature was added in SQL Server 2.
You need to enable this feature and you also need to have SQL Server Agent running. Basically it creates system tables that track the changes in your tables that you want to monitor. It does not compare tables, but it tracks the changes in tables. For more information, refer to this article: Using Change Data Capture (CDC) in SQL Server 2. Compare Data Types Between Two Tables. What happen if we want to compare the data types?
Is there a way to compare the datatypes? Yes, we can use the . We are going to create a new table named dbo. USE dbtest. 01. CREATE TABLE . All the information of the columns can be obtained from the . We are comparing the table .
To illustrate this we are going to create a table named . The different columns are extra. This is the result of the query: Compare Tables in Different Databases.
Now let's compare the tables in database dbtest. The following query will show the different tables in dbtest. You can use Visual Studio or use other SQL Server Comparison tools. Next Steps. Last Update: 2. About the author. Daniel Calbimonte is a Microsoft SQL Server MVP, Microsoft Certified Trainer and Microsoft Certified IT Professional.