How Can I View Table Variable Values While Debugging T-SQL Code?

Viewing Table Variable Values During T-SQL Debug Mode

When debugging T-SQL queries, examining the contents of table variables can provide valuable insights into their behavior. In SQL Server Management Studio (SSMS), there is a simple technique to visualize the rows and cells of a table variable during debug time.

Solution:

To view the values of a table variable at debug time:

1. Insert the following statement at the desired breakpoint:

DECLARE @v XML = (SELECT * FROM <tablename> FOR XML AUTO)

Replace with the name of your table variable.

2. The table's contents will be rendered in XML format in the Locals window when you enter this statement.
3. Alternatively, you can add @v to the Watches window by right-clicking on it and selecting "Add Watch".

Example:

Consider this code that creates a table variable and populates it with data:

DECLARE @table Variable TABLE
(
  ID INT,
  Name VARCHAR(50)
)

INSERT INTO @table (ID, Name)
VALUES
(1, 'John Doe'),
(2, 'Jane Smith')

To view the contents of @table:

1. Set a breakpoint at the line VALUES (1, 'John Doe'), (2, 'Jane Smith').
2. Insert the statement DECLARE @v XML = (SELECT * FROM @table FOR XML AUTO).
3. Resume debugging and observe the Locals window. You will see the following XML output, representing the rows and cells of @table:

<DEPT>
  <ID>1</ID>
  <Name>John Doe</Name>
</DEPT>
<DEPT>
  <ID>2</ID>
  <Name>Jane Smith</Name>
</DEPT>

By leveraging this technique, you can inspect the contents of your table variables, ensuring accurate data handling and avoiding errors.

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