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POsql query to return differences between two tables
 

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    <p>I am trying to compare two tables, SQL Server, to verify some data. I want to return all the rows from both tables where data is either in one or the other. In essence, I want to show all the discrepancies. I need to check three pieces of data in doing so, FirstName, LastName and Product.</p> <p>I'm fairly new to SQL and it seems like a lot of the solutions I'm finding are over complicating things. I don't have to worry about NULLs.</p> <p>I started by trying something like this:</p> <pre><code>SELECT DISTINCT [First Name], [Last Name], [Product Name] FROM [Temp Test Data] WHERE ([First Name] NOT IN (SELECT [First Name] FROM [Real Data])) </code></pre> <p>I'm having trouble taking this further though.</p> <p>Thanks!</p> <p>EDIT:</p> <p>Based on the answer by @treaschf I have been trying to use a variation of the following query:</p> <pre><code>SELECT td.[First Name], td.[Last Name], td.[Product Name] FROM [Temp Test Data] td FULL OUTER JOIN [Data] AS d ON td.[First Name] = d.[First Name] AND td.[Last Name] = d.[Last Name] WHERE (d.[First Name] = NULL) AND (d.[Last Name] = NULL) </code></pre> <p>But I keep getting 0 results back, when I know that there is at least 1 row in td that is not in d.</p> <p>EDIT:</p> <p>Ok, I think I figured it out. At least in my few minutes of testing it seems to work good enough.</p> <pre><code>SELECT [First Name], [Last Name] FROM [Temp Test Data] AS td WHERE (NOT EXISTS (SELECT [First Name], [Last Name] FROM [Data] AS d WHERE ([First Name] = td.[First Name]) OR ([Last Name] = td.[Last Name]))) </code></pre> <p>This is basically going to tell me what is in my test data that is <em>not</em> in my real data. Which is completely fine for what I need to do.</p>
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