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    <p>You could add the following check constraint:</p> <p><strike><code>CHECK LEN(col) = LEN(REPLACE(col, ' ', ''));</code></strike></p> <p>...or...</p> <pre><code>CHECK (col NOT LIKE '% %'); </code></pre> <p>...or...</p> <pre><code>CHECK (CHARINDEX(' ', col) = 0) </code></pre> <p>Example:</p> <pre><code>USE tempdb; GO CREATE TABLE dbo.bar(foo NVARCHAR(50) PRIMARY KEY); ALTER TABLE dbo.bar ADD CONSTRAINT chkNoSpaces CHECK (foo NOT LIKE '% %'); </code></pre> <p>Succeeds:</p> <pre><code>INSERT dbo.bar(foo) SELECT 'AAAA'; GO </code></pre> <p>Fails:</p> <pre><code>INSERT dbo.bar(foo) SELECT 'AA AA'; GO </code></pre> <p>Results:</p> <blockquote> <p>Msg 547, Level 16, State 0, Line 1 <br>The INSERT statement conflicted with the CHECK constraint "chkNoSpaces". The conflict occurred in database "tempdb", table "dbo.bar", column 'foo'. <br>The statement has been terminated.</p> </blockquote> <p>Clean up:</p> <pre><code>DROP TABLE dbo.bar; </code></pre> <p><strong>EDIT</strong></p> <p>If you need to do this through the UI for some reason (again I recommend you do this with a script that you can make atomic, repeatable, save to a file, store in source control, etc):</p> <ol> <li>In Object Explorer, right-click your table and select <kbd>Design</kbd></li> <li>Right-click your column in the upper grid and select <kbd>Check Constraints...</kbd></li> <li>Click <kbd>Add</kbd></li> <li>Type <code>column_name NOT LIKE '% %'</code> in the "Expression" box (use your actual column name, not <code>column_name</code>)</li> <li>If you think you already have data that violates the constraint, change the option for "Check Existing Data..." to <kbd>No</kbd> (and promptly go fix that data)</li> <li>Click <kbd>Close</kbd></li> <li>Click on the "Save" icon on the toolbar</li> </ol> <p>Note that the UI actually changes the construction of the clause, e.g. <code>(NOT col_name LIKE '% %')</code></p>
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    1. POHow do I make sure a string column has no spaces?
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    1. USAaron Bertrand
    1. USAaron Bertrand
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    1. POHow do I make sure a string column has no spaces?
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    1. COIs there anyway to do this in Managment Studio?
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    2. COYes but it's convoluted to walk through all of the UI dialogs. It's also something you can't save in a script or source control. Why do you need to use Management Studio to do this?
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    3. COWhy not?: CHECK CHARINDEX(N' ',col) = 0 I like the trick of comparing these lengths to count occurrences, but it seems like the CHARINDEX should only have to scan the string once (at most) and the REPLACE and two LENs seem more expensive without knowing the internals.
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