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    <p>Certainly <strong>NOT</strong>:</p> <ul> <li><p><code>TEXT, NTEXT</code>: those types are <strong>deprecated</strong> as of SQL Server 2005 and should not be used for new development. Use <code>VARCHAR(MAX)</code> or <code>NVARCHAR(MAX)</code> instead</p></li> <li><p><code>IMAGE</code>, <code>VARBINARY(MAX)</code> : <code>IMAGE</code> is deprecated just like <code>TEXT/NTEXT</code>, and there's really no point in storing a text string into a binary column....</p></li> </ul> <p>So that basically leaves <code>VARCHAR(x)</code> or <code>NVARCHAR(x)</code>: <code>VARCHAR</code> stores non-Unicode strings (1 byte per character) and <code>NVARCHAR</code> stores everything in a 2-byte-per-character Unicode mode. So do you need Unicode? Do you have Arabic, Hebrew, Chinese or other non-Western-European characters in your strings, potentially? Then go with <code>NVARCHAR</code></p> <p>The <code>(N)VARCHAR</code> columns come in two flavors: either you define a maximum length that results in 8000 bytes or less (<code>VARCHAR</code> up to 8000 characters, <code>NVARCHAR</code> up to 4000), or if that's not enough, use the <code>(N)VARCHAR(MAX)</code> versions, which store up to 2 GByte of data.</p> <p><strong>Update:</strong> SQL Server <strong>2016</strong> will have native JSON support - a new <code>JSON</code> datatype (which is based on <code>nvarchar</code>) will be introduced, as well as a <code>FOR JSON</code> command to convert output from a query into JSON format</p> <p><strong>Update #2:</strong> in the final product, Microsoft did not include a separate <code>JSON</code> datatype - instead, there are a number of JSON-functions (to package up database rows into JSON, or to parse JSON into relational data) which operate on columns of type <code>NVARCHAR(n)</code></p>
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