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    <p>Although not conclusive, based on the following tests it looks like SharePoint handles numbers in a way suitable for monetary calculations (at least with WSS 3.0/SQL Server 2005) even though they are stored approximately. However, <strong>values with over 15 significant figures can exhibit rounding errors</strong>:</p> <p><strong>Test for money storage and retrieval</strong></p> <p>Three number columns (<code>First</code>, <code>Second</code> and <code>Third</code>) containing 3.7, 3.65 and 0.05 respectively (.Net example from <a href="https://stackoverflow.com/questions/316727/is-a-double-really-unsuitable-for-money/316731#316731">here</a>) and a calculated column (returning a single line of text) with the following formula: <code>=IF(First=Second+Third,"Success","Failure")</code>. On viewing the list the calculated column displays <strong>Success</strong>.</p> <p><strong>Test for money calculations</strong></p> <p>A Yes/No calculated column with the formula <code>=0.1+0.1+0.1=0.3</code> (.Net example from <a href="https://stackoverflow.com/questions/316727/is-a-double-really-unsuitable-for-money/316737#316737">here</a>). On viewing the list the calculated column displays <strong>Yes</strong>.</p> <p><strong>Test for money storage and calculation I</strong></p> <p>In a list called <code>TestList</code>, a custom number column (<code>CustomNumber</code>) contains 304253.3251 (SQL Server example from <a href="http://www.microsoft.com/downloads/details.aspx?familyid=bae8beec-9892-4ecd-a9db-292254895f9c&amp;displaylang=en" rel="nofollow noreferrer">Microsoft White Paper</a>). This is stored in database table <code>AllUserData</code>, column <code>float1</code> of type <code>float</code> (SQL Server 2005). <code>float</code> is an approximate data type.</p> <p>Running the following queries:</p> <pre><code>DECLARE @ListName UNIQUEIDENTIFIER SET @ListName = (SELECT tp_Id FROM AllLists WHERE tp_Title = 'TestList') SELECT CAST(float1 as NUMERIC(18, 11)) AS CustomNumber FROM AllUserData WHERE tp_ListId = @ListName SELECT float1 AS CustomNumber FROM AllUserData WHERE tp_ListId = @ListName </code></pre> <p>Gives the following results:</p> <pre><code>CustomNumber 304253.32510000002 CustomNumber 304253.3251 </code></pre> <p>Creating a calculated column with the formula <code>=CustomNumber*100000000000</code> which might be expected to display the incorrect value of <code>30425332510000002</code> actually <strong>displays the correct (from the user's perspective) value of <code>30,425,332,510,000,000.00000</code></strong>. I assume that this behaviour is due to the code reading the <code>float</code> value from the database doing a cast to <code>numeric</code> with a suitably small number of decimal places and manipulating the values in memory using the .Net Decimal type.</p> <p>There are <a href="http://www.sqlservercentral.com/Forums/Topic544518-9-2.aspx" rel="nofollow noreferrer">suggestions</a>, however, that on SQL Server 2000 calculation errors may manifest in this case since the behaviour of <code>float</code> values has been altered between the versions.</p> <p><strong>Test for money storage and retrieval II</strong></p> <p>Based on the results from the previous test add the following value to the <code>CustomNumber</code> column: 9999999999999999.</p> <p>This 16 significant digit value is <strong>displayed incorrectly in the list (and edit) views as 10,000,000,000,000,000</strong> (using a value with 15 digits displays correctly).</p> <p>Inspecting the <code>AllUserData</code> table shows that the value is stored incorrectly in the database and running the following query:</p> <pre><code>DECLARE @f FLOAT SET @f = 9999999999999999 SELECT CAST(@f as NUMERIC(20, 0)) </code></pre> <p>Gives the result:</p> <pre><code>10000000000000000 </code></pre> <p>Which demonstrates that SQL Server is rounding the number on insertion.</p>
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