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POUpdate a field with a cascaded string, depending on other fields
 

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    <p>I have the following SQL query (simplified):</p> <pre><code>UPDATE myTable SET Phone1 = 049 ,Phone2 = 123 ,Class = --??? WHERE Project = 'ABC' </code></pre> <p>So I just want to set some default values for every project 'ABC'. For the Class field I want the following: There are 5 other fields in the table, Class1 to Class5, each field contains a 1 or a 0. If Class1 is 1, then Class should contain "C1". If Class1 and Class3 contain a 1, then Class should be "C1 + C3". If all ClassN fields contain a 1 it should be "C1 + C2 + C3 + C4 + C5" and so on.</p> <p>Now that's not too hard either:</p> <pre><code>DECLARE @Class NVARCHAR(100) DECLARE @Class1 INT = 0 DECLARE @Class2 INT = 0 DECLARE @Class3 INT = 0 DECLARE @Class4 INT = 0 DECLARE @Class5 INT = 0 SET @Class = CASE WHEN ISNULL(@Class1, 0) = 1 THEN 'C1 + ' ELSE '' END SET @Class = ISNULL(@Class, '') + CASE WHEN ISNULL(@Class2, 0) = 1 THEN 'C2 + ' ELSE '' END SET @Class = ISNULL(@Class, '') + CASE WHEN ISNULL(@Class3, 0) = 1 THEN 'C3 + ' ELSE '' END SET @Class = ISNULL(@Class, '') + CASE WHEN ISNULL(@Class4, 0) = 1 THEN 'C4 + ' ELSE '' END SET @Class = ISNULL(@Class, '') + CASE WHEN ISNULL(@Class5, 0) = 1 THEN 'C5 + ' ELSE '' END -- Remove last + IF (LEN(@Class) &gt; 0) SET @Class = LEFT(ISNULL(@Class, ''), LEN(@Class) - 2) SELECT @Class </code></pre> <p>But now I am just not sure how to combine those two things the best way. How can I combine them the best way?</p> <p>My best idea right now is to create a scalar-valued function and return the string.</p>
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