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    <p>The following is <em>extremely</em> rough but it should get the point across. It normalizes the data and moves towards a semi-object oriented (attribute/value/attribute value) structure. I'll leave it up to you to reinforce referential integrity, but the following is flexible and will return the results you want:</p> <pre><code>CREATE TABLE Person ( PersonID INT PRIMARY KEY IDENTITY(1,1) ,Name NVARCHAR(255) ); GO CREATE TABLE PersonAttribute ( PersonID INT ,CondAttributeID INT ,Value NVARCHAR(255) ); GO CREATE TABLE CondAttribute ( AttributeID INT PRIMARY KEY IDENTITY(1,1) ,Attribute NVARCHAR(255)); GO CREATE TABLE CondTable ( CondTableID INT PRIMARY KEY IDENTITY(1,1) ,CondAttributeID INT ,StartValue MONEY ,EndValue MONEY ); GO CREATE TABLE CalculationValues ( CalculationID INT PRIMARY KEY IDENTITY(1,1) ,CalculationValue INT ); GO CREATE TABLE CondCalculation ( CondTableID INT ,CalculationID INT ); INSERT Person (Name) VALUES ('Joe') ,('Bob') ,('Tom'); INSERT PersonAttribute ( PersonID ,CondAttributeID ,Value ) VALUES (1, 1, '60') ,(1, 2, '6.2') ,(1, 3, '169') ,(2, 1, '15') ,(2, 2, '5.1') ,(2, 3, '100') ,(3, 1, '10') ,(3, 2, '4.5') ,(3, 3, '50'); INSERT CondAttribute (Attribute) VALUES ('Age') ,('height') ,('weight'); INSERT CondTable ( CondAttributeID ,StartValue ,EndValue) VALUES (1,18,999) --Age ,(2,6,99) --Height ,(2,0,5.99) -- Height ,(1,0,17) -- Age ,(3,60,999) -- Weight ,(3,0,59); -- Weight INSERT CalculationValues (CalculationValue) VALUES (5) ,(10) ,(15) ,(20); INSERT CondCalculation (CondTableID, CalculationID) VALUES (1,4) ,(2,4) ,(1,3) ,(3,3) ,(4,2) ,(5,2) ,(5,1) ,(6,1); SELECT * FROM Person AS p JOIN PersonAttribute AS pa ON p.PersonID = pa.PersonID JOIN CondAttribute AS ca ON pa.CondAttributeID = ca.AttributeID JOIN CondTable AS ct ON ca.AttributeID = ct.CondAttributeID AND CONVERT(money,pa.Value) BETWEEN ct.StartValue AND ct.EndValue JOIN CondCalculation AS cc ON cc.CondTableID = ct.CondTableID JOIN CalculationValues AS c ON cc.CalculationID = c.CalculationID WHERE p.PersonID = 1 </code></pre>
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    1. CODoes Age,weight,height goes into condAttribute Table? and Perhaps you mean AttributeID instead of CondAttributeID in table CondTable?
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    2. COLike I said, it was rough. But CondAttributeId and AttributeID are equivalent. The idea is that instead of columns named Age, Height, and Weight, the three values are individually mapped to each person. So PersonID 1 may only have values for Age and Height, while PersonID 2 may only have them for Age and Weight. This is a very simplified version of how medical records databases are structured. It's extremely flexible and allows for an object (in this case a person) to only have values for attributes that there is actually data for.
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