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POCTE-common table exp in t-sql
 

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    <p>I have a problem with the following query:</p> <pre><code>WITH CTE_1 (stu_id ,meet_doc_id ,doc_name ,stu_name ,dob ,done ,date_meet_doc) AS (SELECT stu_id ,meet_doc_id ,doc_name ,stu_name ,dob ,CASE WHEN (PATINDEX('%SMOKING%',act.VALUE)) THEN 'LMDO' WHEN (PATINDEX('%NOT SMOKING%',act.VALUE)) THEN 'LMD1' WHEN (ISNULL(CAST(act.VALUE as varchar(max)),'')='') THEN 'CLEAR' ELSE 'CLEAR' END done ,date_meet_doc FROM abc INNER JOIN INNER JOIN INNER JOIN WHERE multiple conditions ) SELECT * FROM CTE_1 one WHERE date =(SELECT MAX(DATE) FROM CTE_1 two WHERE two.stu_id=one.stu_id AND one.doc_name=two.doc_name) ORDER BY stu_name,dob ; </code></pre> <p>The result set of the inner query(CTE_1) for three student(for eg) will be something like</p> <pre><code>stu_id meet_doc_id doc_name stu_name dob value date 101 0104 AD AM 15/06/1950 LMDO 2011-02-15 101 0105 AD AM 15/06/1950 CLEAR 2011-02-18 101 0106 AD AM 15/06/1950 CLEAR 2011-02-25 102 0107 AD AK 12/08/1987 CLEAR 2011-03-28 102 0108 AD AK 12/08/1987 LDMO 2011-04-29 103 0109 PK LMP 13/07/1970 CLEAR 2011-03-28 103 0110 PK LMP 13/07/1970 CLEAR 2011-05-12 </code></pre> <p>AND when i execute the whole query my result set will be </p> <pre><code>stu_id meet_doc_id doc_name stu_name dob value date 101 0106 AD AM 15/06/1950 CLEAR 2011-02-25 102 0108 AD AK 12/19/1987 LDMO 2011-04-29 103 0110 PK LMP 13/07/1970 CLEAR 2011-05-12 </code></pre> <p><strong>What do i have to do to change the outer query to select only those value ie LDMO or LMD1 for a particular student and whose doctor is same?</strong> </p> <p>Suppose if the student meets the doc multiple times and if in any of the cases if the student gets a LMDO or LMD1 then it should pick only that record irrespective of the date. </p> <p>I am expecting my resultset to be something like:</p> <pre><code>stu_id meet_doc_id doc_name stu_name dob value date 101 0104 AD AM 15/06/1950 LMDO 2011-02-15 102 0107 AD AK 12/08/1987 CLEAR 2011-03-28 103 0110 PK LMP 13/07/1970 CLEAR 2011-05-12 </code></pre> <p>The logic behind it is if the stu_id is same and the doc_name is same and if there exists a value either LMDO or LMD1 then show that record if not show the record which has CLEAR. Simply i want to remove the MAX(date) and place a condition for the whole reporting period of that particular stu_id with the same doc_name.</p>
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