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reate table and insert data into Teradata database from MS SQL Server

reate table and insert data into Teradata database from MS SQL Server

reate table and insert data into Teradata database from MS SQL Server

(OP)
Hi,

I noticed that I can't do sub queries in Teradata.   

For example:
Select  patient_name
Patient_age,
Patient_weight,
(Select Count(*) from drug_taken WHERE drug_name="Warfarin" patient_id=10)  CountWarfarin,
(Select Count(*) from drug_taken WHERE drug_name="Heprin" patient_id=10)  CountHeprin
FROM patient
WHERE patient_id=10

So what is the workaround for this? Where I don't have to create a stored procedure.

Thank you,
-Tesh
 

RE: reate table and insert data into Teradata database from MS SQL Server

Why don't you use JOIN clause.
This is Teradata, not O**e or My***. JOIN is efficient !

CODE

SELECT  ptn.patient_name
    ,   ptn.Patient_age
    ,   ptn.Patient_weight
    ,   SUM(CASE WHEN drug_name = "Warfarin" THEN 1 ELSE 0 END)  AS CountWarfarin
    ,   SUM(CASE WHEN drug_name = "Heprin" THEN 1 ELSE 0 END)  AS CountHeprin
FROM    patient     AS ptn
    LEFT JOIN
        drug_taken  AS drg
        ON  ptn.patient_id = drg.patient_id
        AND drg.drug_name IN ("Heprin", "Warfarin")
WHERE   ptn.patient_id = 10
;

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