SQL QUERY

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Trinadh

SQL QUERY
1 Answer(s) a year and 10 months ago
Posted in : SQL

am a having a table 'PROGRAMMER' with columns PNAME,LANGUAGE1,LANGUAGE2... as shown below

pname Language1 Language2 Trinadh C pascal Bhanu Sql DBASE Sudheer Cobol Pascal Gopi Pascal Sql Mahesh DBASE Cobol Gopal oracle C

Now i need to write a query "which language is known by only one programmer"

Plz any one help meeeeeeeeeeeeeee

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August 4, 2011 at 5:19 PM

Hi try this sql query,

SELECT LANGUAGE1 from (SELECT LANGUAGE1 FROM programmer where prof1 not in (SELECT LANGUAGE2 FROM programmer)) group by LANGUAGE1 having count(LANGUAGE1) = 1 UNION SELECT LANGUAGE2 from (SELECT LANGUAGE2 FROM programmer where prof2 not in (SELECT LANGUAGE1 FROM programmer)) GROUP BY LANGUAGE2 HAVING COUNT(LANGUAGE2) = 1

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