Which Language is known by only one programmer? and their names. If possible all details

Question

This is my table structure
PNAME DOB DOJ GENDER PROF1 PROF2 SALARY
ANAND 12-APR-66 21-APR-92 M PASCAL BASIC 3200
ALTAF 02-JUL-64 13-NOV-90 M CLIPPER COBOL 2800
JULIANA 31-JAN-60 21-APR-90 F COBOL DBASE 3000
KAMALA 30-OCT-68 02-JAN-92 F C DBASE 2900
MARY 24-JUN-70 01-FEB-91 F CPP ORACLE 4500
NELSON 11-SEP-65 11-OCT-89 M COBOL DBASE 2500
PATTRICK10-NOV-65 21-APR-90 M PASCAL CLIPPER 2800
QADIR 31-AUG-65 21-APR-91 M ASSEMBLY C 3000
RAMESH 03-MAY-67 28-FEB-91 M PASCAL DBASE 3200
REBECCA 01-JAN-67 01-DEC-90 F BASIC COBOL 2500
REMITHA 19-APR-70 20-APR-93 F C ASSEMBLY 3600
REVATHI 02-DEC-69 02-JAN-92 F PASCAL BASIC 3700
VIJAYA 14-DEC-65 02-MAY-92 F FOXPRO C 3500
and title of this question is my question. How can i get the info. Please tell me with simple logic and efficient query.
I am enjoying sql queries...

Answer 1

IF OBJECT_ID('dbo.[test]','U') IS NOT NULL
DROP TABLE [dbo].[test]
CREATE TABLE [dbo].[test](
[PNAME] [varchar](10) NULL,
[DOB] [date] NULL,
[DOJ] [date] NULL,
[GENDER] [char](1) NULL,
[PROF1] [varchar](30) NULL,
[PROF2] [varchar](30) NULL,
[SALARY] [decimal](8, 2) NULL
INSERT [dbo].[test] ([PNAME], [DOB], [DOJ], [GENDER], [PROF1], [PROF2], [SALARY]) VALUES
(N'ANAND', '1966-04-12', '1992-04-21', N'M', N'PASCAL', N'BASIC', CAST(3200.00 AS Decimal(8, 2)))
, (N'ALTAF', '1964-07-02', '1990-11-13', N'M', N'CLIPPER', N'COBOL', CAST(2800.00 AS Decimal(8, 2)))
, (N'JULIANA', '1960-01-31', '1990-04-21', N'F', N'COBOL', N'DBASE', CAST(3000.00 AS Decimal(8, 2)))
, (N'KAMALA', '1968-10-30', '1992-01-02', N'F', N'C', N'DBASE', CAST(2900.00 AS Decimal(8, 2)))
, (N'MARY', '1970-06-24', '1991-02-01', N'F', N'CPP', N'ORACLE', CAST(4500.00 AS Decimal(8, 2)))
, (N'NELSON', '1965-09-11', '1989-10-11', N'M', N'COBOL', N'DBASE', CAST(2500.00 AS Decimal(8, 2)))
, (N'PATTRICK', '1965-11-10', '1990-04-21', N'M', N'PASCAL', N'CLIPPER', CAST(2800.00 AS Decimal(8, 2)))
, (N'QADIR', '1965-08-31', '1991-04-21', N'M', N'ASSEMBLY', N'C', CAST(3000.00 AS Decimal(8, 2)))
, (N'RAMESH', '1967-05-03', '1991-02-28', N'M', N'PASCAL', N'DBASE', CAST(3200.00 AS Decimal(8, 2)))
, (N'REBECCA', '1967-01-01', '1990-12-01', N'F', N'BASIC', N'COBOL', CAST(2500.00 AS Decimal(8, 2)))
, (N'REMITHA', '1970-04-19', '1993-04-20', N'F', N'C', N'ASSEMBLY', CAST(3600.00 AS Decimal(8, 2)))
, (N'REVATHI', '1969-12-02', '1992-01-02', N'F', N'PASCAL', N'BASIC', CAST(3700.00 AS Decimal(8, 2)))
, (N'VIJAYA', '1965-12-14', '1992-05-02', N'F', N'FOXPRO', N'C', CAST(3500.00 AS Decimal(8, 2)))
;with mycte as (
select PNAME,DOB, DOJ,GENDER,SALARY, count(PNAME) Over(partition by PROFs) cnt
FROM test t
CROSS APPLY (VALUES(PROF1),(PROF2))p(PROFs) )
Select PNAME,DOB, DOJ,GENDER,SALARY FROM mycte
WHERE cnt=1