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SELECT "Isosceles" from TRIANGLES where ( ((A = B) or (A = C) or (C = B) ) and not ( A = B and A = C ) and not (( (A + B) < C ) or ( (C + B) < A ) or ( (C + A) < B )) );

SELECT "Equilateral" from TRIANGLES where ( A = B and A = C );

SELECT "Scalene" from TRIANGLES where ( ((A <> B) and (A <> C) and ( B <> C )) and not (( (A + B) < C ) or ( (C + B) < A ) or ( (C + A) < B )) );

SELECT "Not A Triangle" from TRIANGLES where (( (A + B) < C ) or ( (C + B) < A ) or ( (C + A) < B ));

Why does it says wrong answer ??

or this

CASE
WHEN (((A = B) or (A = C) or (C = B) ) and not ( A = B and A = C ) and not (( (A + B) < C ) or ( (C + B) < A ) or ( (C + A) < B ))) THEN SELECT "Isosceles";
WHEN ( A = B and A = C ) THEN SELECT "Isosceles";
WHEN (((A <> B) and (A <> C) and ( B <> C )) and not (( (A + B) < C ) or ( (C + B) < A ) or ( (C + A) < B ))) THEN SELECT "Scalene";
WHEN (( (A + B) < C ) or ( (C + B) < A ) or ( (C + A) < B )) THEN SELECT "Not A Triangle";
END CASE

I think you need to read about UNION for the first, the second the CASE should live inside the SELECT not the other way around. I've never seen it the other way around

## Type of Triangle

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SELECT "Isosceles" from TRIANGLES where ( ((A = B) or (A = C) or (C = B) ) and not ( A = B and A = C ) and not (( (A + B) < C ) or ( (C + B) < A ) or ( (C + A) < B )) );

SELECT "Equilateral" from TRIANGLES where ( A = B and A = C );

SELECT "Scalene" from TRIANGLES where ( ((A <> B) and (A <> C) and ( B <> C )) and not (( (A + B) < C ) or ( (C + B) < A ) or ( (C + A) < B )) );

SELECT "Not A Triangle" from TRIANGLES where (( (A + B) < C ) or ( (C + B) < A ) or ( (C + A) < B ));

Why does it says wrong answer ??

or this

CASE WHEN (((A = B) or (A = C) or (C = B) ) and not ( A = B and A = C ) and not (( (A + B) < C ) or ( (C + B) < A ) or ( (C + A) < B ))) THEN SELECT "Isosceles"; WHEN ( A = B and A = C ) THEN SELECT "Isosceles"; WHEN (((A <> B) and (A <> C) and ( B <> C )) and not (( (A + B) < C ) or ( (C + B) < A ) or ( (C + A) < B ))) THEN SELECT "Scalene"; WHEN (( (A + B) < C ) or ( (C + B) < A ) or ( (C + A) < B )) THEN SELECT "Not A Triangle"; END CASE

I think you need to read about UNION for the first, the second the CASE should live inside the SELECT not the other way around. I've never seen it the other way around