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Which of the following statements are TRUE about an SQL query? P: An SQL query can contain a HAVING clause even if it does not have a GROUP BY clause Q: An SQL query can contain a HAVING clause only if it has a GROUP BY clause R: All attributes used in the GROUP BY clause must appear in the SELECT clause S: Not all attributes used in the GROUP BY clause need to appear in the SELECT clause
P, Q, R, S and T are sitting in a row. T is not beside R. S is not beside P. Q is beside P. T is not beside S. There order will be:
Assume that multiplying a matrix G1 of dimension ? × ? with another matrix G2 of dimension ? × ? requires ??? scalar multiplications. Computing the product of n matrices G1G2G3…Gn can be done by parenthesizing in different ways. Define Gi Gi+1 as an explicitly computed pair for a given paranthesization if they are directly multiplied. For example, in the matrix multiplication chain G1G2G3G4G5G6 using parenthesization (G1(G2G3))(G4(G5G6)), G2G3 and G5G6 are the only explicitly computed pairs.Consider a matrix multiplication chain F1F2F3F4F5, where matrices F1, F2, F3, F4 and F5 are of dimensions 2 × 25, 25 × 3, 3 × 16, 16 × 1 and 1 × 1000, respectively. In the parenthesization of F1F2F3F4F5 that minimizes the total number of scalar multiplications, the explicitly computed pairs is/are
If we specify multiple relations in the from clause and do not specify any conditions in the where clause, what will the result be?
Six students, A, B, C, D, E and F, are standing facing north. They are not standing in alphabetical order, A is at one corner and F is beside him. B is to the immediate right of E. B is at the second place from the right end. C is not beside F. Who is standing at the right end?
Six students, A, B, C, D, E and F, are standing facing north, but not necessarily in the same sequence. A is at one of the corners and F is beside him. B is to the immediate right of E. B is at the second place from the right end. C is not beside F. Who is standing third from the right side?
Six students, L, M, N, O, P and Q, are standing facing north, but not necessarily in the same sequence. L is at one of the corners and Q is beside him. M is to the immediate right of P. M is at the second place from the right end. N is not beside Q. Who is standing to the immediate right of Q?
Six students, A, B, C, D, E and F, are standing facing north, but not necessarily in the same sequence. A is at one corner and F is beside him. B is to the immediate right of E. B is at the second place from the right end. C is not beside F. Who is standing at the left end? 
Six students A, B, C, D, E and F are standing facing north but not necessarily in the same sequence. A is at one of the corners and F is beside him. B is to the immediate right of E. B is second from the right end. C is not beside F. Who is standing third from the left?
Consider the following statements regarding removal of impurities from water: 1. Settleable solids are removed by filtration. 2. Volatile solids are removed through sedimentation. 3. Dissolved solids are removed through reverse osmosis. 4. Colloidal solids are removed by coagulation. Which of the above statements are correct?