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in Database Management System by (30.5k points)
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A table with three columns is given below. For each relational operation given in the 1st column find the best matches from 2nd and 3rd columns.

   Operation   Symbol Feature
1. Select (a)  ∩ (i) Output will be only those rows in the first operand table that are not in the second operand
2. Union (b) -(minus) (ii) Gives the horizontal subset of the operand table.
3. Set Difference (c) σ(sigma)
(d) ∪
(iii) Gives a table that contains all rows of the operand tables.
(iv) Gives the vertical subset of the operand table.

1 Answer

+1 vote
by (30.3k points)
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Best answer

1. Select → c) σ → (ii) 

2. Union → d) ∪ → (iv) 

3. Set difference → b) → (i)

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