# Nested Loop Joins Algorithm Assignment Help

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## Algorithm:

An algorithm is a methodical approach for solving a problem.

For Example:

1) The algorithm to multiply "A" by "B" is to add "A" to itself "B" times.

2) The algorithm to compute the average of "N" number is to add them up and then divide by "N".

### What is Nested Loop Joins algorithm?

 Nested loopjoinfor each tuple ‘tr’in‘r’{for each tuple ‘ts’in‘s’{if (‘tr’and‘ts’ satisfy the join condition ‘0’){add tuple( tr*ts)to the result set } }}

1) A nested loop join with the outer relation r and the inner relation s can be used to compute a theta join

2) The nested loop join algorithm requires no indices and can be used for any join condition

3) A nested loop join is expensive since every pair of tuples in the two relations has to be examined.

 Tuple-based nested loopjoinalgorithm:FOR each tuple ‘s’in‘S’ DOFor each tuple ‘r’in‘R’ DoIF ‘r’and‘s’jointo make a tuple ‘t’THEN output t;

Properties of Algorithms

1. Specified Output
2. Definiteness
3. Specified Input
4. Effectiveness
5. Finiteness

Some of the popular methodologies are:

1. Deterministic or non-deterministic
2. Divide and conquer method
3. The greedy method
4. Dynamic programming
5. Linear programming
6. Reduction of complexity
7. Randomized algorithm
8. Search and enumeration
9. Exact or approximate
10. Logical
11. Deterministic or non-deterministic
12. Serial, parallel or distributed

### Black based nested loops:

1. Assume B(S) <= B(R), and B(S) > M
2. Read M-1 blocks of S into Main memory and compare to all of R, block by block

 For each chunk b of R DOFOR each block  b of R DO  FOR each tuple t of b DO  Find the tuples of S in memory that joinwith tOutput the joinof t with each of these tuples

Example: Black Based Nested Loops