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Case studies and SQL questions
I applied via campus placement at Indian Institute of Technology (IIT), Roorkee and was interviewed in Dec 2021. There were 4 interview rounds.
Normal aptitude test. Test format was some what like cat paper. Maths and reasoning was asked. Fast calculation and practice us required for solving all the problema under given time
Inner join returns only the matching records from both tables, while outer join returns all records from both tables.
Inner join combines rows from two tables based on a related column.
Outer join combines rows from two tables and includes unmatched rows from one or both tables.
Inner join is used to retrieve data that exists in both tables.
Outer join is used to retrieve data that may or may not exist in both tables.
Examp...
Inner join of two tables with 5 and 3 entries can result in a minimum of 0 and a maximum of 3 entries.
Inner join returns only the matching rows from both tables.
The maximum number of entries in the result will be equal to the number of matching rows.
If there are no matching rows, the result will have 0 entries.
In this case, the maximum number of entries will be 3, as there can be at most 3 matching rows.
Tuple and list are two data structures in Python with different properties.
Tuple is immutable while list is mutable
Tuple uses () while list uses []
Tuple is faster than list for accessing elements
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