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SQL Interview Success: Unlocking the Top 5 Frequently Asked Queries

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 Here are the five top commonly asked SQL queries in the interviews. These you can expect in Data Analyst, or, Data Engineer interviews. Top SQL Queries for Interviews 01. Joins The commonly asked question pertains to providing two tables, determining the number of rows that will return on various join types, and the resultant. Table1 -------- id ---- 1 1 2 3 Table2 -------- id ---- 1 3 1 NULL Output ------- Inner join --------------- 5 rows will return The result will be: =============== 1  1 1   1 1   1 1    1 3    3 02. Substring and Concat Here, we need to write an SQL query to make the upper case of the first letter and the small case of the remaining letter. Table1 ------ ename ===== raJu venKat kRIshna Solution: ========== SELECT CONCAT(UPPER(SUBSTRING(name, 1, 1)), LOWER(SUBSTRING(name, 2))) AS capitalized_name FROM Table1; 03. Case statement SQL Query ========= SELECT Code1, Code2,      CASE         WHEN Code1 = 'A' AND Code2 = 'AA' THEN "A" | "A
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Python Delete Duplicates in List Faster Way

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Removing duplicates in List simplified using SET method. It's a simple method. Just you need SET and Print to remove duplicates. Removing duplicates is common in Data science projects.

What is list

A list is a collection of elements. The elements can be duplicates or non-duplicates. Today's task is to remove duplicate elements in the List.


Faster way to remove list duplicates

Faster way to remove list duplicates

  • Create a List
  • Use SET
  • Print the result


List with duplicates

my_list = ['The', 'unanimous', 'Declaration', 'of', 'the', 'thirteen','united', 'States', 'of', 'America,', 'When', 'in', 'the', 'Course', 'of', 'human']



Apply set method

>>> non_dupes = set(my_list)



Print Final list

>>> print(non_dupes)



Here, if you observe, there are no duplicates. The duplicates are now removed. It displays only non-duplicate values. 


get rid of duplicates list python


Here 'the' is a duplicate value. That's now removed.

11 top list methods

  1. Append
  2. Extend
  3. Insert
  4. Remove
  5. pop
  6. clear
  7. Index
  8. Count
  9. Sort
  10. Reverse
  11. Copy

Details of List Methods


Append

Adds an item at the end of the list.

Extend

Extends the list by adding all the items.

Insert

Inserts an item at a specified location.

Remove

Removes an item from the list. If there are no items, it gives a value error.

pop

Remove the item at the given position in the list, and return it. If no index is specified, a.pop() removes and returns the last item in the list.


Clear

It removes all the items from the list.

Index

It gets an index for the given value. The index starts from '0'.


Count

It returns the of times a particular value appears.

Sort

It sorts the items.


Reverse

Reverses the items in the list.

Copy

Return a shallow copy of the list.

References

Comments

  1. high technologies solutionsJune 25, 2021 at 10:45 AM

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